Summary of recent Standard Model measurements performed by ATLAS and CMS experiments at LHC (CERN).
Review of recent heavy flavour results obtained by the ATLAS and CMS collaborations
will be presented. The results will be compared with those from other experiments
and with theoretical predictions. Prospects for further studies
will also be outlined
The development of the GAMMA-400 gamma-ray telescope for cosmophysical research continues under the Russian Federal Space Program. The GAMMA-400 experiment will be implemented aboard the Russian astrophysical space observatory, which will be operating in a highly elliptic orbit during 7 years to provide new data on gamma-ray emission and cosmic-ray electron + positron fluxes mainly from the...
We first analize the effects of an electric field on the effective potential in a self interacting scalar theory, finding electric anticatalysis in the weak field region, i.e. a critical temperature that diminishes as function of the intensity of the electric field. The physical situation corresponds to collision between heavy and a light nuclei, for example Au-Cu collision, where due to the...
Cosmic rays are highly energetic particles emitted from different galactic and extragalactic sources.These primary particles propagate through interstellar space until they reach the Earth's atmosphere. The number of particles detected on the surface of Earth is not the same depending on the direction viewed in the sky, it varies with the zenith angle. In this work, we calculate the angular...
Astrophysical radio experiments in Antarctica and Greenland are designed to search for neutrinos with ultra high energies. The method of their detection is based on the search for Askaryan radio pulses emitted by showers from the interaction of neutrinos in ice. For these experiments, it is important to know what pulsed radio noise may be present in order to distinguish them from rare neutrino...
The upcoming LHCb calorimetry upgrade, aimed to allow LHCb detectors to operate with higher luminosity, implies significant hardware modifications to the present ECAL. These changes include replacement of the current shashlik-type modules with spaghetti-type for the inner part, upgrade of the shashlik modules to improve time resolution and possible removal/modification of the HCAL (Hadron...
The PAMELA electromagnetic calorimeter consists of 44 single-sided silicon sensor planes interleaved with 22 plates of tungsten absorber. It provides a comprehensive information about spatial development of hadronic showers, and about deposited energy amount.
In this work, Monte Carlo simulations (based on Geant4) performed using different available models, including Fritiof (FTF) and Quark...
The angular distributions for the 11.28 (7/2+), 11.82 (9/2-), and 13.79 (7/2-) MeV states were obtained and analyzed from the scattering of light particles by the 9Be nucleus.[1,2]. The MDM method was used to estimate the radii [3]. The resulting diffraction radius of the 11.82 MeV state turned out to be equal to the radius of the ground state. This indicates that the root-mean-square radius...
The current level of development of experimental facilities makes it possible to conduct studies of both relatively long-lived nuclei forming the valley of stability and exotic nuclei lying outside this region. The production of exotic nuclei is a rather difficult task, one of the solutions of which was the using radioactive isotopes beams accelerated to energies above the Coulomb interaction...
One of the most actual questions of particle physics and cosmology today is the nature of Dark Matter. Experiments on the direct search for dark matter particles are aimed to direct detection of Weakly Interaction Massive Particles (WIMP) or obtaining constraints on their space of mass parameters and spin-independent interaction cross sections.
For WIMPs (from a few GeV/c$^2$ to TeV/c$^2$)...
Neutrinoless double beta decay search is one of the most significant tasks in nuclear and elementary particle physics. The detection of this process will provide information on such fundamental issues as the absolute neutrino mass scale, the type of neutrino hierarchy (normal or inverse), and violation of CP parity in the lepton sector. One of the supposed options is a process involving the...
The study of the thermonuclear reaction rates of neutrino production in the primordial hot region is essential for understanding primordial nucleosynthesis in regions formed by primordial density inhomogeneities. We considered the thermonuclear reaction rates due to effects of electron-positron annihilation, reactions of weak proton-neutron transitions, and the production of light nuclides...
The aim of the present work was to measure the yield ratios of the 85m,gSr produced in the natSr(γ,xn) reactions with bremsstrahlung end-point energy 55 MeV. The study examined the possibility of producing 85Sr isotope in photonuclear reactions on a natural mixture of strontium isotopes. The radionuclide 85Sr has decay parameters such as half-life and photon energies suitable for the nuclear...
We obtain kink solutions for a family of field-theoretic models with polynomial self-interaction of a real scalar field. These solutions have power-law asymptotics, and hence can be used for modelling of the so-called thick domain walls (among other applications). We also study various properties of the obtained solutions.
At the Baksan Neutrino Observatory deployed in the North Caucasus mountains, it is proposed to develop, at a depth corresponding to about 4700 mwe, a large-volume neutrino detector based on a liquid scintillator with a target mass of 10 kt. The main physics goals of the detector are low-energy neutrino physics, astrophysics and geophysics. The highest possible light yield is crucial for such...
In addition to classical analytical data processing methods, machine learning methods are widely used for data analysis in elementary particle physics. Most often such techniques are used to identify a particular class of events (the classification problem) or to predict a certain event parameter (the regression problem). Here we present the result of using a machine learning model to solve...
The electroweak production of $Z(\nu\bar{\nu})\gamma$ in association with two jets is studied in a regime with a photon of high transverse momentum above 150 GeV using proton--proton collisions at centre-of-mass energy of 13 TeV at the Large Hadron Collider. The analysis uses a data sample with an integrated luminosity of 139 fb$^{-1}$ collected by the ATLAS detector during the 2015--2018 LHC...
An excess of positrons in cosmic rays (CR) called positron anomaly was discovered more than decade ago and still stays an open-ended question in astrophysics. There is a big group of models involving annihilating or decaying Dark Matter (DM) purported to explain the anomaly. But they face an obstacle in the form of gamma-rays. Simple DM models tend to overproduce gamma-rays, leading to...
Models of the origin of astrophysical neutrinos with energies from TeVs to PeVs are strongly
constrained by multimessenger observations and population studies. Recent results point to statis-
tically significant associations between these neutrinos and active galactic nuclei (AGN) selected
by their radio flux observed with very-long-baseline interferometry (VLBI). This suggests that...
To improve the sensitivity to CP violation, reduce systematic uncertainties, T2K launched an intensive upgrade program that includes the upgrade of the near neutrino detector ND280. A novel 3D highly granular scintillator detector, called SuperFGD, of a mass of about 2 tons will have the full polar angle coverage for charged particles produced in neutrino interaction, a low threshold...
The Noble Element Simulation Technique (NEST) is a C++ package with optional GEANT4 integration and a Python equivalent (nestpy) developed for liquid noble gases experiments. It is capable of accurate predictions of scintillation and ionization signal from different particles for a large range of drift fields in liquid xenon and argon and is widely used by leading dark matter and neutrino...
We obtain estimates for the kink-antikink force of interaction. We consider the case of kinks with power-law asymptotics, which is used, in particular, to model thick domain walls. We use a method based on a special type of field approximation between a kink and an antikink.
The BM@N (Baryonic Matter at Nuclotron) is the first running experiment at the NICA accelerator complex and is aimed at studying the QCD diagram at high baryon densities. The forward detectors of the BM@N experiment are the forward hadron calorimeter, scintillation wall and quartz hodoscope. The forward detectors are used to determine the centrality and orientation of the reaction plane, and...
The DarkSide-20k (DS-20k) experiment seeks to directly detect dark matter in the form of weakly interacting massive particles (WIMPs). DS-20k is a two-phase liquid argon (LAr) Time Projection Chamber (TPC) with an active volume of 50 tonnes, which is built in the Outer Veto. The Outer Veto is approximately 650 tonnes of atmospheric argon (AAr) in a membrane cryostat, designed to veto...
At present, production, properties, and decays of heavy baryons are intensively studied both experimentally and theoretically. The $SU(3)$ flavor symmetry allows an existence of a large number of hidden charm pentaquark states which differ in their light quark content. Here, ratios of weak decay width of bottom baryons into a pentaquark and light meson are presented. The most interesting for...
The method of induced activity was used to study photonuclear reactions on a natural mixture of selenium isotopes. This study measured the yields of the radionuclides 73(m+g)Se, 75Se, 79mSe, 81(m+g)Se, 71As, 72As, 74As, 76As, 77As, 78As, and 79As produced in natSe(γ, xnyp) multiparticle reactions with bremsstrahlung end-point energy of 55 MeV. The bremsstrahlung radiation was generated using...
Project of a compact muon hodoscope for muonography of various objects.
Tselinenko M. Yu.1, Kompaniets K. G1, Pasiuk N. A.1, Shutenko V.V.1, Yashin I. I.1
1NRNU MEPhI, Russia, Moscow, MYTselinenko@mephi.ru
Report Type: Poster.
At present, the method of muonography (by analogy with X-ray diffraction radiography) of the internal structure of various natural and artificial objects using the...
Rare decay process of the Higgs boson into a pair of $J/\Psi$ and a pair of $\Upsilon$ mesons is studied within perturbative Standard Model and relativistic quark model. Relativistic corrections to the production amplitudes, connected with the relative motion of heavy quarks, are calculated. Different decay mechanisms are studied. Numerical values of the decay widths of the Higgs boson are...
The Jacobson have shown that Gravity force is not fundamental phenomenon and one able to consider it as emergent one. According to his idea, gravity is only the first law of thermodynamics of space-time. The next step in this direction was forwarded by Verlinde whom argued that gravity is not fundamental force and can be interpreted as the entropic force due to changing of entropy associated...
Liquid scintillators have always been an important part of many experiments in neutrino physics. Currently, the so called “standard” liquid scintillator consisting of linear alkylbenzene (LAB), 2,5-diphenyloxazole (PPO) and 1,4-Bis(2-methylstyryl)benzene (bis -MSB) is used in many experiments. As an alternative to the “standard” LAB-based liquid scintillator, a new highly efficient liquid...
A central goal of current relativistic heavy-ion experiments is to study the properties of the hot and dense QCD matter. Anisotropic flow measurements of identified particles play an essential role in the constraining transport coefficients of the strongly-coupled Quark Gluon Plasma (sQGP) and studies providing better insight to the QGP phase diagramm.
We report on the results of the recent...
Level structure of heavy helium isotope $^{9,10}$He is studied in the reactions of stopped pion absorption $^{14}$C($\pi^-$, p$^4$Нe )X, $^{14}$C($\pi^-$,d$^3$Нe)X, $^{14}$C($\pi^-$,p$^3$Нe)X. The experiment was carried out at the LANL with a two-arm semiconductor spectrometer. The ground and excited states of $^9$He have been observed. The E$_x \approx$ 11 MeV state of $^9$He has been...
A promising way of studying properties of distant objects and transient sources in the Universe is exploring neutrino coming from that sources. Such transients as Fast Radio Bursts (FRB) are of particular interest for astroparticle physics. FRB is a millisecond radio transient observed at extragalactic or cosmological distance. Numerous models with a wide variety of physical processes have...
The paper presents the methodology and analysis of experimental data obtained by a Large Volume Detector (LVD) located in the Gran Sasso Laboratory. For 30 years of the experiment, a large database has been collected, on the basis of which a limit has been set on the frequency of supernova explosions in the Galaxy.
A gaseous beam monitor is being developed for the CSR external-target experiment (CEE) at HIRFL. The requirements on the beam particle rate of up to $10^{6}$ pps and the per-particle position resolution of better than 50 $\mu$m pose challenge on the detector design. The beam monitor mainly consists of two drift chambers, each measuring a 1D position of the beam particle transverse to the beam...
The LHC Phase II Upgrade foreseen for 2026 implies multi fold increasing of number of collisions and radiation levels compared to the present LHC conditions. The electromagnetic calorimeter (ECAL) of LHCb experiment requires modernisation due to enlarged radiation doses and high occupancy: replacing shashlik-type modules for the central part by spaghetti-type (SPACAL) calorimeter. Current...
In the early stages of the core-collapse supernova a prominent amount of neutrinos is emitted in a short burst on a ~10s time scale.
Since the neutrinos can escape the medium of the collapsing star without interaction, such signal can be detected by the neutrino experiments several hours before the observable optical signals.
SuperNova Early Warning System (SNEWS) is an international network...
The study of the proton transfer process during the interaction of accelerated nuclei with light nuclei near the Coulomb barrier is of great interest for astrophysics, since the information obtained from the analysis of such reactions makes it possible to estimate the astrophysical S-factors of the radiative capture of protons at very low energies, where direct measurements are impossible.
For...
The iDREAM (industrial Detector of Reactor Antineutrinos for Monitoring) has been developed as a prototype of the industrial detector for development reactor monitoring methods. The detector has been installed and commissioned at Kalinin NPP (Russia) at 20 m from the 3 GWth reactor core (third unit). The detector is a scintillator spectrometer. The calibration measurements play a crucial role...
The d+d reaction is very well suited for calibration due to the 2.45 MeV fast neutron reaction channel. Due to this circumstance, the d+d neutron generator is considered as one of the promising tools for calibrating low-background neutrino and dark matter detectors [1]. The current status of the development of a compact neutron generator is presented. The generator includes the elements of the...
We consider the interaction of particles with domain walls in the early Universe. The domain wall is a topological soliton of a scalar field. We obtain quantitative estimates for transmission and reflection coefficients using various approximate expressions for the effective potential of interaction.
The background induced by misidentification of a jet as a photon ($jet\rightarrow\gamma$) is usually estimated using two-dimensional sideband method (ABCD-method) in collider experiments. This report is devoted to an alternative "slice method" of the estimation based on likelihood fit of $jet\rightarrow\gamma$, signal and other background yields using kinematic distributions in a phase-space...
The problem of dark matter particle search is at the frontier of the modern physics. The scenario of composite dark matter, in which hypothetical, stable, lepton-like particles X having a charge - 2n, where n is any natural number, and forming neutral atom-like states of X-helium with primary helium nuclei, called "dark" atoms, offer a solution to the problem of direct searches for dark matter...
The spatial parity (P) violation in strong interactions have never been observed experimentally. One can include a P-breaking term in the QCD lagrangian. Thus, there can be a local violation of P-symmetry in the medium with hight temperature and large topological fluctuations [1]. As a consequence, some hadrons would decay in channels that forbidden by the global parity conservation [2]. In...
The binary black hole coalescences GW150914 and GW151226 observed by the LIGO enabled us to investigate gravity in the strong-field regime. In the formation models, including isolated binary stars, there are still many open questions about the sustainability of mass transfer and common envelope evolution. The gravitational wave (GW) sources have been predicted using extensive binary population...
The aim of the poster is to demonstrate status of the work in estimation of NA62 [1] experiment sensitivity towards the search for forbidden decay $\pi^{0}\rightarrow3\gamma$ and rare decay $\pi^{0}\rightarrow4\gamma$. Current branching-ratio upper limit is $3.1\times10^{-8}\:(90\%\;\textrm{C.L.})$ for the $\pi^{0}\rightarrow3\gamma$ decay and $2\times10^{-8}\:(90\%\;\textrm{C.L.})$ for...
The report focuses on studying the semiclassical limit in the case of a closed isotropic model with a scalar field, decomposed into modes. The calculations are made within frameworks of two approaches. The first is the Wheeler-DeWitt quantum geometrodynamics, and the second is the extended phase space approach, that is known to be gauge dependent. The work is aimed in comparing results,...
Ultra-high energy cosmic rays (UHECR) can be produced in active galaxies, and directional correlations between them were studied extensively. One puzzling result was the correlations of arrival directions of UHECR and a particular class of active galactic nuclei, BL Lacertae type objects, discovered in 2004 with the HiRes stereo data set [1,2]. If confirmed, this result would definitely mean...
Higher-order QCD predictions of charge asymmetry distributions are presented for inclusive W±+X→l±ν+X production in proton-proton (pp) collisions at 8, 13, and 14 TeV center-of-mass energies. The W boson or the decay lepton charge asymmetries constitute a direct probe of the relative u and d quark distributions in the proton as functions of the initial-state parton momentum fractions. The...
The size of a nucleus defined by the radius of its nucleon (proton and neutron) density distribution and the proton charge distribution is one of the most fundamental and important nuclear characteristics. Nuclear radius determines the basic properties of nuclei and is a consequence of the fundamental features of the strong interaction.
The development of methods of measuring the radii of...
A short introduction to Weyl geometry and Weyl gravity is given. The self-consistency relation for the variation of the general form of the matter action integral to be conformal invariant is obtained. It is shown that the particle production rate per unit coordinate volume per unit coordinate time is conformal invariant. It is noticed that such a feature allows us to consider the perfect...
In our previous publications [1–4] we discussed various manifestations of a new decay channel of the low excited heavy nuclei called collinear cluster tri-partition (CCT). In the frame of the essentially modified experimental method, additional linear structures corresponding to the relations M1 + M2 = const and M1 – M2 = const for the masses M1 and M2 of the fission fragments (FFs) from...
The NA64 experiment is a fixed-target experiment at the CERN SPS combining the active beam dump and missing energy techniques to search for rare events by colliding 100-150 GeV energy electron or muon beams onto an active target.
The talk presents the muon part of the experiment. The NA64-mu looks for the muon (g-2) anomaly and light dark matter with the semi-visible dark photon channel. The...
The geodesic deviation equation
$\frac{D^2\xi^{\mu}}{d\tau^2}=R^{\mu}_{.\nu\alpha\beta}u^{\nu}u^{\alpha}\xi^{\beta}$, where $u^\mu$ is 4-velocity vector tangent to geodesic and $\xi^\mu$ is geodesic deviation vector, which connects two points corresponding to the same value of the affine parameter $\tau$ on two close geodesics, was studied in multidimensional Tangherlini spacetime with line...
We investigate nonlinear response of the physical vacuum by the example of the third harmonic in radiation of the electron-positron-photon (EPP) plasma exciting by a strong time dependent electric field at the focus spot of counterpropagating laser pulses. The investigation was developed within the framework of the Bogoliubov-Born-Green-Kirkwood-Yvon kinetic theory [1,2] describing...
The Higgs boson in its vector boson fusion production mode and its decay to a pair of W bosons that in turn decay leptonically to a eνμν final state, is probed. The Large Hadron Collider delivered proton-proton collisions at a center-of-mass energy of 13 TeV between 2015 and 2018 which were recorded by the ATLAS detector, corresponding to an integrated luminosity of 139 fb−1. Deep Neural...
This work presents the results of single and double charge exchange reactions measuring in the fragmentation of carbon ions at the energy of 300 MeV/nucleon. Experimental data were collected at the FRAGM facility and the ITEP-TWAC multi-purpose accelerator complex on a thin beryllium target [1, 2]. The search was made for the following set of isotopes that carried out with nucleon charge...
The question about the appearance of time in the semiclassical limit of quantum gravity continues to be discussed in the literature. It is believed that a temporal Schrödinger equation for matter fields on the background of a classical gravitational field must be true. To obtain this equation, the Born – Oppenheimer approximation for gravity is used. However, the origin of time in this...
A successful compactification scenario should explain two, in principle, rather different properties of the multidimensional space-time. First, we need to show why the evolution of three big dimension is different from the evolution of other dimensions. Second, we need to explain why the 3-dimension subspace is almost isotropic one. We present a scenario which address both issures. Starting...
Results of a search for hidden patterns in the behavior of the 214Po half-life solar-daily variation parameters obtained in the data collected in the 2012 – 2015 years are presented. It is shown that amplitude of the sine curve approximated a half-life solar-daily dependence obtained for an each season of the year by an averaging through 90 days could reach 3.3∙10-3 from the daily averaged...
Higgs boson production via gluon-gluon fusion in proton-proton collisions is measured in the H→WW∗→eνμν decay channel. The utilized dataset is the √s=13 TeV proton-proton collision data collected by the ATLAS experiment during Run 2 of the Large Hadron Collider with an integrated luminosity of 139 fb−1. The total cross section for Higgs boson production by gluon-gluon fusion times the H→WW∗...
We consider $f(R)$ gravity model with an additional function of the Gauss-Bonnet term.
We analyze the model in slow-roll regime and estimate inflationary parameters using observational
data to restrict parameters including to the function of the Gauss-Bonnet term.
The formation of the unbound heavy helium isotopes 7,9He was studied in the reactions of stopped pion absorption by light nuclei. The ground and excited states were observed in the following channels: 9Be(pion-,d)7He, 11B(pion-,pt)7He, 10B(pion-,pd)7He, 11B(pion-,pt)7He, 10B(pion-,dd)7He, 12C(pion-,p4He)7He, 12C(pion-,d3He)7He, 14C(pion-,t4He)7He and 11B(pion-,pp)9He, 14C(pion-,p4He)9He,...
We consider dynamics of the massive minimally coupled scalar field theory in an expanding Friedmann-Lemaitre-Robertson-Walker universe. We consider the standard toy model of the conformally flat space-time where the conformal factor becomes constant at the distant past and the distant future. Employing Schwinger-Keldysh diagrammatic technique, we compute infrared loop corrections to the...
The search for anomalous couplings is an indirect model-independent way to find deviations from the Standard Model (SM). Effective field theory allows to parameterize these anomalous couplings in the Lagrangian, respecting the SM gauge symmetries, using operators of higher dimensions constructed from the SM fields. In the classical way of setting the limits on the operators (Wilson)...
Probably, physics of particles must consist of two parts. Low energy -standard model. High energy > $\ 10^{5}$ GeV - the early Universe.The first step to modernization of Standard model is insertion of quarks with electric charges q=$-\frac{2}{3}$ and q=$\frac {1}{3}$ in its high energy part. During baryon genesis has deternined the quark composition of protons and neutrons.Baryon genesis was...
On behalf of BSTU-PhIAN-INF collaboration
Possible temporal variations of nucleus decay parameters were studied extensively in the last years, their observation can be the signal of unknown physical effects. Several experiments reported the annual and daily decay rate oscillations in alpha and beta-decays of some radioactive nuclides at the level of .05 % [1,2]. Also, correlation of ...
A search for dark matter particles is performed using events with a Z boson candidate and large missing transverse momentum. The analysis is based on proton-proton collision data at a center-of-mass energy of 13 TeV, collected by the CMS experiment at the LHC in 2016-2018, corresponding to an integrated luminosity of 137 fb$^{−1}$. The search uses the decay channels Z → ee and Z → μμ. No...
Cluster structure plays an important role in nuclei, in particular, in light ones. One of the common types of clusters is the α-particle. Consisting of four nucleons, the alpha particle is tightly bound and has no excited state up to 20 MeV and behaves as a well-established subunit in nuclei.
Considerable attention has been drawn to the studies of $\alpha$-cluster states in $^{12}$C,...
The lowest order radiative corrections to the lepton current in polarized SIDIS are calculated exactly. The contribution of exclusive radiative tail for polarized initial particles are estimated for the first time. Numerical analysis is performed in the frame of the modern JLab kinematic conditions within Wandzura-Wilczek model for SiDIS structure functions and the exclusive radiative tail is...
The mass distributions of 252Cf(sf) ternary fission fragments with the emission of a light charged particle are measured. The experiment was carried out on a modernized COMETA time-of-flight spectrometer consisting of 28 silicon pin diodes with a thin input window and a starting detector based on microchannel plates. The threshold for the measured particle energy was ~1 MeV. The mass...
We discuss a limits on a hidden sector models, which have been excluded recently by NA64e that is the electron fixed-target experiment at CERN SPS. Namely, new experimental bounds on Dark Photon, millicharged fermions and axion-like particles are obtained from the missing energy signatures of the electron beam incident on a lead target of NA64e.
Free particles carrying orbital angular momentum (OAM) are called twisted particles. The wave function of such particles has a characteristic phase $e^{i l\varphi}$, where $l$ is the OAM projection onto the axis along the particle motion and $\varphi$ is the azimuth angle of a point of a wave packet in the cylindrical system of coordinates. The twisted neutrons have been obtained relatively...
The BECQUEREL experiment is aimed at solving topical problems in nuclear clustering physics [1]. The used method of nuclear track emulsion (NTE) makes it possible, due to its unique sensitivity and spatial resolution, to study by means of the unified approach multiple final states arising in dissociation of relativistic nuclei. Currently, the research has been focused on the theoretical...
An overview of GBAR experiment in CERN on antihydrogen gravitational mass measurement is given. The use of interference of gravitational quantum states of antihydrogen in the field of the Earth is discussed in view of precision measurement of gravitational mass of antihydrogen.
At the present state-of-the-art, the simplest inflationary models, based either on scalar fields in General Relativity or on modified f(R) gravity, which produce the best fit to all existing observational data, require only one dimensionless parameter taken from observations. These models include the pioneer R+R2 (Starobinsky) one, the Higgs model, and the mixed R2-Higgs model that has been...
According to the prescriptions of the conventional cosmological LCDM-model, first galaxies had to start their formation when hierarchically assembled dark halos reached 100 million solar masses. They are thought to be dwarf disk galaxies. In fact, the earliest galaxy is observed now at the redshift of z=11, about 0.5 Gyr after the Big Bang, and it is much more massive than a hypothetical...
In this talk I will review the presence of recently reported foregrounds in the cosmic microwave background (CMB) radiation associated with extended regions surrounding nearby galaxies. Using the cross correlation of Planck and WMAP maps and the 2MRS galaxy catalogue it is found that the mean temperature radial profiles around nearby galaxies at $ cz\le 4500$ km s$^{−1}$ show a statistically...
Recent results on $B_c$ production and decays from the proton-proton collision data taken by the ATLAS experiment will be presented.
The measurement of the differential ratios of $B_c^+$ and $B^+$ production cross sections at 8 TeV will be shown.
New results on the $B_c$ decays to $J/\psi$ $D_s(*)$ final states obtained with the Run 2 data at 13 TeV will also be reported.
Measurements of the neutron cross-sections of heavy nuclei and their
analysis at the IAE and ITEP, carried out in the 1950s and later, made
it possible to find out deviations from the statistical model in the
distributions of positions and spacings of neutron resonance levels.
This work is a review of the analysis of the energies
of nuclear states and the particle mass spectrum, based on...
We present new soliton solutions in a class of four-dimensional supergravity theories. For special values of the parameters, the solutions can be embedded in the gauged maximal N=8 theory and uplifted in the higher-dimensional D=11 theory. We also find BPS soliton configurations, preserving a certain fraction of supersymmetry.
Solitons play a special role in classical physics as well as in...
One of the most interesting properties of an atomic nucleus is its root-mean-square charge radius. This quantity can be measured using several different types of experiments. One of them is the observation of an isotopic shift in atomic spectra. An important feature of this method is the ability to determine the radii of short-lived nuclei. To find the radius from experimental data for one...
We use the sizes of dark spots at the EHT images of supermassive black holes M87 and SgrA for inferring their spins, a>0.75 and a=0.65-0.9, respectively. It is supposed that black spots at the EHH images of M87 and SgrA are the lensed images of their event horizon globes. We reconstruct the form of lensed event horizon by using numerical calculations of the photon trajectories in the Kerr...
It has been shown that non-Abelian vortex string supported in four dimensional (4D) ${\mathcal N}=2$ supersymmetric QCD (SQCD) with the U(2) gauge group and $N_f = 4$ quark flavors becomes a critical superstring. This string propagates in the ten dimensional space formed by a product of the flat 4D space and an internal space given by a Calabi-Yau non-compact threefold, namely, the conifold....
The first measurements of the transverse momentum
($p_{\rm{T}}$) spectra, integrated yields and mean $p_{\rm T}$ of $\Sigma^{0}$ and $\overline{\Sigma}^{0}$ hyperons
in pp collisions at $\sqrt{s} = 7$ TeV at the LHC are presented.
The $\Sigma^{0}$($\overline{\Sigma}^{0}$) is reconstructed
via its electromagnetic decay channel $\Lambda$($\overline{\Lambda}$)$\gamma$.
The $\Lambda$...
Monopole condensation causes color confinement and instantons induce chiral symmetry breaking. Color confinement and chiral symmetry breaking are closely tied to one another through monopoles and instantons in the QCD vacuum. However, it is difficult to reveal the quantitative relations and effects among monopoles, instantons, color confinement, and chiral symmetry breaking by perturbative...
Generation of 14C radioisotope in the Earth atmosphere occurs by the 14N(n,p)14C reaction under cosmogenic fluxes and this process is considered as the main source of radiocarbon creation with rate of accumulation is evaluated as ~ 6.6 kg per year. An exclusively opportunities of dating based on the analysis of 14C concentration in the very old and ancient organic samples led to the discovery...
We consider oscillons - localized, quasiperiodic, and extremely long-living classical solutions in models with real scalar fields. We develop their effective description in the limit of large size at finite field strength. Namely, we note that nonlinear long-range field configurations can be described by an effective complex field $\psi(t,\mathbf{x})$ which is related to the original fields by...
Nonstationary configurations of a massless spherically symmetric scalar field are considered. We use an approach to the construction of nonstationary gravitating configurations of a scalar field, which makes it possible to reduce the Einstein-scalar field system to a single equation written in invariant quantities. New exact and numerical nonstationary solutions for a massless scalar field are...
Studies of hypernuclei with proton or neutron excess are of particular relevance now in strangeness physics. Such systems scarcely studied experimentally can currently be produced in heavy ion collisions at NICA complex developed in DUBNA. Research in exotic hypernuclei can provide insight into various aspects of hyperonic interactions including density dependence of the ΛN interaction, core...
The NA65 (DsTau) experiment at CERN-SPS is studying tau-neutrino production process in proton-nucleus interaction and aims to improve significantly an accuracy of calculations of tau neutrino fluxes for accelerator based neutrino experiments. For detecting short lived particles (especially decaying via tau neutrino), the experiment uses a setup based on high resolution nuclear emulsions, that...
We perform canonical analysis of an action in which 2+1-dimensional gravity with negative cosmological constant is coupled to
cylindrically symmetric dust shell. The resulting phase space is finite dimensional having geometry of SO(2,2) group manifold.
Replacing the Poisson brackets by commutators results in the algebra of observables which is a quantum double D(SL(2)_q).
Deformation...
An overview of the latest results from Kaon experiments at CERN and the future prospect will be presented. The NA62 experiment collected the world's largest dataset of charged kaon decays in 2016-2018, leading to the first measurement of the branching ratio of the ultra-rare $K^+ \to \pi^+ \nu \bar\nu$ decay, based on 20 candidates.
The radiative kaon decay $K^+ \to \pi^0 e^+ \nu \gamma$...
Masses of nuclei constitute an important part of the nuclear data required by many astrophysical models. We describe a method of obtaining Bayesian estimates of difference expressions of nuclear binding energies for medium and heavy nuclei, such as the residual neutron-proton interaction energy $\Delta_{np}$ and the well-known Garvey--Kelson expressions, using the Markov chain Monte-Carlo...
In the last two decades, a number of observed flares in inactive galaxies have been associated with the tidal disruption of stars by strongly gravitating objects located in the centers of galaxies. Tidal disruption events provide us with a new channel for exploring the central compact objects. In this report, we compare tidal forces and some features of tidal disruption in the vicinities of...
Standard Model of high energy physics is very successful, but neutrino sector is not completely accommodated into it (e.g. neutrino oscillations). One of the possible solution is introduction of heavy sterile neutrino, which does not have any flavour and interacts with only flavour SM neutrinos via oscillations.
In this talk we present the preparatory studies dedicated to the future search...
The properties of the collective low-lying states of Zr isotopes indicate that some of these states are mainly spherical and the other are mainly deformed ones. In our previous works [1,2], it was shown that the structure of low-lying collective states of $^{96}$Zr can be satisfactorily described within the framework of a geometric collective model based on the Bohr Hamiltonian with a...
In this work we explore the nonpertorbative corrections, especcialy operator dimension which is connected to existing of short strings, basing on our method: processing of experimental data on $e^+e^-$-annihilation into even number of pions (BaBar, CMD-2, OLYA) by constructing the Adler function in two ways (through dispersion representation and through the OPE series), applying the Borel...
We consider a family of 4-dimensional black hole solutions
governed by natural number $q= 1, 2, 3 , \dots$, which appear in the model
with anisotropic fluid and the equations of state: $p_r = -\rho (2q-1)^{-1}$,
$p_t = - p_r$, where $p_r$ and $p_t$ are pressures in radial and transverse
directions, respectively, and $\rho > 0$ is the density. These equations of state obey weak,...
The radiation of photons by electrons is investigated in the framework of quantum electrodynamics up to the second order in the coupling constant e. The N-particle, coherent, and thermal initial states are considered and the forms of the electron wave packets are taken into account. The explicit expressions for the intensity of radiation and the inclusive probability to record a photon are...
A comprehensive analysis of the isoscalar giant monopole resonance (ISGMR) has long been a subject of extensive theoretical and experimental research [1,2]. The ISGMR properties are presently an important problem not only from the nuclear structure point of view [2,3] but also because of the special role they play in many astrophysical processes such as prompt supernova explosions [4] and the...
Using a nonperturbative approach based on the Cornwall-Jackiw-Tomboulis effective action Γ(S) for composite operators (S is the full fermion propagator), the phase structure of the (2 + 1)-dimensional Gross-Neveu (GN) and Thirring models is investigated. We have calculated Γ(S) and its stationary (or Dyson-Schwinger) equation for GN model and have shown that it has three different solutions...
The design of nuclear installations based on accelerators (or Accelerator Driven Systems - ADS) requires sufficiently accurate data on the total and differential cross sections for nuclear fission by neutrons with energies up to several hundred MeV. The situation with the reliability and completeness of such data and other important characteristics associated with them, which cannot always be...
**Heavy-ion-induced projectile fragmentation reactions at Fermi energies are of interest to investigate the properties of nuclei far from the valley of stability, to know more about nuclear potential and equation of state of nuclear matter. These reactions are also useful to obtain exotic nuclei to be used as secondary beams. The reaction mechanism of these reaction is complicated, this...
Solar cosmic rays are generated during the primordial energy release in solar flares. This explosive process takes place in the solar corona above the active region at altitudes of 15 000 to 70 000 km. It represents the fast release of the magnetic field energy of the current sheet, which is formed near a singular magnetic field line under the influence of disturbances propagating from the...
We present a short discussion of the Neutrino-4 experimental results and the results of other experiments searching for the sterile neutrino. We estimated the contribution of the sterile neutrino with parameters $\Delta m^2_{14} \approx 7.3 \text{eV}^2$ and $\sin^22\theta_{14} \approx 0.36$ obtained in the Neutrino-4 experiment to the energy density of the Universe. We address the...
Diffusion of relativistic runaway electron avalanches
One of the unsolved problems in atmospheric physics is the construction of a model of Terrestrial Gamma-ray Flashes (TGFs). This phenomenon was first discovered in 1994 by Compton Gamma Ray Observatory [1] and was observed by other space gamma-ray observatories such as Fermi [2], which were created for observing gamma radiation from...
The absolute polarimeter for measurements of proton and antiproton beam polarizations at the SPASCHARM experiment at U-70 of IHEP, Protvino, is discussed. Polarized target will be used to measure analyzing power AN of the elastic reactions. Measured value of AN is required to define beam polarization. Two different detectors of the experimental setup were analyzed. The first one is supposed to...
The possibility to use the pp-, pd- and dd- elastic scattering for the polarimetry at NICA using the existing experimental data is discussed. The first results of the simulation of these processes at the total energy up to 27 GeV for the segmented scintillation counter are presented.
The physical motivations and performance of the TAIGA (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy) project are presented. The TAIGA observatory addresses ground-based gamma-ray astronomy at energies from a few TeV to several PeV, as well as cosmic ray physics from 100 TeV to several EeV and astroparticle physics. The pilot TAIGA-1 complex locates in the Tunka valley,...
Data taking has been started at the first stage of the polarization experiment SPASCHAR$M at U70 accelerator. The report describes the detectors of the current experimental setup as well as the results of measurements of their characteristics during the beam data taking in the runs of 2018-2022
The Telescope Array (TA) is the largest cosmic ray observatory in the Northern Hemisphere. It is designed to measure the properties of cosmic rays over a wide range of energies. TA with it's low energy extension (TALE) observe cosmic ray induced extensive air showers between 2x10^15 and 2x10^20eV in hybrid mode using multiple instruments, including an array of scintillator detectors at the...
Industrial Detector of REactor Antineutrinos for Monitoring (iDREAM) is a prototype detector designed to demonstrate the feasibility of antineutrino detectors for remote reactor monitoring and safeguard purposes. The 1 ton Gd-doped liquid scintillator detector is mounted in the Kalinin nuclear power plant (Russia), 20 m from the 3 GW$_{th}$ VVER type commercial reactor. Antineutrinos are...
We study the prompt single and double J/ψ hadroproduction in the Improved Color
Evaporation Model using the Parton Reggeization Approach. We make calculations in a single manner to described the experimental data for prompt J/ψ transverse momentum spectra from the energy of $\sqrt{s}$=19 GeV up to modern energy of the LHC, $\sqrt{s}$=13 TeV. The numerical calculations are made using...
Antineutron studies are an unexplored domain of high energy physics. Several directions of research can be outlined, such as: measuring of hadrons decaying into antineutrons, measuring the interaction of antineutrons with hadrons, and searching for bound states of antineutrons. We present a method for measuring antineutrons by the electromagnetic calorimeter PHOS of the ALICE experiment. The...
The complementary approach to the investigations of extensive air showers (EAS) is very promising for conducting their multicomponent studies. In this approach, information about one or more EAS components, which is insignificant from the point of view of independent analysis, can be added to data on other components providing more accurate determination of the parameters of the extensive air...
A number of resonances compatible with a hypothesis of hidden-charm pentaquark was observed by the LHCb Collaboration. We interpret these narrow resonances as compact hidden-charm diquark-diquark-antiquark pentaquarks. Within this assumption, an interplay between the charmonium and open-charm modes is considered. Ratios of such modes is estimates for non-strange and strange pentaquarks are...
T2K (Tokai to Kamioka) is the first long-base neutrino experiment with the concept of an off-axis neutrino beam generated by a 30 GeV proton synchrotron (PS) based on the Japan Proton Accelerator Research Complex (J-PARC).
This project is aimed at finding of a new source of violation of charge-conjugation parity-reversal CP-symmetry in the neutrino sector - a necessary element for explaining...
In measurements with intense artificial sources of monochromatic neutrinos on gallium targets, a capture rate equal to 0.80 ± 0.05 of the expected was obtained. The measured lack of capture rate is known as the gallium anomaly (GA). Neutrino oscillation transitions with large values of the parameter Δm2 (~ 1 eV2) are considered a possible cause of GA. In the proposed BEST-2 experiment, the GA...
In a number of experiments on the study of ultrahigh-energy cosmic rays, an excess of muons in extensive air showers in comparison with calculations performed within modern (post-LHC) models of hadronic interactions is observed. An analysis of the NEVOD-DECOR data over a long period of time indicates an increase in the excess of muon bundles with increasing energy of primary cosmic ray...
Two installations currently operating as part of the TAIGA Astrophysical Complex [1]: TAIGA-HiSCORE [2] -120 wide-angle Cherenkov stations on an area of 1 $km^2$ and TAIGA-IACT[3] - 3 IACTs, are playing the most important role in research in the field of very high-energy gamma-ray astronomy. The large area and unique methodological capabilities of the complex allow us to hope for new and...
Masses of the ground and excited states of the fully-heavy tetraquarks, composed of charm $c$ and bottom $b$ quarks and antiquarks, are calculated in the diquark-antidiquark picture in the framework of the relativistic quark model based on the quasipotential approach and quantum chromodynamics. The quasipotentials of the quark-quark and diquark-antidiquark interactions are constructed...
The annihilation photons are the first system where the entanglement of quantum states was experimentally studied. These photons are produced in the positron-electron annihilation and have 511 keV energy that coincides with the electron mass. According to the theory, two photons have mutually perpendicular linear polarizations, and their quantum states are entangled. Inspite of extensive...
In this work, anomalous events recorded by the TUS space detector are considered. In this research we try to give interpretation of this anomalous events, which, mostly, are caused by the thunderstorm activity. Different interpretations of this events like gamma-ray bursts, synchrotron radiation in the geomagnetic field of electrons/positrons in cosmic rays, an ascending extensive air shower,...
DANSS detector at Kalininskaya nuclear power plant sets world records in antineutrino detection. Counting rates of up to 5000 events per day made it possible to collect more than 6.5 million antineutrinos in 6 years of stable operation. The data sample is extremely clean and features the signal to background ratio in excess of 50. Yet only moderate energy resolution of 34% at 1 MeV limits the...
We study the processes of the paired heavy meson and baryon production in electron-positron annihilation, gamma-gamma interaction and decays of the Higgs boson. Using the perturbative Standard Model and relativistic quark model we construct relativistic amplitudes and cross sections. Relativistic corrections connected with the relative momenta of heavy quarks are calculated in the production...
The $\nu$GeN experiment is aimed to study neutrino scattering at the close vicinity of the reactor core of Kalinin Nuclear Power Plant (KNPP) at Udomlya, Russia. Its main interests are connected with the detection of coherent elastic neutrino-nucleus scattering (CE$\nu$NS), the search for the magnetic moment of neutrino and other rare processes. The experimental setup is constructed under...
The RED-100 two-phase emission detector with 200 kg of liquid xenon as a working medium was exhibited at a distance of 19 m from the core of the VVER-1000/320 nuclear power reactor at the 4th power unit of the Kalinin NPP in 2021-2022. Due to its high sensitivity to weak ionization signals (down to single electrons), the RED-100 detector was used to observe elastic coherent scattering of...
Aging of the plastic scintillators plays a significant role in the degradation
of detectors performance. Several effects are considered responsible for
this process like mechanical stresses, water penetration and oxidation.
The DANSS detector core consists of 2500 polystyrene based scintillation strips.
The detector is located just below an industrial nuclear reactor
of Kalininskaya NPP. The...
The processes with single top quark production provide a prototype search for the types of final state that are expected in many new physics scenarios. Some distinctive features are considered for particle production in the top sector in ultra-high energy domain which can be covered partly in the collisions of cosmic ray particles with atmosphere. The single top quark production through...
Observations of monthly electron and positron fluxes made from 2006 by PAMELA experiment continue investigation of the relative modulation of positively and negatively charged particles.
The comparison of the electron fluxes with proton and positron fluxes measured at about 1 GV in 23th and 24th solar cycles is presented.
This report discusses one of the stages of work on the creation of artificial pinning centers in superconducting tapes, for the possible creation of a series of superconducting magnets based on them, operating at temperatures up to 65 K.
The report describes the experimental setup and the results of irradiation of the HTS samples in the neutron-proton field of the lead converter, analyzes the...
The behavior of a beam with elliptical cross-section and arbitrary partial emittances in a solenoid is studied analytically. Such analysis is needed for various tasks of accelerator physics, for example, the formation of the beam extracted from the ion source and for the Low Energy Beam Transport (LEBT) design. The peculiarities of the coupling of the beam oscillations in longitudinal magnetic...
I.N. Borzov 1,2, S.V. Tolokonnikov1,3, S.S. Pankratov 1, A.V. Khudov4
1 National Research Centre “Kurchatov Institute”, Moscow, Russia.
2Bogolubov Laboratory of Theoretical Physics, Joint Institute of Nuclear Research, Dubna, Russia.
3 Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Russia.
4 National Research Nuclear University MEPHI, Moscow,...
Polarizability is a fundamental particle property. Measurement of pion
polarizability values allows checking strict ChPT prediction. Charged and
neutral pi-mesons polarizability will be extracted from the CPP and NPP
experimental data using Primakoff pair production cross-section on nuclear target. The CPP/NPP experiment run at TJNAF Hall-D was conducted in the summer of 2022 and utilized a...
Inclusion in Analysis of Borexino data K-40 antineutrino spectrum makes the fit better than without. Borexino data can install an upper limit on potassium abundance < 3% of Earth's mass. The probability to observe high K-40 counting rate in case of its absence is about 0.0001. It signals on large potassium abundance in the Earth.
The results of the study of the specific light output from the energy of X-rays and gamma quanta in the range from 1.5 to 662 keV for scintillation crystals NaI (Tl), CsI (Na), CsI (Tl), Bi4Ge3O12, CdWO4, ZnWO4, Y3Al5O12: Ce, CaF2 (Eu), LSO, YAlO3: Ce. The obtained dependences have a nonlinear form with pronounced minima in the region of the K and L edges of the absorption of the elements that...
A method for finding the position of the sectors of the time projection chamber based on experimental data is proposed. Based on the results of modeling the response of the sensitive elements of the camera, three types of tracks were reconstructed: cosmic muons, beams of the laser detector system and muons from the interaction of nuclei. Using these artificial experiment data and the proposed...
Dark Matter particles that are constructed from proton-antiproton String Junctions (SJ,antiSJ) was already announced at ICPPA18. Essencial specifics in spectra of baryons in p-p interaction are leading to new implications for cosmic ray physics and astrophysics. VHE event in stratosphere has shown that the pattern of astroparticle collision differs from nucleus-nucleus interaction. It can be...
We study a $D$-dimensional Einstein-Gauss-Bonnet model which includes the Gauss-Bonnet term, the cosmological term $\Lambda$ and two non-zero constants: $\alpha_1$ and $\alpha_2$. Under imposing the metric to be diagonal one, we find cosmological type solutions with exponential dependence of three scale factors in a variable $u$, governed by three non-coinciding Hubble-like...
To study the conditions of thermal equilibrium of relativistic electron beam (REB) is important for numerous fundamental and applied tasks of accelerator physics and space physics as well as physical electronics. In our report the analytical study of the dynamics of neutralized relativistic electron beam is presented. The beam parameters are found which correspond to equilibrium propagation of...
The article considers geo-effective phenomena that arose in near-Earth outer space and on Earth during 23 and 24 cycles of solar activity. The results of the SWPC NOAA data processing showed that about 90% of proton events with an energy of $p_T > 100$ MeV and 100% of terrestrial increases (GLE) are associated with solar flares with a capacity of more than M5.0. Methods of operational...
The spectroscopy of higher lying charmonium states together with exotic mesons with masses above the $2\,m(D)$ open charm threshold has been full of surprises and remains poorly understood [1]. It is a good testing tool for the theories of strong interactions, including: QCD in both the perturbative and non-perturbative regimes, LQCD, potential models and phenomenological models. The...
The characteristics of detectors made of silicon carbide (SiС) irradiated with various integral fluxes of both Xe ions with an energy of 165 MeV and fast neutrons were studied. With the help of alpha-particles, it was found that the energy resolution of SiC detectors irradiated with the maximum fluxes of heavy ions ($F_{max} = 2.3\times10^9$ ion/cm$^2$) and neutrons ($F_{max} =...
Placement of the hydroacoustic antenna-detector for ultrahigh energy neutrino
directly below the underwater acoustic channel gives several important advantages.
They simplifies the creation of the phased hydroacoustic array and signal processing for registration of such neutrinos. High temperature of the Mediterranean in comparison with other seas improves detector sensitivity. Placement of...
Double electron-capture (EC/EC) of $^{58}$Ni on excited states of $^{58}$Fe is investigated at Baksan neutrino observatory INR RAS in DULB-4900 laboratory (4900 m w. e.) using the ultralow-background HPGe detector with a sensitive volume of 200 cm$^3$ ($\sim1$ kg mass) and a natural nickel sample of $\sim68$% $^{58}$Ni with a mass of $\sim 6$ kg. The detector is surrounded by low-background...
When the temperature of the pyroelectric single crystal changes, X-ray generation is possible. To obtain the above effect, it is necessary to change the temperature of the crystal in vacuum (pressure on the order of several mTorr). Under such conditions, an electric field arises between the grounded target and the crystal surface, which causes the field emission of electrons from the crystal...
In recent decades, Cherenkov water (ice) telescopes such as IceCube, Baikal-GVD and KM3Net have been actively developed for research in the field of neutrino physics and astrophysics. Optical modules are the main detecting elements of such neutrino telescopes.
Calibration of optical modules of different neutrino telescopes under the same conditions is one of the important experimental...
A.T. D’yachenko$^{1,2}$, M.S. Abu-Khasan$^{2}$
$^{1}$ National Research Center “Kurchatov Institute” B.P. Konstantinov Petersburg Nuclear Physics Institute, Gatchina, Russia:
$^{2}$ Emperor Alexander I Petersburg State Transport University, St. Petersburg, Russia
Within the framework of our approach, we have found an analytical solution of the equations of hydrodynamics in the soliton...
We study deuteron- proton elastic scattering in the GeV energy range.
Nowadays, a significant amount of the experimental data at these energies
has been accumulated both with unpolarized and polarized beams. However,
a theoretical description of the data faces problems because of
well developed Faddeev calculation technique cannot be applied at these energies.
In this report we...
Scientific project GAMMA-400 relates to the new generation of space observatories intended to perform a search for signatures of dark matter in the cosmic gamma emission, measurements of characteristics of diffuse gamma-ray emission and gamma-rays from the Sun during periods of solar activity, gamma-ray bursts, extended and point gamma-ray sources, electron/positron and cosmic-ray nuclei...
We study the one-parameter generalizations of the Starobinsky model of inflation, which obey all observational constraints on the inflationary parameters. Our models are connected to the original Starobinsky model via continuously changing an additional parameter. Modifying the Starobinsky $R+R^2$ inflationary model by adding an $R^{3/2}$-term, we find that the tensor-to-scalar ratio...
Axion is a hypothetical pseudoscalar Nambu-Goldstone boson that was introduced as an extension to the Standard Model intended to solve the strong CP problem.
It also could be a possible solution for a series of other fundamental physics problems such as the the dark matter or photon ultratransparency of the Universe.
As the least model-dependent axion interaction is its interaction with a...
The multipomeron exchange model was considered earlier in papers [1 – 5]. Within the framework of this model, it was possible to successfully describe the charged multiplicity (Nch), mean transverse momentum (pt) and pt-Nch correlations in pp and pp¯ collisions over a wide energy range (from ISR to LHC). It allowed also to reproduce the growth of the yields of strange, multi-strange and charm...
Phase structure of dense quark matter with chiral and isospin imbalance is considered in the framework of effective models. There has been considered as two color as well as three color QCD. It was shown that chiral imbalance has several rather peculiar properties such as being universal catalyzer,
i. e. it catalyzes all the considered symmetry breaking patterns in the system, including the...
Particle identification at the Super Charm-Tau factory experiment will be provided by a Focusing multilayer Aerogel
ring imaging Cherenkov detector FARICH. Due to hardware constraints the detector captures a great amount of noise
which must be mitigated to reduce both a data flow and further storage space.
In this presentation we present our approach to filtering signal hits. The approach is...
The existence of dark matter has been discussed for more than a century. Today we have a compelling body of evidence for this elusive component of the Universe, based on a variety of observations, at different scales, but no experiment has detected dark matter yet. This talk will focus on direct detection of dark matter.
The null result of both direct detection and LHC searches has produced a...
A summary what we have obtained with Borexino
Neutrino is considered as an ideal astronomical messenger thanks to not being deflected or absorbed by interstellar medium. Detection of neutrinos from distant high-energy cosmic accelerators has been a long-standing problem emerged in the last quarter of the 20-th century. And only in 2013 was the diffuse cosmic neutrino flux discovered by the 1 km3 -scale IceCube neutrino telescope at the...
A review and status of neutrino oscillations studies from long baseline accelerator based experiments will be presented. An emphasis will be placed on recent results from running experiments such as T2K and NOvA. In addition the status plus plans of future experiments DUNE and HyperK will also be discussed.
A.T. D’yachenko$^{1,2}$
$^{1}$ National Research Center “Kurchatov Institute” B.P. Konstantinov Petersburg Nuclear Physics Institute, Gatchina, Russia;
$^{2}$ Emperor Alexander I Petersburg State Transport University, St. Petersburg, Russia
We managed to completely describe the spectra of cumulative protons, pions and photons for the collision of carbon nuclei with a beryllium target in the...
The intrinsically large variation of the energy deposited in a calorimeter by hadrons imposes limitations on the improvement of hadron energy resolution. The fluctuation of electromagnetic fraction within a hadronic shower is known to be one of the main sources of such variations. Several techniques were developed to improve the energy resolution for hadrons including the so called hardware...
Bose–Einstein correlations of charged pions in Au+Au collisions at $\sqrt{s_{NN}}$ = 3 GeV from UrQMD
A. Kraeva${}^{1,2}$, G. Nigmatkulov${}^{1,2}$
E-mail: annakraeva555@gmail.com, nigmatkulov@gmail.com
The method of correlation femtoscopy makes it possible to estimate the parameters of the particle-emitting region (radius of emission region, $R$, and correlation strength, $\lambda$)....
The technology of highly granular calorimeters is one of the main innovations that will be implemented in planned experiments on future colliders. This work shows an algorithm for the improvement of energy resolution in highly granular calorimeters based on a machine learning technique. An artificial neural network, which helps to connect calorimeter observables, was trained and tested. The...
M.Bhattacharjee1,3, S.A.Bulychjov2, Yu.F.Krechetov1, V.V. Kulikov2,
M.A. Martemianov2, M.A. Matsyuk2, I.A. Tyapkin1
1 Joint Institute for Nuclear Research, 141980, Dubna, Russia
2 National Research Center “Kurchatov Institute”, Moscow, 123182 Russia
3 Gauhati University, Guwahati, Assam 781014, India
In a framework of the NICA/MPD project [1], a cylindrical electromagnetic calorimeter...
Collisions of oxygen nuclei are planned in future LHC runs to scan the size of colliding systems at ultrarelativistic energies [1]. As shown by calculations [2,3], the admixture of the alpha-clustered states in O-16 leads to a triangular modulation of elliptic flow from the overlap region of colliding nuclei. The measurements [4] and modelling [5,6] of fragmentation of O-16 projectiles of...
The interaction of neutrinos with photons at high energies is considered within the standard electroweak theory. It is pointed out that the theory admits the presence of resonant channels in the production of massive bosons in neutrino$-$photon reactions. Some consequences of the existence of such channels for scattering of neutrinos on atomic nuclei are discussed. In particular, we show the...
Experimental results of ALICE collaboration on the emission of forward neutrons in ultraperipheral collisions of $^{208}$Pb nuclei at $\sqrt{s_{\mathrm{NN}}}=2.76$ and $5.02$ TeV are reviewed. Electromagnetic dissociation (EMD) events with the lowest multiplicity of 1, 2 or 3 neutrons dominate at both collision energies. The cross sections for 1n – 5n emission with and without protons were...
SPD (Spin Physics Detector) collaboration proposes to install a universal setup in the second interaction point of the NICA collider (JINR, Dubna) to study the spin structure of the proton and deuteron. It will be able to research of spin-related phenomena with polarized proton and deuteron beams at a collision energy up to 27 GeV and a luminosity up to 10$^{32}$ cm$^{-2}$ s$^{-1}$. In this...
The mantle -- a layer of nonspherical (pasta-like) nuclear shapes -- can exist in neutron stars and play an important role in their dynamics and evolution. We analyze accuracy of the Compressible Liquid Drop Model (CLDM), based on the thermodynamically consistent description of the surface properties calculated for the two-phase plane interface for given energy-density functional (for...
Spin Physics Detector (SPD) will be created at NICA accelerator facility in Dubna, Russia. One of the aims of the experiment is a study of spin effects in polarized proton-proton and deuteron-deuteron collisions at high energies. The other very important aim is an extraction of gluon distribution function of nucleons. Minimal bias interactions will be studied also. We will consider problems of...
The LHCb Upgrade phase II aims to collect $300 fb^{-1}$ in a few years operating at a luminosity of $1.5*10^{34} cm^{-2} s^{-1}$. This requires a significant change of the systems including the electromagnetic calorimeter (ECAL), which must be capable to sustain integrated radiation doses up to 1 MGy in the innermost region. The second major requirement is time resolution of the order of a few...
The solution of the kinetic equation for finding the distribution function of photons of two possible polarizations in an equilibrium e+e- plasma in a relatively strong magnetic field in the cold plasma approximation and taking into account
resonance on a virtual electron is considered. Using the Laplace transform and sum of the distribution function in terms of Legendre polynomials, the...
The HYDJET++ event generator is a phenomenological model of heavy-ion collisions that treats the collision process as a combination of a soft hydro-type state and a hard state resulting from hard parton scattering.
On the one hand, it allows one to quickly simulate relativistic heavy-ion
collisions, and on the other hand, it reproduces and describes a number
of experimental phenomena in the...
The data [1] on spectra of $K_S^0$ mesons measured by the STAR Collaboration in $\rm Au+Au$ collisions at various centralities characterized by different multiplicity densities of negative particles were analyzed in the $z$-scaling approach [2,3]. The transverse momentum distributions obtained in the BES-I program at RHIC were accumulated in seven centrality classes from the most central...
Experimentally, correlations between multiplicity of charge particles and the mean transverse momentum were seen in $p+p$ collisions from the highest SPS energy to the LHC energy. The extension of the experimentally established pattern of the change from negative correlations at energies $\sqrt{s}$ = 17–40 GeV by measurements at lower energies is particularly significant [1]. This set of...
The NA61/SHINE is a fixed target experiment at SPS (CERN) aimed to study proton-ion and ion-ion collisions with the energy range 13 – 150 AGeV. A new physics program of the NA61/SHINE experiment beyond 2020 includes open charm measurements. The increased by an order of magnitude beam rate requires detectors upgrade to work with high trigger rate and to survive in new high radiation...
Detection of low energy neutrino is a challenging task for advanced
studies of coherent neutrino scattering processes or for the observation
of neutrino magnetic momentum. For this purpose, the detector must be
capable to register the deposited energies starting from a hundred of
eV. One of the option is the development of CsI(pure) scintillation
detector operating at the temperature of...
The helicity of quark-gluon medium is transmitted to spin polarization through axial anomaly. The possibilities of distinguishing of this mechanism, incorporating the recent data, from the thermodynamic one are discussed. The other manifestations of helicity, mimicking the chiral magnetic and vortical effects are also considered.
Phenomenological model of color quark-gluon strings as particle emitting sources [1] is developed and used to study correlations in rapidity of different event observables such as multiplicity and mean particle transverse momenta [2]. The color strings dynamics at initial stages of the relativistic collisions is considered both in rapidity dimension [3] and in transverse plane [4]. The former...
Based on the relativistic constraint technique[1] for the Dirac equation in the two-particles problem[2] positronium states in a strong uniform magnetic field are studied. The width of the singlet positronium state in such conditions is obtained in the explicit form. It is shown that the magnetic field sufficiently increases the decay width, comparing with the case of a free positronium....
In high energy physics, software infrastructure for the analysis of experimental data is tightly connected with the specifics of experiment: detector setup, collision system, reconstructed event and track information. However, the aspects of physics analysis are common. In this work, we present a framework for correlation femtoscopy technique that could be applicable for any experiment.
It is...
Studying spin-related phenomena will help uncover information about internal structure of nucleon. It can be done using polarized beams of protons and deuterons. To study those effects on NICA collider it is proposed to install the Spin Physics Detector(SPD) in one of two interaction points.
In this work two problems were studied. First is developing a fast and accurate algorithm for...
Multiple particle production in pp interactions at LHC energies is considered in a model with quark-gluon strings (color flux tubes) as sources, assuming the string cluster formation. Within this model multiplicity distributions of charged particles, their combinants and the properties of the strongly intense variable Σ, which characterizes the correlations between the number of particles in...
Dark matter lighter than 10 GeV/c2 encompasses a promising range of candidates. The new analysis of the entire dataset acquired with a low-radioactivity argon target by the DarkSide-50 experiment at LNGS is presented. The new analysis benefits from more accurate calibration of the detector response, improved background model, and better determination of systematic uncertainties. A conceptual...
The results of development and laboratory testing of a prototype data concentrator integrated circuit (ASIC HUBv1) are presented. HUBv1 was developed for processing of signals from the detector chips of the time-projection chamber of the MPD experiment (NICA, Dubna). The main target of this ASIC is uninterrupted processing and serialization of digital output data from two SAMPA detector chips...
The correlation between particles produced at various pesudorapidity values is an important probe to disentangle the underlying dynamics of multi-particle production in high energy collisions.
The long-range correlations are believed to be free from final-state effects.
The correlation strength ($b_{corr}$) has been studied for forward ($N_{F}$) and backward ($N_{B}$) charged partice...
The shape of redshift distribution for uniform sources set in our Metagalaxy defined by cosmological parameters and properties of space. The type Ia supernovae usually considered as a homogeneous subsample because of suggestion that these luminous events could be used as standard candles for cosmological measurements. This mention occurs since the earliest studies of supernovae in 1938....
Preliminary results of the investigation of the properties of 13 clusters of galaxies from CfA2 redshift survey are discussed in the presented article. The distributions on absolute magnitude and luminosity represent two areas for clusters ##88, 1101, 1046, 142, 933, 1242, 1652, 107, 150, 316, 317, 961, 977. Redshifts of these clusters are in the region 0.002 – 0.032. Also several anomalies of...
The possible appearance of the effects of local parity breaking in the QCD medium formed in heavy ion collisions can happen due to violation of chiral symmetry, the difference between the average densities of right- and left-handed quarks in the fireball [1]. In the statistical approach, it can be quantified by corresponding chiral chemical potential $\mu_5$ [1,2]. The experimental...
The calculation based on next-to-leading logarithm (NLL) approximation for Balitsky-Fadin-Kuraev-Lipatov (BKFL) evolution is discussed for Mueller-Navelet (MN) dijet production cross section as well as ratios of cross sections with veto as functions of rapidity separation $\Delta y$ between jets in dijet. The NLL BFKL calculations employ optimal renormalization scale procedure generalized for...
The cool storage ring (CSR) external-target experiment (CEE) will be the first large-scale nuclear physics experiment at the Heavy Ion Research Facility in Lanzhou (HIRFL). Within the project of CEE, a gaseous detector is being developed for the beam monitoring. It is designed to measure the lateral position of each beam particle up to a rate of $10^{6}$ pps with a spatial resolution better...
We present results of simulations of the light-nuclei production in relativistic heavy-ion collisions within the updated event generator based on the three-fluid dynamics (3FD), complemented by Ultra-relativistic Quantum Molecular Dynamics (UrQMD) for the late stage of the nuclear collision~--- the Three-fluid Hydrodynamics-based Event Simulator Extended
by UrQMD final State interactions...
In the frame of the JINR scientific program on study of hot and dense baryonic matter a new accelerator complex Ion Collider fAcility (NICA) based on the Nuclotron-M is under realization. It will operate at a luminosity up to 1027 cm-2 s-1 for ions up to Au79+. Two interaction points are foreseen at NICA for two detectors which will operate simultaneously. One of these detectors, the...
The model analysis of particle production in heavy ion collisions depending on number of emission sources (wounded nucleons or partons) at different centralities is performed in a wide collision energy range from RHIC to LHC and for all measured pair of heavy ions.
The model of wounded partons based on Glauber calculations gives better scaling for the ratio of charged particle multiplicity to...
An extension of the action of the General Relativity in a form of Noether symmetrical fourth order polynomial in the Riemann curvature tensor is suggested and discussed as a possible fundamental theory of gravity in 4-dimensional space-time in direct analogy with the standard fundamental theory of the particle physics with the Lagrangian being polynomial in fundamental fields as well. The...
The search for neutrinoenter code hereless double $\beta$-decay, in particular double K-capture, is of great importance. Confirmation of its existence would mean that the neutrino is Majorana particle. The investigation of this process provides one of the best opportunities to study physics beyond the Standard Model. The double electron capture process 2EC2$\nu$ was experimentally discovered...
NICA (Nuclotron-based Ion Collider fAсility) is a new accelerator complex designed at the Joint Institute for Nuclear Research to study properties of dense baryonic matter. Two interaction points are foreseen in the NICA collider: one for studying the collision of heavy ions on the Multipurpose detector MPD, the other for polarized beams for the experiment on the SPD installation. The...
The NA61/SHINE experiment at the CERN SPS has recently extended its program for the energy scan with Pb ions. In the past, the NA49 experiment, which preceded NA61/SHINE, also recorded data for Pb-Pb collisions at different energies. Together, the two experiments
cover a wide range of beam energies provided by the CERN SPS in the range 13 - 150 A GeV/c. Analysis of the new NA61/SHINE data and...
The LEGEND experiment is designed to search for neutrinoless double beta decay of Ge-76. Its first stage, LEGEND-200, is located at the Laboratori Nazionali del Gran Sasso (LNGS, Italy). About 200 kg of germanium detectors isotopically enriched in Ge-76 are going to be immersed in liquid argon (LAr) cryostat together with the LAr instrumentation system. The LEGEND-200 goal is to improve the...
Interest in primordial black holes (PBHs) has strongly increased after the recent LIGO detection of gravitational waves from merging black holes. It is especially interesting that the intrinsic rotational momentum of these black holes is close to zero, which is difficult to explain for astrophysical black holes, but turns out to be quite logical for PBHs. Also, it is interesting that masses of...
A new Time-Of-Flight neutron detector for the BM@N experiment at JINR, Dubna is planned to be developed and produced. This detector will identify and measure the energies of neutrons produced in nucleus-nucleus collisions at energies up to 4 AGeV. Detector design utilizes small (40x40x25mm) scintillator tiles with solid-state readout, with timing resolution of up to 100-150ps. A small-scale...
AMoRE (Advanced Mo based Rare process Experiment) is an international collaboration searching for the neutrinoless double beta decay of 100Mo using scintillating molybdate crystals with metallic magnetic calorimeters as low temperature sensors. AMoRE-I, as the first phase experiment with 6,2 kg of the calcium and lithium molybdate crystals, has been installed at the Yangyang underground...
The results on the the vector Ay and tensor Ayy and Axx analyzing powers in deuteron-proton elastic scattering at large scattering angles are presented. These data were obtained at internal target at JINR Nuclotron in the energy range 400-1800 MeV using polarized deuteron beam from new polarized ion source. New data on the deuteron analyzing powers in the wide energy range demonstrate the...
Baryonic Matter at Nuclotron (BM@N) is the first experiment at the NICA accelerator complex. The aim of the BM@N experiment is to study interactions of relativistic heavy ion beams with fixed targets. Detectors based on Gas Electron Multipliers (GEM) are used of the central tracking system, which is located inside the BM@N analyzing magnet. The next BM@N physics run is planned at the end of...
The BM@N experiment is an ongoing fixed-target experiment launched on the extracted beam of the Nuclotron accelerator to study highly compressed nuclear matter. The forward detectors of the BM@N experiment are designed to determine the geometry of nucleus-nucleus collisions - the centrality and orientation of the reaction plane, as well as to measure the charge distributions of spectator...
At the beginning of 2021, the project of the SND@LHC experiment was adopted by CERN - this is a compact experiment designed to study all three neutrino flavors and search for weakly interacting particles at the LHC in the pseudorapidity range of $7.2<\eta<8.6$, inaccessible to other experiments at the LHC. The detector is capable of detecting particles of light dark matter scattered by target...
Two particles angular correlations are a useful tool to study the mechanisms of particle production by observing the angular correlation (∆η,∆ϕ) between pairs of particles in an event. Different structures in the ∆η − ∆ϕ space are caused by various mechanisms of particle production and interactions between particles shortly after production. Examining these structures can give us insight
into...
Specialized muon neutrino beams at high-energy proton accelerators are produced as tertiary particles from $\pi^\pm,K^\pm \rightarrow \mu^\pm + \nu_\mu(\widetilde \nu_\mu)$ decays. The neutrino channel itself generally consists of a focusing system that forms $\pi,K$ mesons beams at the required momentum and angular intervals and a free decay section ending by hadronic and muon absorbers.
To...
Along with the more well-known massive cosmic strings, their massless counterparts can also exist in the universe. Such strings, having no tension, have a linear energy density and therefore can contribute to the gravitational wave background, generating gravitational bursts of various durations. We are investigating two different mechanisms for the generation of these gravitational bursts....
A more recently launched UCN source development utilizes superfluid helium (He-II) as conversion medium of cold neutrons into ultracold one. Initially proposed and designed for PNPI’s old WWR-M reactor, the project has been reshaped to equip the institute’s PIK reactor with a modern UCN source of this type. The projected UCN density in the closed source chamber is 2200 cm-3, which, as...
Centrality is an important concept in the study of strongly interacting matter created in a heavy-ion collision whose evolution depends on its initial geometry. Experimentally collisions can be characterized by the measured multiplicities or energy of produced particles or spectator fragments. Relation between collision geometry and experimentally measured multiplicities is commonly evaluated...
The formation of solitons foam in the early Universe in the model with two real scalar fields and potential having at least one saddle point and a local maximum is considered. The initial fields distribution is obtained by quantum fluctuations simulation in the framework of Starobinsky's inflation. The formation and evolution of domain walls bounded by strings and solitons foam are discussed...
Monte Carlo simulation of the complex of research with ultracold neutrons at the PIK reactor (Gatchina, Russia) is carried out. The complex is being built on the basis of a high-intensity source of ultracold neutrons at the GEK-4 channel. A Monte Carlo model has been developed, which includes a source, a neutron guide system and experimental installations, taking into account their real...
Momentum of an interacting neutrino is known with a poor accuracy in accelerator-based neutrino experiments. The type and chirality of neutrino interacting in the detector are also often not exactly known in these experiments. These problems could be solved by using a new experimental method called neutrino tagging. The method consists in exploiting the kinematics of the neutrino production...
The creation of the artificial MeV-energy electron antineutrino sources moves forward the serious demands for used isotopes and nuclear reactions for realization of the task: well defined and hard neutrino spectrum (taking in mind the proportionality of the cross section to square energy); availability and purity of the chosen isotope. The Li-7 (92.5% in the natural lithium) isotope fully...
Nowadays dark matter models with thier own dark interaction becoming more popular. They solve a number of problems of cold dark matter model ($\Lambda$CDM). The simplest viable model of self-interacting dark matter (SIDM) is a model with dark Coulomb-like interaction (with dark photon “y” as carrier) and a set of two types of particles: dark electron ($e_y$) and dark proton ($p_y$). In...
Selection of the very recent results by the Compact Muon Solenoid (CMS) Collaboration on heavy-ion physics in relativistic collisions at LHC energies will be presented.
Trackers build of straw drift tubes are a perfect solution for precise track measurements in High Energy and Neutrino Physics experiments operating at low and moderate event rate. Straw Trackers will play crucial roles in such future detectors as Near-Detector Complex of the DUNE experiment, Hidden Sector Detector of the SHiP experiment and the SPD detector. Performance requirements on a...
The ALICE experiment is dedicated to the studies of the hot and dense QCD medium, the quark-gluon plasma, which can be created in ultrarelativistic heavy-ion collisions at the LHC. In this presentation, we will highlight recent ALICE results from LHC Run 2 that provide an important step towards our understanding of the QCD matter explored with heavy-ion collisions. We will also present latest...
The Multi-Purpose Detector (MPD) is now under construction in the Nuclotron-based Ion Collider fAcility (NICA) at the Joint Institute
for Nuclear Research (JINR) in Dubna. The MPD is designed to study heavy-ion collisions in the energy range $\sqrt{s_{NN}}=4-11$ GeV to
probe the QCD phase diagram at modest temperatures and high baryon densities.
The MPD is realized by an international...
The upcoming run at the Baryonic Matter at Nuclotron (BM@N) experiment at JINR in Dubna has its aim to study the properties of dense baryonic matter, such as the equation-of-state and new microscopic degrees-of-freedom. The Xe+CsI collisions at the beam energies of up to 4A GeV are believed to produce strongly interacting matter which emerge at the core of compact stellar objects such as...
In this talk I will present a new method to define a vacuum state for fields in curved spacetimes, which encompasses the adiabatic prescription. New vacuum states can emerge in situations where the adiabatic method is impossible. Its application is immediate. As it is well known, cosmological observations suggest that the structures in the Universe arise from quantum fluctuations of an...
CNO cycle of thermonuclear reactions is one of the two main energy production mechanisms in the main sequence stars, dominant in those heavier than the Sun.
In the context of solar physics, despite its minor role in the energy production, the CNO cycle is of a particular interest for it is directly related to the abundance of heavy elements in the solar core.
The Borexino experiment provided...
The invariant differential cross sections of inclusive $\pi^0$ and $\eta$ mesons were measured in the midrapidity region in pp collisions at $\sqrt{s}$ = 13 TeV and p--Pb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV in a wide transverse momentum ($p_{\mathrm{T}}$) range with the ALICE experiment. The unprecedentedly large $p_{\mathrm{T}}$-range was achieved by combining various analysis techniques...
The change in temperature of single crystals in vacuum conditions, such as lithium tantalate (LiTaO3), gives an attractive possibility to generate and accelerate electron and positive ions fluxes up to 100 keV and more. This phenomenon is a base of the conception of a pyroelectric accelerator. This type of the accelerator is a compact device, which does not require an external high-voltage...
The deconfined state of strongly interacting quarks and gluons, quark-gluon plasma, may be formed in relativistic ion collisions at sufficient temperature and energy density. The signatures of quark-gluon plasma formation were observed in heavy-ion collisions by studying $\phi$ meson production. In small-collision systems, such as p+Al, p+Au, d+Au, and $^3$He+Au, the volume and lifetime...
From strangeness to charm and beauty with Inner Tracking System of ALICE at LHC
Grigory Feofilov, Saint-Petersburg State University, RF,
on behalf of the ALICE Collaboration
In the first part of this talk, we present the major motivations for the current new ALICE physics programme of measurements of low-momentum charm and beauty hadrons and low-mass dielectrons in heavy-ion collisions...
We study the generation of the baryon asymmetry of the universe (BAU) and relic gravitational waves (GWs) in turbulent hypermagnetic fields (HMFs) in the symmetric phase of the early universe before the electroweak phase transition (EWPT). The noise of HMFs is modeled by the analog of the magnetic hydrodynamics turbulence. The evolution of HMFs is driven the analogs the chiral magnetic effect...
Evaluation of the impact parameter in a single event of relativistic heavy ion collision is crucial for correct and efficient data processing and analysis. In this work, we studied the possibility of estimating the impact parameter in heavy ion collisions by using artificial neural networks applied to the charged particle data from the fast microchannel plate (MCP) detectors.
To carry out...
ALICE-3 is being designed as a next-generation heavy-ion experiment to be operated at high-luminosity Large Hadron Collider (HL-LHC) at CERN after 2030. With a factor of fifty higher luminosity, the ALICE-3 will be able to study properties of quark-gluon matter with the probes, which were previously unavailable due to small cross-sections, high background levels, and insufficient sensitivity...
We have shown that the mechanism of gravitational baryogenesis leads to a strong instability of the curvature scalar, resulting in its boundless exponential rise. This instability appears because the coupling of the curvature to baryonic current leads to the fourth order differential equation of motion for the curvature scalar, instead of the algebraic one in the conventional General...
NOvA is currently operating 2nd generation long-baseline neutrino oscillation experiment, based on NuMI complex at Fermilab (USA), having two large highly-segmented liquid scintillator detectors it has precise capability to measure neutrino’s and many other particle physics aspects. During the last several years NOvA have got and published important results on neutrino oscillation properties...
The data acquisition system contains 1488 Front-End Cards (FEC) grouped into 24 groups of 62 pcs. in each. Each FEC has an individual full-duplex few gigabit communication channel with Readout and Control Unit (RCU). The RCU manages each FEC within the group, collects data and then transmits it via a high-speed optical channel. Every 4 optical channels are connected to a Local Data...
Recently, several experiments reported small violations of radioactivity law in alpha- and beta-decay of heavy nuclei [1,2]. Beside standard exponential time dependence of nuclei decay rate, they found additional periodic terms of the order .05% corresponding to annual and daily nucleus life-time oscillations. It supposes that decay parameter variation can be related to temporary ...
A series of low-pressure time-projection chambers for experiments with low-energy ions is being developed at the Budker Institute of Nuclear Physics. The development of the series began with the creation of a test chamber with the GEM based readout for the separation of ions by measuring the stopping range in the gas medium. This detector is designed to upgrade the accelerator based...
The study of the azimuthal anisotropy of hadron production provides the opportunity to investigate properties of nuclear matter at extreme energy densities, where quarks and gluons are deconfined. This state of matter was called quark-gluon plasma (QGP). The second order coefficient of azimuthal anisotropy, i.e. the elliptic flow ($v_{2}$), is one of the main observables measured in...
The orbital evolution of a binary system consisting of two clusters of primordial black holes is investigated. The formation of such clusters is predicted in some theoretical models. A cluster consists of the most massive central black hole surrounded by smaller black holes. Similarly to single primordial black holes, clusters can form bounded pairs and merge during the orbital evolution. The...
The neutrino propagation and oscillations in various gravitational fields are studied. First, we consider the neutrino scattering off a rotating black hole accounting for the neutrino spin precession. Then, we study the evolution of flavor neutrinos, emitted in a supernova explosion, in stochastic gravitational waves. The astrophysical applications of the obtained results are...
An upgraded version of the DGFRS-2 (the Dubna Gas-Filled Recoil Separator-2) analog spectrometer to search for rare ER-α correlated sequence in a real-time mode to suppress radically cyclotron associated background signals is presented. New “flexible” algorithm to operate with new analog spectrometer of the DGFRS-2 installed at DC-280 (the JINR Superheavy Element Factory) cyclotron setup is...
The future MPD experiment at NICA collider is designed to study heavy-ion collisions at $\sqrt{s_{NN}}$ = 4-11 GeV. For this energy range, which corresponds to the highest net-baryon densities and modest temperatures, models predict a first order phase transition from hadronic matter to the new state of matter formed of deconfined quarks and gluons and existence of a critical end point....
In the CDM universe, the Hubble constant is the only cosmological parameter that can be measured both locally and indirectly by traditional cosmological methods like the CMB, baryon acoustic oscillations, supernovae, and big-bang nucleosynthesis. It is also simple to comprehend, and because the error bars are getting so narrow, the CDM model truly depends on it. Everyone awoke as a result of...
The theory of gravitational lensing on straight segments of a single cosmic string (CS) located perpendicular to the line of sight has been studied recently in detail. However, more realistic models necessarily have to include the inclinations and bends of the string. Besides, the recent analysis of observational data on the search for gravitational-lens candidates shows a large number of...
The RED-100 is a two-phase LXe detector designed for searching CEvNS of reactor antineutrino. In 2021 this detector was located on Kalinin NPP, data collection was finished at the beginning of 2022. In this report methods of data processing and analysis, signal correction, event selection, position and energy reconstruction are described. Results of calibration and comparison with simulation...
Particle Identification (PID) is an important part for most of the physics analysis in heavy-ion experiments. The principal challenge for PID is how to provide good identification in a wide range of particle momenta. Different approaches are used to combine observations from various detectors to enrich overall PID capabilities. Hence, PID is a classification task, that is why it can be...
The seesaw mechanism is a popular approach to give a viable explanation for the source of non-zero neutrino mass and for the cause of matter dominance of the Universe - two of the most important open problems that could not be answered in the Standard Model (SM) of Particle Physics. A minimal extension of the SM is studied, incorporating a type-I+II seesaw mechanism with only one right-handed...
We study slow roll single field inflationary scenario and the production of non-thermal fermionic dark matter, together with standard model Higgs, during reheating. For the inflationary scenario, we have considered two models of polynomial potential — one is symmetric about the origin and the other one is not. We fix the coefficients of the potential from the current CMB data from...
An ionization loss simulation in several sequent gaps of the neutron detector is preformed. It is based on the rigid layer converter so as boron-10 or lithium-6 and gaseous chamber. It was shown that the distribution of ionization losses over gas gaps varies significantly depending on the incident neutron energy.The fact can be used to control the energy of the neutron flux using this detector.
This work presents the charge-exchange strength functions S(E) of isotopes 128,130Te. Both experimental data on the S(E) charge-exchange strength functions obtained in (3He, t) reactions and the S(E) strength functions calculated in the microscopic theory of finite fermi-systems are analyzed. The resonance structure of the strength function S(E) is investigated, and the Gamow-Teller and Pygmy...
At present, the primary computational problems in particle physics experiments is the amount
of computing resources to facilitate the slow low level simulation of particles passing through
the detector material.
A promising way to work around this problem driven by the low speed of the full low level Geant4 simulation
is to use a data-driven surrogate generative models instead. Such models may...
In heavy-ion reactions, statistical models predict a rapid change in the baryon-to-meson ratio
as a function of the collision energy. This change occurs when the hadronic medium transits
from a baryon- to a meson-dominated gas. The transition is expected to take place at a
temperature of 140 MeV and a baryon chemical potential of 420 MeV, corresponding to a
collision energy of 8.2 GeV per...
