An overview of recent searches for BSM physics with the ATLAS and CMS experiments is given. A focus is placed on searches with top quarks, in particular searches for top-quark partners. The presented searches use data taken in 13 TeV proton-proton collisions at the LHC with an integrated luminosity of up to 80 fb$^{-1}$.
Several models beyond the Standard Model predict the production of
long-lived particles (LLP). For instance R-parity violating supersymmetry
or hidden valley models allow such production of LLP, defining a lot of
different and non-conventional experimental signatures. We present the
different strategies and recent results to look for these new LLP, using
13 TeV data recorded by both ATLAS...
We intend to study a new class of cosmological models in f(R, T) modified theories of gravity, hence
define the cosmological constant Λ as a function of the trace of the stress energy-momentum-tensor T and
the Ricci scalar R, and name such a model Λ(R, T) gravity where we have specified a certain form of
Λ(R, T). Λ(R, T) is also defined in the perfect fluid and dust case. Some physical and...
The NEVOD-EAS array for the detection of extensive air showers in the energy range 10^15−10^17 eV is being created in MEPhI on the basis of the Experimental complex NEVOD. It is aimed at independent estimations of the size, axis position and arrival direction of EAS registered with other detectors of the complex.
Since the NEVOD-EAS is being created at a densely built territory and detecting...
A four-layer gaseous detector for electrons and other charged particles is developed. A charged particle passing through a thin window produces ionization in four consecutive gas gaps separated by absorbers. The gas gain about of $10^{4}$ allows one to determine four signal amplitudes under the control of any combination of these signals. Simultaneous measurement of the ionization losses of...
We developed a new ring neutron detectors based on ZnS/LiF scintillators and solid-state photomultipliers (SiPM) for powder neutron difractometers. This detector can capture full Sherrer's ring and therefore can provide the most effective regustration of scaterred by sample neutrons. The design of the detector allows completely avoiding blind areas. The developed detectors consisst from...
It is supposed that in a black hole unlike the routine world of coordinate and time are constants, and an impulse and energy are variables. In work some possibilities of driving of a particle of matter in these conditions are considered. For their consideration the principle of ab inititio but not traditional minimization of expression of action through a Lagrangian is used.
In this work at...
The existence of axionlike particles (ALPs) is predicted by many extensions of the Standard Model. ALPs represent very probable and well motivated candidate for the role of dark matter. ALPs may manifest themselves through interaction with photons – particularly, through photon-ALP conversion in magnetic fields. This hypothetical process is able to solve a big astrophysical problem of an...
Modern existing and being developed Cherenkov water detectors for neutrino astrophysics have a cubic-kilometers volume. These detectors are deployed at great depths of water or ice and, in addition to neutrinos, register atmospheric muons with a high energy threshold (hundreds GeV). The energy spectrum of muons with energies above 100 TeV is extremely poorly studied. Knowing the spectrum will...
The perspective space project SOLARIS involves research on board a spacecraft launched at Lagrange L1 point, which should provide long-term continuous complex observations of the Sun in various ranges of the electromagnetic spectrum. The complex of scientific devices developed by NRNU MEPhI is designed to study active nonstationary processes on the Sun in a wide range of X-ray and gamma...
The attachment of electrons to electronegative impurities in condensed phases is the most important process limiting performance of two-phase emission detectors. These impurities are also responsible for some other processes that degrade the efficiency of the detector, such as reducing energy of electrons during drift and absorbing UV radiation. We present a complex method for preparing...
Primary particles of cosmic rays originate in outer space and when they reach the Earth, they cause a series of nuclear reactions with the molecules and particles presented in the Earth’s atmosphere and therefore, lead to the creation of many secondary particles in the form of extensive air showers. By the increase in altitude, the layer of the protective atmosphere being thinner and...
The original ideas of new theory – “Non-Inflationary Cosmology” (NIC) – and its consequences are manifested: 1. Global hierarchy of Bose-Einstein statistics’ (BES) at earliest Universe guarantees the formation of Bose-Einstein condensate in Matter Era (ME). 2. New phenomenon – Cosmological Small-Bang – has been disclosed as a consequence of further phase-transition process from BES to FDS in...
The conducting of physical experiments at large accelerator facilities, of the FAIR (Germany) type requires the provision of readout and processing of signals from a large number of detectors. To solve these tasks there are used complicated electronic units, which are designed as application specific integrated circuits (ASIC). The design process is subject to hard requirements, bound with...
Design approach and structure of an Application-Specific Integrated Circuit (ASIC) for multichannel Gas Electron Multiplier (GEM) detectors are presented. This ASIC is designed for use in tracking and calorimetric systems of large physical experiments such as CBM (FAIR, Darmstadt) and MPD (NICA, Dubna).
The amount of data to be processed by ASIC is related to the channel event rate, ADC...
Possible study of hadron production at small angles with respect to beam
at the Large Hadron Collider (LHC) is being actively discussed now.
Apart from a better understanding of the fundamental QCD processes,
the study of high energy particle production in the forward direction
is an extremely important topic for cosmic ray physics.
Such measurements could remove uncertainties in physics...
Using the Monte Carlo method (GEANT4), energy deposit distributions were obtained for incident gamma photons with energy from $256$ MeV up to $8192$ MeV interacting with the various parts of the spaghetti calorimeter (SPACAL). The SPACAL consists of nine scintillation single crystal gallium-gadolinium garnet (GGG) rods with dimensions $3\times3\times100$ $\text{mm}^3$ forming a $3\times3$...
Dissipative interactions between neutrinos and the environment in which they propagate lead to quantum decoherence. Such an environment is predicted by quantum gravity models featuring a 'foamy' space-time structure. Environmental decoherence degrades the interference between neutrino states that is responsible for neutrino oscillations, resulting in exponential damping of oscillation...
Using back tracing we research galactic cosmic ray propagation in a moving magnetic cloud having the shape of magnetic loop. It is obtained that the inductive electric field of an extended magnetic cloud decreases particle energy. Both energy losses and long particle trapping by a magnetic loop produce Forbush decrease. The calculation results of particle density and the components of uni- and...
The possibility of generating and detecting high-frequency gravitational waves based on parametric optical processes in dielectric media at their excitation by intense laser radiation of visible or ultraviolet ranges is analyzed. The theory predicts the feasibility of the Hertz gravitational laboratory experiment in which the parametric conversion of intense laser pulses with frequency ω0 to a...
Higgs boson production cross-sections via the gluon–gluon fusion and vector-boson fusion modes are measured in the $H \rightarrow WW^{*}\rightarrow е\nu\mu\nu$ decay channel in the ATLAS experiment at the LHC. The $H \rightarrow WW^{*}$ decay channel has the second largest branching fraction and allows to measure Higgs boson production cross-section with good precision. The analysis is based...
The High Altitude Water Cherenkov (HAWC) observatory is a wide-field-of-view (2sr) and high duty cycle (>95%) gamma-ray detector array, which is sensitive to gamma rays from 500 GeV - 100 TeV. HAWC operates at an altitude of 4100 meters in the state of Puebla, Mexico, since HAWC observes 2/3 of the sky 24 hours a day, it is a well-suited instrument to perform indirect dark matter searches by...
During the development of large fast scintillation detectors with silicon photomutipliers (SiPM) for the satellite based gamma-ray telescope GAMMA-400, the properties of the SiPM allowed to measure the number of photoelectrons detected. The minimum of photoelectrons detected is calculated for effective particles selection. The functions of the detector response to SiPM with a different number...
We study the properties of a certain class of solutions of a relativistic model with the logarithmic nonlinearity. We show that such a model have two types of solutions: topologically trivial (gaussons) and topologically non-trivial (kinks). For the kink-antikink scattering, we have found a critical value of the initial velocity $v_\mathrm{cr}$, which separates two different scenarios of...
During the upcoming Long Shutdown 2 the accelerator complex at CERN will implement significant improvements to the performance of the collider including the increase of the luminosity such that it is expected a sustain interaction rates up to 1MHz for p-p collisions and 50 kHz for Pb-Pb collisions. In order to remain operational during the Run 3 and Run 4 ALICE has to upgrade many of its...
Detectors based on organic scintillators are widely used in the tasks when fast neutrons in the presence of gamma radiation are necessary to detect. Such tasks are control of spent nuclear fuel, measurement of the yield of fast neutrons from neutron generators, monitoring of neutron and gamma background in underground low-background experiments (neutrino and dark matter detectors), and...
A search for resonant absorption of the solar axion by $^1$$^6$$^9$Tm nuclei will be performed using the Tm-containing bolometers installed inside the low-background setup at the underground laboratory. The thulium crystal Tm$_3$Al$_5$O$_1$$_2$ have been grown and tested for the first time as a bolometric detector. The expected sensitivity of 1 kg Tm-bolometer to axion-photon g$_A$$_γ$ and...
We analyze observational signatures that may arise from a cosmological epoch corresponding to the simple harmonic universe, which consists of positive curvature, a negative cosmological constant, and one or more matter sources with an intermediate equation of state, which then tunnels and/or evolves into inflation and radiation-dominated eras. We find that the effects on the cosmic microwave...
In our previous publications [1–3] we have discussed new original effect appeared at crossing of the metal foils by fission fragments (FFs). We have observed significant mass deficit in the total mass Ms of the FFs detected in coincidence with ions knocked out from the foil. In series of the recent more detailed experiments we have compared event by event the mass of the FF before (Mtt) and...
For the experiments with irradiation of cylindrical targets by intense ion beams which are actual in some fundamental and applied researches (laboratory astrophysics, medicine, etc) it is necessary to shape the irradiating beam with hollow geometry. Among the various methods of hollow beam formation the wobbling is of interest. The deflecting plates or RF-cavities with phase shift of...
Elementary particle processes in the extreme astrophysical conditions, such as strong magnetic fields, require knowledge of the exact propagators. There are known expressions for the propagators of scalar, Dirac and massive vector fields in the presence of the constant magnetic field both in the coordinate and in the momentum spaces. In general they require either following the tedious...
The Compressed Baryonic Matter (CBM) experiment at the future Facility for
Antiproton and Ion Research (FAIR) aims to study the properties of nuclear
matter at high net-baryon densities and moderate temperatures.
The Silicon Tracking System (STS) is the key detector to reconstruct with
a high efficiency up to 1000 charged particle trajectories created in heavy-ion
collisions at interaction...
Measurements of the directed and elliptic flow of strange and multi-strange hadrons are an important part of the physics program of the Compressed Baryonic Matter experiment (CBM) at the future accelerator complex FAIR in Darmstadt, Germany. It was shown recently by studies from the RHIC BES program that $dv_1/dy|y=0$ and the difference between $v_2$ of particles and antiparticles in the...
The Compressed Baryonic Matter experiment (CBM) at FAIR aims to study the QCD phase diagram at high net baryon densities and moderate temperatures using collisions of heavy ions at center-of-mass energies of a few GeV per nucleon. Anisotropic transverse flow is among the key observables to study the properties of matter created in such collisions.
The CBM performance for anisotropic flow...
In this talk the phase structure of the dense baryonic/quark matter has been investigated in the presence of baryon, isospin, chiral and chiral isospin chemical potentials in the framework of Nambu--Jona-Lasinio model. It has been shown that in the large-Nc limit there exist several dualities of the phase portrait. One of the key conclusions of our studies is the fact that chiral imbalance...
To apply force-free magnetic field models we present and discuss properties and feathers of the following models: Miller and Turner solution, modified Miller and Turner solution, Romashets and Vandas solution, Integral model, Krittinatham and Ruffolo model. These models can be used to interpret in-situ observations of the magnetic flux rope, study Forbush decrease in magnetic clouds or...
Supersource of ultracold neutrons on the basis of superfluid helium is under construction in PNPI NRC KI. It must provide UCN density 2-3 orders of magnitude
higher than existing sources. For the new source we propose an experiment on search for neutron–antineutron oscillations based on the storage of ultracold neutrons in a material trap. The sensitivity of the experiment mostly depends on...
We investigate the processes of radiative transitions of electrons between the Landau levels, $e_{(\ell)} \to e_{(n)} + \gamma$, in a moderately strong magnetic field. Under such conditions, it is necessary to take into account transitions in which both the initial and final electrons can be in states corresponding to arbitrary Landau levels. The results obtained can be used in calculating the...
Abstract. The pixel recovery time of the Hamamatsu SiPM linear assembly was measured. The assembly contains eight SiPMs of 2.8 mm active area diameter; pixel size is 15 x 15 mkm2. The assembly is used in calorimeters of the CMS experiment.
The measurements were made for two groups of pixels: 49 and 17 pixels. Recovering time was found as 7 ns and 6 ns respectively.
The amplifier of 40 db and...
The exact Reissner-Nordstr\"om solution of the Maxwell and Einstein equations corresponding the electromagnetic field configuration
localized in the region with the range of about $10^{-34}$ cm is considered as a model for the classical electron. It is shown that in
the tetrad representation, in spite of singularities of the electromagnetic and gravitational fields, there are solutions with...
The TUS experiment is designed to investigate the ultra high energy cosmic ray (UHECR) at energy ~ 100 EeV from the space orbit by the UV radiation measurement of extensive air showers (EAS). It was launched on board the “Lomonosov” satellite from the Vostochny Cosmodrome on April 28, 2016 for 5 years of data taking. It is the first orbital telescope aimed for such measurements. The main mode...
The inside energy content of the extended particle obeys Umov’s estimate of 1873 mc^2/γ ≈ mc^2 (1-0.5β^2) ≤ mc^2 under low velocities despite γmc^2 ≈ mc^2 (1+0.5β^2) ≥ mc^2 for the total kinetic energy. Geodesic auto-accelerations in mechanics / gravitation of nonlocal energy fluxes drive the probe body toward equipartition of kinetic energies of inside chaos, mc^2/γ, and its ordered...
Simulation of Gamma-400 calorimeter physical characteristics with considering processes of generation, propagation and detection of optical photons in scintillation crystal was performed using Geant4 toolkit with G4OpticalPhoton library, which contains the characteristics of processes with participation of optical photons and its processing procedures. Including of optical processes into...
There are several problems in the numerical simulation of jets of young stars: the results of calculations depend very much on the initial conditions, most of which are unknown from observational data. Analytical approaches, based on the solution of the Grad-Shafranov equation, can only provide a stationary one-dimensional picture of what is happening.
The purpose of this work is to combine...
Detectors consisting of a high Z converter and a hodoscope type particle detector behind it are often used in HEP experiments for e,γ/hadron and γ/π0 separations and for e,γ coordinate and energy measurements. The most popular converter materials are Pb and W, while Fe or Cu are used less frequently. The converter thickness is often close to tmax that corresponds to the maximum flux of charge...
Associated Higgs boson production in pp collisions can be a powerful tool for searches for CP violation in the Higgs sector. In this study we analyze CP sensitive observables constructed for a four lepton final state. It is shown that azimuthal angle distributions of leptons in this process demonstrate a strong sensitivity to CP violation at the current limits on Higgs boson coupling...
Primordial black holes (PBH) attracted particular attention last time. They are possible candidates not only to dark matter, but to supermassive black holes, gravitational waves events from black hole merger and others. However, recently there appeared constraints on PBH abundance from different observations (including those from gravitational microlensing). The present work is devoted to the...
We consider a model of $OHe$ atomic dark matter formed by Coulomb binding of the stable double charged massive $O^{--}$ particles with nuclei of primordial helium. Such dark matter can be captured by ordinary matter forming superheavy nuclei. We discuss $O$-nuclearites formed by multiple capture of $O^{--}$ particles by heavy nuclei and effect of accumulation of $OHe$ atoms in stellar evolution.
Prototype detector based on long BC-408 scintillators with SiPM readout for space-based gamma-telescope GAMMA-400 was tested in 100-300 MeV secondary positron beam of synchrotron C-25P «PAKHRA» of Lebedev Physical Institute. The measurement setup, design concepts for the prototype detector and chosen solutions together with some test results are discussed.
Considered the numerical simulation technique which providing optimum beam parameters at the transport channel output of electron accelerator. The KATRAN channels design environment used for this purpose has a modular structure includes the basic beam focusing blocks. This allows enabling create and configure the optical system of the accelerator fast and efficiently if a given topology of the...
The gamma-quanta background count rate model in the energy range from 0.1 MeV up to several MeV for high inclination satellites is presented. The AVS-F instrument (Amplitude-Time Spectrometry of the Sun) was installed onboard the specialized automatic station CORONAS-F functioning in time interval since July, 2001 up to December, 2005 on the orbit with initial parameters: altitude ~500 km,...
strong text The four-dimensional non-stationary model of a bunch of the particles interacting with own field is studied. For the description of behavior of a bunch the "Meshchersky's integral" allowing to give completely self-consistent kinetic description in 8-dimensional phase space is used. In the considered task the self-coordinated potential determines interaction forces in...
For Jiangmen Underground Neutrino Observatory the requirements < 1 % energy scale uncertainty and 3 % at 1 MeV energy resolution are crucial in order to determine neutrino Mass Hierarchy. Several effects determine the energy scale and response function of the detector. To measure two of them, ionization quenching and intrinsic energy resolution, small-scale laboratory setup was developed....
Expected energy spectra calculations for large volume liquid scintillation detectors to inverse $\beta$-decay for anti-neutrinos produced by $^{144}$Ce - $^{144}$Pr artificial source have been performed.
The calculations were carried out through Monte-Carlo method within GEANT4.10 framework and were purposed to search for neutrino oscillation to sterile eigenstate.
The analysis of relative...
In this talk the description of possible realisation of NLO Mateix Element Method is presented and probed with the Higgs boson decays. The comparison of LO and NLO approaches is demonstrated and the separation power of each approach is estimated.
The experiment was done to study $^{11}$B($^{3}$He,d)$^{12}$C reaction with energy E($^{3}$He) = 25 MeV.
The aim of the experiment is to determine the properties of $^{12}$C states at high excitation energies and in particular to verify which of the conflicting spin-parity assignments of the 13.35 MeV state (2¯ or 4¯) is consistent with the data and optical model predictions.
The...
Preliminary results of measurements of the total reaction cross sections σR for weakly bound 4He, 6He, 8He, 7Li, 8Li, 9Li, 11Li, 7Be, 9Be, 10Be, 11Be, 12Be, 8B, 10B, 11B and 12B nuclei at energy range (10-45) A MeV with 28Si and 181Ta target are presented. The secondary beams of light nuclei were produced by bombardment of the 15N (50 A MeV) primary beam on Be target and separated by COMBAS...
We calculate two-loop massless correlator $G(n_1,n_2,n_3,n_4,n_5;x,y;D)$ of two composite vertexes with Bjorken fractions $x$ and $y$, arbitrary indices $n_i$, and arbitrary space-time dimension, $D$. A closed-form expression for this two-loop kite Feynman diagram with composite vertexes is given in terms of a twofold hypergeometric series. In some special cases it reduces to a sum of...
In the light of the latest data by LHCf collaboration of the LHC on leading neutrons spectra it is possible to obtain total pion-proton cross-sections in the TeV energy region. In this work the exact extraction procedure is shown. Final numbers for the pion-proton cross-section are collected at several different values of the colliding energy and compared with some popular theoretical...
In last few years, several cosmologists have been used different equation of states (EOS) (namely, Phantom energy, generalized Chaplygin gas, Vander Walls quintessence EOS etc ) to explain the present accelerated expansion of the Universe. By using the same EOS, some theoretical physicists have been trying to construct traversable wormholes. Recently, Ananda and Bruni...
Приводятся результаты поиска событий, регистрируемых детектором LVD, совпадающих с гравитационными сигналами от источников GW150914, GW151226, GW170104, GW170608, GW170814 и GW170817.
Single-channel compact noise-proof spectrometer (Ø 5х10 mm) is based on the absorption filter method. Spectrometer is an assembly of thermoluminescent detectors made of lithium fluoride LiF, that are placed one after another, which are also used as filters for X-ray spectrum selection. Spectrometer has been developed for measuring X-ray spectra of micropinch-discharge plasma in the energy...
The top quark is the heaviest elementary particle in the Standard Model, and has an
expected Yukawa coupling of order unity. The value of this coupling is a key ingredient to unravel the nature of the observed Higgs boson. The only known process which has a direct sensitivity to this coupling is the production of a Higgs boson in association with a top quark-pair ($t\bar{t}H$). This talk will...
For thousands years of human evolution we were curious about what the Sun is? Answers began to come during recent 50 years, thanks to development of astrophysics and helioseismology, particle and neutrino physics. The latter research field allows studying the Sun's deep interior and achieved enormous progress during last ten years. This period of Sun's studies is marked by the operation of the...
Some experiments in high energy physics require precision measurement of some process count rate.In those cases one usually just divides the number of events over measurement time. Time information for the events is seldom not used. In this report we discuss few techniques to use time of event arrival to search for anomalies in events and significantly reduce some systematic errors.All...
Effective magnetic moment of solar neutrinos is constrained using a 1291.5 days dataset of Borexino Phase-II. The sought-for effect from electromagnetic neutrino interaction is the contribution to the low-energy part of the $\nu-e$ scattering cross section affecting the shapes of the electron recoil spectra. Spectral fit of the solar neutrino data leads to the limit of...
The report deals with measurements of electron bunch length using coherent backward transition radiation generated by a bunch in a gold target. Such bunches are used in novel compact laser- based acceleration. The aim is to compare efficiently non-polarized and polarized photons backward transition radiation for use in measurement of longitudinal size electron bunch. By calculation, it was...
This presentation shows the observation of the decay of the Higgs bosons to b quark-antiquark pairs by the ATLAS experiment. The analysis presented includes datasets recorded in LHC Run-1 and Run-2. ttH, VBF and VH production modes analyzed to extract the signals are discussed.
Data on the measurement of the flux of atmospheric muons by a scintillation detector LVD at 3300 m w.e. depth with an average energy of 280 GeV are presented. The results of measuring the seasonal variation of the muon flux over 25 years of observations are discussed.
The new Fast Interaction Trigger (FIT) [1] was developed for the upgrade of the ALICE detector [2] at CERN LHC. FIT will consist of two arrays of Cherenkov radiators (T0+) and a large segmented scintillator ring (V0+). FIT will serve as the main luminometer, as well as the detector which will determine collision time, multiplicity, centrality, and reaction plane in ALICE during Runs 3 and 4....
The SNO+ collaboration has upgraded the SNO detector to pursue a wide range of physics goals, which will be achieved in three distinct phases. In the ongoing water phase, a search for invisible nucleon decays with expected lifetime sensitivities as high as $10^{28}-10^{30}$ years is being conducted. In the upcoming scintillator phase, the increased light yield will lower the energy threshold,...
The Inner Tracking System (ITS) plays a key role in the precise determination of secondary vertices in high energy hadron collisions in ALICE at the LHC. The beam luminosity of the collider will be increased by more than 10 times after the upgrade planned in 2020. This will provide new possibilities of studies of rare processes in high energy hadron collisions including production of...
FCC-hh is a proposed future energy-frontier hadron collider, which goal is to provide high luminosity proton-proton collisions at a centre-of-mass energy of 100 TeV. The FCC-hh has an extremely rich physics program ranging from standard model (SM) measurements to direct searches for physics beyond the standard model (BSM). Among processes sensitive to new physics are Flavour-Changing Neutral...
The characteristics of the calibration quasi-monochromatic beam of secondary electrons of the accelerator S-25R “PAHRA” of the P. N. Lebedev Physics Institute of Russian Academy of Sciences based on the magnet SP-57 are presented. The energy resolution of the beam from a copper converter in the thickness range of 0.1 - 5 mm and the interpolar gap of the magnet 6 cm in the energy range of the...
The IceCube neutrino observatory uses a cubic km of deep South Pole ice instrumented with over 5000 optical sensors to detect Cherenkov light produced by astrophysical and atmospheric neutrinos interacting in the ice. The detector probes neutrino energies from GeV to PeV, propagation distances ranging from a few km to astrophysical scales, and collects high statistics neutrino samples due to...
The application of the platform MICRO TCA standard in physical experiments. Chassis and specialized modules for data acquisition systems. Data storage and transmission systems developed by a Russian company. Construction of distributed systems for data collection and control of physical experiments with the use of Micro-TCA platforms.
One of the best ways for investigations of VHE muons spectrum is measuring the spectrum of stochastic energy losses (cascades). IceCube is the world’s unique detector capable of measuring the cascade spectrum in the energy region of tens TeV – one PeV where manifestation of prompt muons is predicted. In events with muon bundles, the longitudinal energy deposit profile reconstructed by means of...
Core-collapse supernovae emit about 99% of their gravitational energy in a burst of neutrinos. This signal carries precious information about the processes inside the collapsing core as well as neutrino properties.
The large liquid scintillator detectors used by the NOvA experiment provide a possibility to detect such a signal. A dedicated trigger system was developed to perform a search for...
Authors: E.S.Kozlova on behalf the NEST collaboration
The Noble Element Simulation Technique (NEST) is a comprehensive mostly-empirical standalone package for complete and accurate simulation both the scintillation light and ionization yields of noble elements for many particle types (nuclear recoil, electron recoil, Kr83, alphas, etc.). Instead of NEST v.1.0, v.2.0 could fully work both as...
Many supersymmetric scenarios feature final states with non-standard final state objects. The production of massive sparticles can lead to the production of boosted top quarks or vector bosons, high-pt b-jets. At the same time, transitions between nearly mass-degenerate sparticles can challenge the standard reconstruction because of the presence of very soft leptons or jets. The talk will...
Construction of the advanced megascience facilities, basing on advanced particle detector technologies, is closely connected with development of read-out electronics, having as a core element – application specific integrated circuit (ASIC).
In order to reach limit specifications of multichannel detector setups a whole set of factors defines ASIC design. Today application specific chips...
The Earth thermal flux value lays in wide region from 50 up to 250 TW according to number of estimations. Upper limit could be achieved only if potassium abundance in the Earth exceeds 2%. In Borexino data the valley between beryllium neutrinos and 11C spectrum is filled with betas from 210Bi. But it also contains CNO neutrinos. CNO cycle in the Sun could be depressed according to last...
The multiplicities of light (anti)nuclei were measured recently by the ALICE collaboration in Pb+Pb collisions at the center-of-mass collision energy $\sqrt{s} =2.76$ TeV [1]. Surprisingly, the hadron resonance gas model (HRGM) is able to perfectly describe the their multiplicities [2] under various assumptions. For instance, one can consider the (anti)nuclei with a vanishing hard-core radius...
An Electron-Ion Collider (EIC) in USA is currently discussed as a next-generation facility for high-energy nuclear physics. The main goal of the EIC is to study fundamental questions of Quantum Chromodynamics, which include the origin of the nucleon mass and spin and the three-dimensional structure of the nucleon in terms of quarks and gluons, the emergent properties of dense systems of...
I will briefly review the double beta decay experiments using scintillating mono crystals at low temperature, such as CUPID and AMoRE experiments.
The status of AMoRE experiment for Mo-100 double beta decays will be described in detail.
Neutrinos are the only fundamental fermions without electric charge. Consequently, they might be identical to their own anti-particles (Majorana type). In this case neutrinoless double beta decay should exist where a nucleus (A,Z) decays to (A,Z+2)+2e-, i.e., Lepton number is not conserved. There are a variety of experiments searching for this decay using very different experimental concepts...
In this talk we address two important issues which could affect reaching the exponential and Kasner asymptotes in Einstein-Gauss-Bonnet cosmologies -- spatial curvature and anisotropy in
both three- and extra-dimensional subspaces. In the first part we consider cosmological evolution of spaces being the product of two isotropic and spatially curved subspaces. We consider all possible
number of...
An experiment for measuring the flux of cosmic gamma rays with energy above 100TeV is currently being prepared at the Baksan Neutrino Observatory of the Institute for Nuclear Research, Russian Academy of Sciences. At present the plastic scintillation counters with a total continuous area of 410m^2 are installed in the muon detector (MD) underground tunnels, and they are totally equipped with...
Machine learning methods are widely used in the LHCb experiment at every stage of data processing. This talk will cover some of the established applications of machine learning, such as the classification and selection of interesting events in triggering and offline analysis of the data, such as particle identification, unbiased offline characterization of reconstructed events, tracking, and...
Current gamma-ray and cosmic-ray satellite experiments employ plastic scintillators to discriminate charged and neutral particles and to identify nuclei .
Scintillators are commonly read out using the classical photomultiplier tubes (PMTs).
Recent measurements and R&D projects are demonstrating that Silicon Photomultipliers (SiPMs) are suitable for the detection of fast light signals with...
We investigate the Universe evolution at late-time stages in models of teleparallel gravity with power-law nonminimal coupling and a decreasing power-law potential of the scalar field $\phi$. New asymptotic solutions are found analytically for these models in vacuum and with a perfect fluid. Applying numerical integration, we show that the cosmological evolution leads to these solutions for...
In the Standard Model the three charged leptons are identical copies of each other, apart from mass differences, and the electroweak coupling of the gauge bosons to leptons is independent of the lepton flavour. This prediction is called lepton flavour universality (LFU) and is well tested in tree level decays; any violation of LFU would be a clear sign of physics beyond the Standard Model....
The new coordinate-tracking detector based on drift chambers (CTUDC) is developed in MEPhI. The detector represents two planes with total area of 30 m2 placed on opposite sides of Cherenkov water detector of 2000 m^3 volume. Each plane consists of 8 large multiwire drift chambers (4000x508x112 mm^3). The key advantages of these chambers are a large effective area (1.85 m^2) and a good...
Precision measurements of CP violating observables in hadron decays are powerful probes to search for physics effects beyond the Standard Model.
The most recent results on CP violation in decays of mesons and baryons obtained by
the LHCb Collaboration will be presented, some of which are world-first measurements.
In particular results obtained exploiting the data collected during the Run 2 of...
The meaning of the wave function of the Universe was actively discussed in 1980s. In most works on quantum cosmology it is accepted that the wave function defines the probability amplitude for the Universe to have some space geometry, or to be found in some point of the Wheeler superspace. It seems that the wave function gives maximally objective description compatible with quantum theory....
DANSS is a one cubic meter highly segmented solid scintillator detector. It consists of 2500 scintillator strips, covered with gadolinium loaded reflective coating and read out with SiPMs via wavelength shifting fibers. DANSS is placed under a 3 GW industrial reactor at the Kalinin NPP (Russia) on a movable platform. The distance from the reactor core center is varied from 10.7 m to 12.7 m...
Liquid Argon Time Projection Chambers (LAr TPCs) are ideal detectors for neutrino experiments, providing both particle track imaging and calorimetry in a dense medium. The sensitivity required by future neutrino physics implies unprecedented detector masses, for which traditional LAr TPC designs face challenges e.g. due to the long drift distances of O(10m). In order to efficiently drift...
Daya Bay was the first experiment to unambiguously measure a non-zero value of the $\theta_{13}$ mixing angle and the first reactor experiment to measure the $\Delta m^2_{32}$ mass splitting. The experiment includes eight identically designed detectors and six nuclear reactors at baselines ranging from 0.5 km to 1.6 km. A data set of nearly 4 million events has been collected over 1958 days...
f(R) gravity with higher derivatives are represented in terms of the chiral cosmological models. Symmetries of a chiral space of obtained models are studied. Examples of exact solutions are found and diccassed.
Motivated by recent V.A. Nikitin's reports on observation of 9-MeV$/c^2$
charged particles with a 2 meter JINR propane bubble chamber we perform an
experiment at the LPI electron synchrotron "Pakhra" with the aim to detect
such particles in the Bethe--Heitler process. Theoretical limits for masses
of new light charged particles of spin 0, 1/2 and 1 arising from precise
data on the muon...
The RED100 is a two-phase emission liquid xenon detector to search for rare events such as coherent elastic neutrino nucleus scattering (CEνNS) and neutrinoless double positron decay ( 0ν2β+). To detect these processes detector was specially built to work at ground level laboratory with intensive muon background.The RED100 experimental setup consists of several systems that provide stable...
T2K is a long-baseline neutrino oscillation experiment based in Japan. A muon neutrino (or antineutrino) beam is produced at JPARC and sent 295 km to the Super-Kamiokande detector where neutrino oscillation is studied via muon neutrino disappearance and electron neutrino appearance channels. Such studies have demonstrated muon neutrino to electron neutrino oscillation and provide precision...
We consider cosmological perturbations in the theory of gravity with nonminimal kinetic coupling. The Lagrangian of the theory contains the term $\zeta G^{ij}\phi_{,i}\phi_{,j}$, and represents the particular example of a general Horndeski Lagrangian, which results in second-order field equations. We derive a complete set of equations for scalar and tensor pertubations. The scalar and tensor...
A new method of high-energy gamma ray incident direction reconstruction is
developed for gamma-ray detectors with multilayered converters. The method uses
data from converter and, if available, from position-sensitive calorimeter to
reconstruct an electromagnetic cascade axis and to determine the incident direction
of a primary gamma. For the first time to find point of intersection of...
The decay K+→π+νν, with a very precisely predicted branching ratio of less than 10-10, is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at CERN SPS is designed to measure the branching ratio of the K+→π+νν with a decay-in-flight technique, novel for this channel. NA62 took data in 2016, 2017 and another year run is...
Several thousands of gamma-ray bursts were observed by various experiments, but their sources of origin still remain unclear up to now. During several GRBs very high-energy photons were detected both in space and ground-based experiments (up to some tens of GeV and up to some TeV, respectively).
The GAMMA-400 project will be the new generation of satellite gamma-observatory. Three apertures...
A proposal for an experiment on a 2-zone gallium target of a solar Gallium-germanium neutrino telescope in the Baksan neutrino Observatory of the INR RAS with a source of 65Zn for short baseline neutrino oscillations search is considered. The possibilities of determining the parameters of oscillations, the necessary characteristics of the neutrino source, the possibility of its production and...
The idea of a cosmological attractor is based on the observation that in many models the kinetic term in Jordan frame practically does not affect the slow-roll parameters during inflation. In the case of many scalar fields, the use of this observation gets a possibility to construct a one-field inflationary model that approximates the original multifield model. In the talk, the examples of...
Tau neutrino properties are not so well known in comparison to those of muon or electron neutrinos. The tau neutrino interaction cross-section was only measured by the DONUT experiment in 2008 with a large systematical error of 50% due to a poor knowledge of the tau neutrino flux in this beam dump experiment. However, the better measurement of this cross section is needed for the planned ...
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double beta decay (0νββ) that has been able to reach the one-ton scale. The detector consists of an array of 988 TeO2 crystals arranged in a compact cylindrical structure of 19 towers. The construction of the experiment was completed in August 2016 with the installation...
A.S. Barabash
NRC “Kurchatov Institute”, Institute of Theoretical and Experimental
Physics, B. Cheremushkinskaya 25, 117218 Moscow, Russia
This report reviews of modern double beta decay experiments. Results of the most sensitive current experiments are discussed. The main attention is paid to KamLAND-Zen, EXO, GERDA-II, MAJORANA-DEMONSTRATOR, CUORE and CUPID-0...
According to some theoretical models a new dark matter gauge boson A' (dark photon) might exist, possibly coupled with ordinary photon by different(non-gravitational) type of weak interaction. The NA64 experiment at CERN SPS accelerator is aimed at probing an unexplored parameter space of kinetic gamma-A' mixing strength and mass values of A'. Experiment utilizes 100 GeV electron beam and the...
Nature of the Dark Matter is one of the most fundamental physics problems. While practically all currently running Dark Matter experiments yield no positive result the DAMA/LIBRA collaboration continues to claim observation of the Dark Matter signal in the NaI(Tl) detector located deep underground. The new data released from the DAMA/LIBRA phase-2 experiment favors presence of a modulated...
The graviton-to-photon conversion effect in a magnetized relativistic lepton plasma is considered. This effect can be important for the possible generation of electromagnetic radiation accompanying coalescence of relativistic compact neutron star -- black hole binaries. The relativistic electron-positron plasma can be generated near the surface of a rotating magnetized neutron star (a radio...
Abstract: The Compact Linear Collider (CLIC) is a proposed
high-luminosity linear electron-positron collider at the energy
frontier, designed to be built near CERN, Geneva. To maximize the
physics potential of CLIC a staged approach is adopted with three
distinct energy stages currently assumed to be 380 GeV, 1.5 TeV and 3
TeV. The initial energy stage is optimized for the precise...
In the framework of Multiple Point Principle (MPP), where the existence of the two degenerate vacua of the Universe: the first, ElectroWeak vacuum with $\approx 246$ GeV ("true vacuum"), and the second at Planck scale $\sim 10^{18}$ GeV ("false vacuum"); we investigated the gravitational black-hole-hedgehog's solution with magnetic field contribution in the GraviWeak unification model...
Neutrinoless double beta decay is a hypothetical nuclear transition which if observed will allow to establish Majorana nature of neutrino, determine the absolute neutrino mass and the neutrino-mass hierarchy, to verify the lepton number violation and possible contribution of right-handed admixture to weak interaction, help to test leptogenesis, existence of Nambu-Goldstone bosons (majorons)...
The AE$\mathrm{\overline{g}}$IS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) is a CERN based experiment aiming to probe the Weak Equivalence Principle of General Relativity with antimatter by studying free fall of antihydrogen in the Earth's gravitational field.
A pulsed cold beam of antihydrogen produced by charge exchange between Rydberg positronium and cold antiprotons...
Search for parameter modification of neutral light mesons in nuclear matter in Hyperon-M experiment at U-70 accelerator
Sergey Evdokimov et al. (Hyperon-M experiment)
Hyperon-M at U-70 accelerator in Protvino is fixed-target experiment for study of parameter modifications of neutral light
mesons produced in meson-nucleus interactions on different nuclear targets. On the base of collected...
During several years at the Baksan Neutrino Observatory INR RAS is undergoing the experiment for searching of 2K (2$\nu$)-capture in $^{124}$Xe. This isotope has several advantages: 1) it has the largest kinetic energy of transition Q – 2.866 MeV, among candidates of nuclei for which predicted the existence of ECEC; 2) since xenon is the noble gas, then it could be easily use as a system...
The cosmological dynamics of a non-locally corrected gravity theory, involving a power of the inverse d'Alembertian, is investigated. Casting the dynamical equations into local form, the fixed points of the models are derived, as well as corresponding de Sitter and power-law solutions. Necessary and sufficient conditions on the model parameters for the existence of de Sitter solutions are...
Abstract. M.Yu. Bogolyubsky, A.A. Volkov, D.K. Elumakhov, A.A. Ivanilov, A.Yu. Kalinin, A.N. Krinitsyn, V.I. Kryshkin, N.V. Kulagin, D.I. Patalakha, K.A. Romanishin, V.V. Skvortsov, V.V. Talov, L.K. Turchanovich
“Comparisom of the Measured Invarinat Cross Sections with Model Predictions for Production at Zero Angle of Secondary Light nuclei in CC-collisions at Beam Energy 20.5 GeV/n on...
The KArlsruhe TRItium Neutrino (KATRIN) experiment aims to make a model-independent determination of the active electron antineutrino mass with an upper limit of 0.2 eV/c2 from the analysis of Tritium beta-spectrum shape near the endpoint. Experimental set-up is fully assembled and undergoes multiple tests. Small amount of Tritium molecules were injected at June 2018 and first spectra were...
The Super Charm–Tau factory at the Budker Institute of Nuclear Physics (Novosibirsk, Russia) is an electron-positron collider that will operate in the center-of-mass energy range from 2 to 5 GeV with the peak luminosity of about
$10^{35}$ cm$^{-2}$s$^{-1}$. The main goal of experiments is to study processes with $c$ quark or $\tau$ leptons in the final state.
We'll discuss the physics case...
Mathematical modeling of gravitating configurations of physical fields is one of the priority directions of the modern theory of gravity. Most of the exact solutions constructed within the framework of the general relativity are static or stationary configurations. This is due to the objective complexity of solving the Einstein equations under the assumption of nonstationarity. We present an...
A review of experiments aimed on detection and study of the recently discovered process of coherent elastic neutrino-nucleus scattering (CEvNS) is presented.
A.A. Bogdanov1, V.A.Chetvertkova4, V.P. Ladygin3, V.V.Mochalov1,2, M.B. Nurusheva1, V.A. Okorokov1, P.A.Semenov,1,2, A.N.Vasiliev1,2,
L.S.Zherebtsova1,2
- National Research Nuclear University (Moscow Engineering Physics Institute), Moscow, 115409, Russia
- NRC «Kurchatov Institute» - IHEP, Protvino, Moscow region, 142281, Russia
- Joint Institute for Nuclear Research, Dubna, Moscow...
The Nuclotron-based Ion Collider fAcility (NICA) is a new accelerator complex being constructed at the Joint Institute for Nuclear Research (JINR). The general objective of the project is to provide beams for the experimental study of hot and dense strongly interacting QCD matter. The heavy ion programme includes two planned detectors: BM@N (Baryonic Matter at Nuclotron) – a fixed target...
The asymmetry of baryon/antibaryon production has been measured in many proton-proton, pion-proton and electron-proton experiments. In the framework of Quark-Gluon String Model the energy dependence of asymmetry tells us about the value of \alpha_{SJ}(0), the intercept of String Junction Regge trajectory. This object (SJ) transfers the baryon charge from proton projectile into the central...
We consider spherically symmetric black holes with minimally coupled scalar fields and concentrate our attention on asymptotically flat self-gravitating configurations having the event horizons located at radii much smaller than 2M. We think of such configurations as rigorous mathematical models of the gravitating objects, surrounded by dark matter, at the centres of normal galaxies. In...
The goal of the COHERENT collaboration is to observe coherent elastic neutrino-nucleus scattering (CEvNS) using different target nuclei and detector technologies. The talk focuses on the ongoing experimental effort and plans following the first observation.
The WWR-M reactor at NRC «Kurchatov Institute» - PNPI is going to be equipped with an high-density ultracold neutron source. Method of UCN production is based on their accumulation in the superfluid helium at 1.2K temperature. Thus, the source will provide the UCN density at EDM spectrometer equals to ρ= 1.3E4 n/cm3 which is 2 order magnitude greater than the output density of...
Review of the recent and future projects for direct observations of the nearest supermassive black hole Sgr A* at the Galactic Center. The primary purpose of these projects is a verification (or falsification) of the General Relativity theory in the strong field limit by means of comprehensive investigations of the shadow and the nearest environment of the event horizon of this black hole.
All known solutions to the Einstein equations describing rotating cylindrical wormholes lack asymptotic flatness and therefore cannot describe wormhole entrances as local objects in our Universe.To overcome this difficulty, wormhole solutions are joined to flat asymptotic regions at some surfaces $\Sigma_-$ and $\Sigma_+$. The whole configuration thus consists of three regions, the internal...
The CALICE collaboration develops and tests highly granular calorimeter prototypes for future collider experiments. Scintillator-SiPM-based prototype of the ILD hadron calorimeter was tested with steel and tungsten absorbers using single-particle beams from the CERN SPS. The results of beam tests are presented as well as an application of the software compensation technique for energy...
The NEVOD-EAS air shower array is being created in MEPhI in frames of the Russian-Italian collaboration NEVOD-DECOR. The installation is aimed at independent estimations of the size, axis position and arrival direction of extensive air showers (EAS) registered with other detectors of the Experimental complex NEVOD. This information will provide calibration of two novel perspective techniques...
The long baseline neutrino experiments T2K has obtained a first hint on CP violation in neutrino oscillations and excluded CP conservation at the 95% confidence level. To strengthen this result the T2K collaboration is expected to collect the full exposure of 7.8×1021 protons on target, thanks to planned upgrades to the J-PARC and the neutrino beamline. An upgrade of the T2K near detector...
Victor Berezin, Vyacheslav Dokuchaev and Yuri Eroshenko
Institute for Nuclear Research of the Russian Academy of Sciences
Moscow, Russia
The role of the exact solutions in gravitational theories is impossible to overestimate. But the intrinsically
nonlinear character of gravitational eauations makes solving them a very...
The Tile Calorimeter (TileCal) of the ATLAS experiment at the LHC is the central hadronic calorimeter designed for the reconstruction of hadrons, jets, tau-particles and missing transverse energy. This sampling calorimeter uses steel plates as absorber and scintillating tiles as active medium. The light produced by the passage of charged particles is transmitted by wavelength shifting fibres...
Two-point one-loop amplitudes induced by charged fermions and modified by a constant homogeneous electromagnetic fields are presented. For the background field, two configurations – pure magnetic field and crossed electromagnetic fields – are considered. The set of two-point amplitudes of scalar, pseudoscalar, vector and axial-vector fermionic currents, already known in literature, is...
Comparison of data obtained by means of two facilities during thunderstorm periods of spring and summer of 2018 has been performed. Muon snapshots (muonographs) and meteorological maps obtained every ten minutes are compared with each other. Distributions of basic parameters describing variations of the muon flux during and before thunderstorms are obtained. Fourier and wavelet analyses of...
The study of vacuum polarization effects in strong gravitational fields is a pertinent issue since such effects may play a role in the cosmological scenario and the construction of a self-consistent model of black hole evaporation. These effects can be taken into account by solving the semiclassical backreaction equations
$ G^{\mu}{\nu}=8 \pi \langle T^{\mu}{\nu} \rangle, \qquad...
The procedure of the energy calibration of the highly granulated electromagnetic calorimeter PHOS of the ALICE experiment is presented. PHOS consists of 12544 PbWO4 crystals with Avalanche PhotoDiodes (APD) as photodetectors. It is accompanied by an LED monitoring system and cooling plant which maintains a stable temperature of the crystals at -25$^\circ$ C.
After this latest and new...
For studying muon bundles arriving at various zenith angles, the method of the local muon density spectra (LMDS) is used at the experimental complex NEVOD-DECOR (MEPhI, Moscow). Estimation of the primary particle energy by means of this method has a rather low accuracy – σ(lgE0) ~ 0.4 – due to contribution of extensive air showers (EAS) registered at different distances from the axis to the...
Now, after decades of purely theoretical research, a new era begins in the study of black holes. Thanks to such projects as the Event Horizon Telescope, LIGO and VIRGO, eLISA and others, it will be possible to obtain observational data and to test various theoretical models. Therefore, it is important to close some gaps
in the theories of black holes that have not been resolved in due time....
Coronal mass ejections (CME) have an impact on the flux of cosmic rays that penetrate the disturbed areas in the heliosphere and the near-terrestrial space. Unlike most ground-based cosmic ray detectors, the URAGAN muon hodoscope (MEPhI) allows to investigate both the integrated counting rate of registered particles and the spatial and angular characteristics of the muon flux at the ground...
Abstract.
Different types of gamma and electron detectors based on registration
of the electromagnetic (EM) cascades are widely used in the modern HEP
experiments. Thus the properties of EM showers are of particular
interest. In this report the new results on the fluctuations of charge particles fluxes in the EM cascades initiated by 10 to 1000
GeV electrons in lead are presented. GEANT4 was...
An investigation of the energy spectra of hydrogen muonic molecules is important
for muonic catalysis of nuclear fusion reactions. A calculation of fine
and hyperfine structure of muonic molecular ions as well as of higher order QED corrections allows us to predict the rates of reactions of their formation and other parameters of the $\mu$CF cycle.
In this work, the energy spectrum of the...
Tunka-Rex is a sparse antenna array, detecting radio emission from cosmic-ray air showers. It works in the frequency band of 30 to 80 MHz and consists of 63 station, equipped with SALLA antennas. Tunka-Rex operates jointly with other detectors of the TAIGA (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy) facility, the scintillator array Tunka-Grande and the air-Cherenkov...
Five fundamental problems - neutrino oscillations, baryogenesis, dark matter, inflation, strong CP problem - are solved at one stroke in a model, dubbed as "SM-A-S-H" (Standard Model-Axion-Seesaw-Higgs portal inflation) by Andreas Ringwald et. al. The Standard Model (SM) particle content is extended by three right-handed SM-singlet neutrinos $N_i$, a vector-like color triplet quark $Q$, a...
We consider a multidimensional Kaluza–-Klein-like model with nonlinear curvature terms and two spherical extra spaces of dimensions $m$ and $n$. The properties of an effective action for the scale factors of extra dimensions are studied. Dimensional reduction leads to an effective 4D multiscalar-tensor theory. Based on qualitative estimates of the Casimir energy contribution at a physically...
In the MPDRoot, projective geometry of the Electromagnetic Calorimeter had been developed, also specific classes had been prepared. Using this package, characteristics of the detector had been studied by Monte Carlo methods. We obtained information about energy and spatial resolution as well as registration effectivity for the different clusterisation procedures.
In the August few detector...
The excess of muons in observed extensive air showers with respect to Monte-Carlo simulations shows up itself in the data of various experiments and under different conditions. We present a comparative quantitative analysis of the muon content of showers observed at various energies, zenith angles, core distances etc. by several experiments.
The main goal of the NICA/MPD facility is a study of the properties of hot and dense baryonic matter. One of posible ways is to study of strangeness production in nuclear collisions.The enhance production of strange particles in heavy-ion collision is consider to be signal for quarck-gluon plasma formation.In this talk MPD detector abilities to measure different hypernuclei species in Au+Au...
There are two main processes during inflation - quick space expansion and grows of the field energy due to fluctuations. In simplest and most widespread realization of the inflationary scenario, only one dimensional parameter plays essential role - the Hubble parameter $H$.
If a compact space is involved into consideration, another dimensional parameter - an extra space size $l$ -...
DANSS is a highly segmented detector, which contains 2500 one meter long plastic scintillator strips. The DANSS detector is placed under industrial reactor of the Kalinin Nuclear Power Plant. The distance to the core is varied on-line from 10.7~m to 12.7~m, and the primal task of experiment is a search for short-distance neutrino oscillations. This work contains results of the cosmic muons...
We consider a novel quantum field-theoretical approach to the description of processes passing at finite space-time intervals based on the Feynman diagram technique in the coordinate representation. The most know processes of this type are neutrino and neutral kaon oscillations, which are described nowadays only in an eclectic quantum-mechanical approach. The experimental setting of these...
A new measurement of the neutron lifetime, carried out with the aid of a large gravitational spectrometer made in Petersburg Institute of Nuclear Physics (PNPI) is presented. In our experiment the measurement of neutron lifetime is carried out using the method of storing ultracold neutrons in a material trap with gravity barrier. Further improvement of the obtained result can be achieved at...
NA61/SHINE is a fixed-target experiment at the CERN Super-Proton-Synchrotron (SPS) measuring the hadron production in hadron-nucleus and nucleus-nucleus collisions with a large acceptance detector system. The measurements performed for a wide range of reactions provide valuable data for studying properties of hadronic matter under extreme conditions. They also provide precise results on hadron...
Overview of the construction and characterisation of the first prototype of large Micromegas chamber “LM2 Module-0” for the upgrade of the ATLAS Muon System is presented.
Performance studies of the detectors with cosmic rays and X-ray source are shown and discussed. Preliminary results of operating the detector under high rate irradiation at the CERN GIF++ irradiation facility and the future...
LUX-ZEPLIN (LZ) is a second-generation dark matter experiment to be installed 1480 m underground at the Sanford Underground Research Facility (SURF) in South Dakota, USA. The LZ detector is a dual-phase (liquid/gas) time projection chamber with active volume containing 7 tonnes of highly-purified xenon. The experiment will be looking for evidence of galactic dark matter in the form of Weakly...
Measurements of quarkonia produced in ultrarelativistic Pb+Pb collisions provide a means to probe the properties and evolution of the hot and dense medium created in those collisions. Promptly produced quarkonia are directly affected by the interaction with the hot nuclear matter, while non-prompt production allows for the study of $b$-quark energy loss. The studies of quarkonia production are...
Theories with broken Lorentz invariance have attracted much attention recently. For example, a promising approach to quantization of gravity based on abandoning Lorentz invariance has been proposed by Horava. At low energies Horava gravity reduces to a special case of the so-called Einstein-aether theory - a widely studied phenomenological model, where Lorentz violation is described by a...
We plan to develop an advanced Transition Radiation Detector (TRD) for hadron identification in the TeV momentum range, based on the simultaneous measurement of the energies and of the emission angles of the Transition Radiation (TR) X-rays with respect to the radiating particles. To study the feasibility of this project, we have carried out a beam test campaign at the CERN SPS facility with...
The results of the search of hidden-photon dark matter by means of a multi-cathode counter are presented. The technique is based on counting of single electrons emitted from outer cathode as a result of the conversion of hidden-photons. The apparatus and the calibration of the counter by ultraviolet lamp are described and the data processing is outlined in details. It is shown that this...
Measurement of electroweak boson production in different collision systems are of great interest to understanding the partonic structure of heavy nuclei, and serve as a constraint on the initial state in larger collision systems. Their production yields in Pb+Pb with respect to pp collisions provide direct tests of both binary collision scaling and possible modification of parton distribution...
The DArk Matter Particle Explorer (DAMPE) is a high-performance space particle detector launched in orbit on 17 December 2015 by a collaboration of Chinese, Italian and Swiss scientific institutions, coordinated by the Chinese Academy of Sciences. It consists of a high-resolution segmented BGO electromagnetic calorimeter with a depth of 31 radiation lengths, a silicon-tungsten...
The Compressed Baryonic Matter (CBM) experiment at the future Facility for
Antiproton and Ion Research (FAIR) aims to study the properties of nuclear
matter at high net-baryon densities and moderate temperatures.
The Silicon Tracking System (STS) is the key detector to reconstruct with
a high efficiency up to 1000 charged particle trajectories created in heavy-ion
collisions at interaction...
Extensive measurements of azimuthal anisotropy in relativistic A+A collisions, have provided invaluable insights on the expansion dynamics and the transport properties of the strongly interacting matter produced in such collisions. The recent results of flow measurements from the top LHC energy (5.2 TeV) to the top SIS energy (2.4 GeV) will discussed with emphasis on techniques,...
Generalized Melvin solutions for rank-$3$ Lie algebras $A_3$, $B_3$ and $C_3$
are considered. Any solution contains metric, three Abelian 2-forms and
three scalar fields. It is governed by three moduli functions $H_1(z),H_2(z),H_3(z)$
($z = \rho^2$ and $\rho$ is a radial variable), obeying
three differential equations with certain boundary conditions
imposed. These functions are...
The CRESST-III (the third stage of the Cryogenic Rare Event Search with Superconducting Thermometers) is a direct dark matter (DM) search experiment, located at the Laboratori Nazionali del Gran Sasso in Italy, where an overburden of 1400m of rock (3800m water equivalent) provides an efficient reduction of the cosmic radiation background.
In the first phase of the CRESST-III experiment,...
CMS experiment is one of the two general purpose experiments at the LHC pp collider. For LHC Phase-2, the instantaneous luminosity delivered to the experiment will reach $5\times10^{34}$ cm$^{-2}$s$^{-1}$, resulting in high particle fluxes that requires the detectors to be upgraded. The forward regions, corresponding to the endcaps of the detectors, are the most affected parts. In the CMS...
In this talk an overview of the heavy-ion program and the status of the Compressed Baryonic Matter (CBM) experiment at the future Facility for Antiproton and Ion Research (FAIR), which is being under construction in Germany, will be given.
We study the loop effects on the geometry and boundary conditions of time-dependent black hole spacetimes and analyze the energy measured
by an infalling observer near their horizons. As a result of our studies (A.J. Nurmagambetov & I.Y. Park JHEP05(2018)167) we obtain a trans-
Planckian energy in the time-dependent case, the importance of which for the black hole (in)formation is discussed.
Over its ten years of mission the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope has collected the largest ever sample of high-energy cosmic-ray electron and positron events. Possible features in their energy spectrum could be a signature of the presence of nearby astrophysical sources or of more exotic sources, such as annihilation or decay of dark matter (DM) particles in...
BM@N (Baryonic Matter at the Nuclotron) is the fixed target experiment aimed to study nuclear matter in the relativistic heavy ion collisions at the Nuclotron accelerator in JINR. Detectors based on Gas Electron multipliers (GEM) have been identified as appropriate for the BM@N central tracking system, which is located inside the BM@N analyzing magnet. Cathode Strip Chamber (CSC) is installed...
The REcoil Directionality project (ReD) aims at investigating a novel observable
for directional dark matter detection in next generation liquid argon detectors. A small liquid argon dual-phase TPC of innovative design will be exposed to a neutron beam produced at the Laboratori Nazionali del Sud (LNS, Italy) Tandem accelerator to investigate "columnar recombination” effects.
We study $D$-dimensional Einstein-Gauss-Bonnet gravitational model including the Gauss-Bonnet term and the cosmological term $\Lambda$. We find a class of solutions with exponential time dependence of two scale factors, governed by two Hubble-like parameters $H >0$ and $h$, corresponding to factor spaces of dimensions $m >2$ and $l > 2$, respectively. These solutions contain
a fine-tuned...
Performance of the ALICE charge-particle veto detector in pp collisions at 13 TeV
Sergey Evdokimov for the ALICE collaboration
The charged-particle veto (CPV) detector of the ALICE experiment is a multi-wire proportional chamber with pad readout. It is designed to improve photon identification in the photon spectrometer PHOS. One module of the CPV detector was put in operation in LHC Run2...
Brief overview on microstructure gaseous detectors (MSGD) used in high-energy physics and description of technological steps for producing gas electron multiplier (GEM) made of polycrystalline CVD diamond are presented. GEM is widely used in modern gas detectors of ionizing radiation in experiments on high-energy physics at accelerators and in other fields of science. The test results of the...
Disk accretion is a very common phenomenon in the Universe: planets are born in accretion disks near young stars, bright X-ray outbursts of accretion disks occur in close star binary systems, supermassive black holes accrete matter from the surrounding disks. Observation behavior of accretion disks in different sources are described in the terms of standard accretion disk model (Shakura &...
Precision measurements of beta-spectra have always been and are still playing an
important role in several fundamental physical problems, predominantly in
neutrino physics.
Magnetic and electrostatic spectrometers possess the superior energy resolution,
but at the same time such devices appear to be very complex and large-scale
setups.
Since the electron free path at $3$~MeV (which...
for the CBM Collaboration — Physikalisches Institut, Eberhard Karls Universität Tübingen
The CBM experiment at FAIR is being designed for the study of the QCD phase diagram in the region of the high baryon chemical potential at relatively moderate temperatures. The Silicon Tracking System (STS) is the central detector for momentum reconstruction of the produced charged particles in the CBM...
Recent results from the Belle experiment.
B.Shwartz for Belle collaboration,
Budker Institute of Nuclear Physics and Novosibirsk State University,
Novosibisrsk, Russia
Experiments at the KEKB ee energy-asymmetric collider with world highest luminosity, 2.11034cm-2s-1, continued with the Belle detector from 1999 to 2010. The total integrated luminosity collected in these experiments in the...
Neutinoless double beta decay is a lepton number violating decay which should be observable for some isotopes like Ge76 if neutrinos are Majorana particles. One historically important and still leading technology is using germanium detectors made from material with enriched Ge76 fraction. The talk discusses the recent results from GERDA and the preparations for the future LEGEND experiment.
The modern detection of giant flares on the star dwarfs of the class G with the energy significantly exceeding the energy of the solar flares indicates the possibility of proton acceleration beyond the boundary of the solar system to energies significantly greater than the energy of solar cosmic rays. The superflare generation with the energy much larger than energy of big solar flares on a...
The one-step decay ($A$ → $a_1$ + $A_1$) of the ground state of the resting parent nucleus A with the formation of real states of nucleus $A_1$ and particle $a_1$ is impossible, if the heat $Q_1$ of this decay, defined as $Q_1$ = $E_A$ − $E_{A_1}$ −$E_{a_1}$, where $E_A$, $E_{A_1}$ and $E_{a_1}$ are the internal energies of nuclei $A$, $A_1$ and particle $a_1$ , and connected at the...
The talk will cover most recent results and present status of the spectroscopy of excited heavy (charmed and bottom) baryons: their masses, natural widths, decay modes and presumably assigned quantum numbers.
The origin and acceleration mechanism of ultrahigh-energy cosmic rays (UHECRs) are of the upmost importance in particle astrophysics and astronomy. The Telescope Array Experiment (TA) is the largest cosmic ray detector in the Norther hemisphere, located near the town of Delta in central Utah, USA. TA consists of a surface detector array overlooked by fluorescence detectors and covers a ground...
Possible temporal variations of nucleus decay parameters studied extensively in the last years, their observation can be the signal of unknown physical effects. Earlier, several experiments reported the annual and daily decay rate oscillations in alpha and beta-decays of some nuclides of the order .05 % [1,2]. BGU - PhIAN experiment studies the decay rate variations in inverse beta-decay...
A review of recent charmonium experimental results at Belle is presented, including observation of an alternative $\chi_{c0}(2P)$ candidate in $e^+ e^- \rightarrow J/\psi D \bar{D}$, measurements of the absolute branching fractions of $B^+ \rightarrow X_{c\bar{c}} K^+$, measurement of $\eta_c(1S)$ and $\eta_c(2S)$ two-photon production, search for $\Upsilon(1S,2S) \to Z_c^+ \bar{Z}_c^-$.
We discuss ultra-high energy cosmic rays from supermassive black holes and their contribution to the particle flux on the Earth along with diffuse gamma-ray emission and cosmogenic neutrino flux. Several processes of particle acceleration in supermassive black holes are suggested in literature, based on which various particle injection spectra are considered in this paper. Cosmic ray spectra...
There are several different predictions for the behaviour of the gluon distribution in nuclei at small Bjorken x and experimental data are needed to choose among them. This is achieved by measuring the cross section of processes specially sensitive to this parton distribution.
The high flux of photons from lead ions at the LHC allows us to study photon-induced reactions in ultra-peripheral...
Until recently, parameters of vector charmoinia lying above the open-charm threshold were determined from the inclusive cross section of the electron-positron annihilation to hadronic final state. However, the parameters of the resonances obtained this way are model-dependent and they suffer from large uncertainties. On the other hand, measurements of exclusive cross sections of the e+e-...
Nuclei and isotopes of secondary origin are important tools to understand and model the propagation of cosmic rays (CR) through the Galaxy.
We report on the observation of new properties of secondary cosmic rays Li, Be, and B measured in the rigidity (momentum per unit charge) range 1.9
GV to 3.3 TV with a total of 5.4 million nuclei collected by AMS during the first five years of operation...
Description of the TAU-4 installation intended for long-term monitoring of the half-life value T1/2 of the 212Ро is presented. Natural thorium used as a source of the mother’s chain. The methods of measurement and processing of collected data are reported. Short testing measurements were made in the ground building (680 hours) and underground laboratory (564 hours). Averaged value...
Measurements of direct photon production in heavy-ion collisions provide a unique tool to test proton structure and properties of the hot QCD medium. Unlike hadrons, direct photons are produced in all stages of a nucleus-nucleus collision and escape freely from the hot zone. Prompt direct photons can be emitted in pp, p-Pb and Pb-Pb collisions and provide means to test the initial stage of AA...
The neutron spectra induced by the flux of primary cosmic radiation, taking into account its absorption in the atmosphere and the generation of neutrons in the energy range 0.05-1 GeV has been estimated. An estimate of the neutron flux with energy above 1 GeV is approximately 0.3 $particle/m^2/s/sr$. An evaluation of the neutron flux has been conducted to realize a ground-based experiment to...
Line shapes of the Zb(10610) and Zb(10650) bottomonium-like exotic states produced in the decays of vector bottomonium Upsilon(10860) are analysed. A combined analysis of the existing experimental data in the elastic and inelastic decay channels of Upsilon(10860) is performed within a nonperturbative coupled-channel approach which complies with the requirements of unitarity and analyticity of...
The PAMELA experiment has measured the electron and positron fluxes at Earth orbit from June 2006 till January 2016. The spectra have been evaluated in wide energy range from several tens MeVs till several TeVs. Measurements were carried out during the A<0 solar minimum of solar cycle 23 till the beginning of A>0 epoch. These measurements provide important information to study cosmic ray...
The structure of the levels of the heavy helium isotope 7He have been studied in reactions of stopped pion absorption: 12С(pi–, p4He)X, 12С(pi–, d3He)X и 14С(pi–, t4He)X. Experiment was performed at low energy pion channel of the LANL using two-arm semiconductor spectrometer. Search for nuclear states was correlative measurements of missing mass spectra up to excitation energy of ~ 30 MeV.
Assuming a molecular nature for the $Z_b(10610)$ and $Z_b(10650)$ exotic states, the properties of these states and their pole positions are extracted from the effective-field theory based analysis of the experimental line shapes in the decay channels $\Upsilon(10860) \to \pi \alpha$ (with $\alpha$ being $B\bar B^*, B^*\bar B^*$ and $h_b (mP)\pi$ ($m$=1,2)). The consequences for the...
The NA61/SHINE experiment at the CERN SPS recently extended its program for the energy scan with Pb ions in the energy range of 13-150A GeV/c. In the year 2016 a sample of Pb-Pb collisions at 13 and 30A GeV/c was collected by the NA61/SHINE experiment. The NA61/SHINE measurements with Pb ions and the experimental techniques using spectators at the lowest energy available at the SPS are also...
In this talk we present an analysis of the Unfold technique for reconstruction of the truth distribution of the measured experimental value. To test we select a particle's rigidity measured by magnetic track system of PAMELA spectrometer, obtained by simulations of the device with Geant4 Monte-Carlo simulation. A modern popular unfolding techniques was analyzed: D'Agostini, SVD and L-curve. It...
Recent results on Higgs boson production and decays in the ATLAS and CMS experiments at the LHC are reviewed. They are mostly based on the analyses of 13 TeV LHC proton-proton collision data accumulated during 2015--2016 or 2015--2017 year exposures. Production cross sections in five main decay channels are measured. These channels are combined to extract the Higgs boson signal strength, mass...
A cluster is broadly understood to be an object which keeps its identity in a larger scale system. Manifestations of clustering can be revealed in very different size systems from exotic nuclei to galaxies. In our work we are searching for cluster effects in low energy fission of heavy nuclei.
In the series of experiments carried out with the spectrometers based both on the gas filled (FOBOS...
$^{7}$He, a particle unstable nucleus is lying in the line of neutron – rich Helium isotopes between $^6$He with a neutron halo and $^{8}$He having a neutron skin [1]. Normally it is taken for granted that the notion “halo” could not be applied to unstable nuclei. However, if the time of life T of a particular nucleus is much larger than the characteristic time τ of flight of the escaping...
In this talk we review recent results on heavy flavor physics at ATLAS and CMS. It includes results from a study of production and properties of b-hadrons with open or hidden beauty as well as rare decays of B-mesons in which the phenomena of New Physics were searched for.
The discussed results are based on the statistics obtained
during Run I (8 TeV) and Run II (13 TeV).
The results of studies of the interaction of ion beams and X-ray quanta with deuterated crystal structures at the HELIS facility (LPI) are presented. Results on research of DD-reactions in deuterated crystal structures at deuteron energies 10-25 keV are shown significant enhancement effect. It is shown that the effect of the beams of ions Ne+ and H+ at energies in the range of 10 - 25 keV and...
Relativistic heavy-ion collisions provide a unique opportunity to study
nuclear matter under extreme density and temperature.
NICA (Nuclotron-based Ion Collider fAcility) is a new flagship project
aimed at the construction at JINR (Dubna) a modern machine providing
beams of heavy ions with the highest intensity ever
achieved in the energy range from 4 to 11 GeV per nucleon.
The main...
Three nucleon system(triton) was considered.
Relativistic properties of this system were investigated.
For this relativistic generalization of Faddeev approach was used.
As two particle T-matrix which contained in relativistic Faddeev equation we used solution of Bethe-Salpeter equation.
So eventually we had Bethe-Salpeter-Faddeev(BSF) equation for describe three nucleon system.
As potential...
The Belle II detector together with the SuperKEKB e+e− asymmetric collider are the second generation experiment at a B-Factory. The aim is to reach a luminosity of 8 × 1035 cm$^{−2}$s$^{−1}$, that is a Υ(4S) production rate close to 800 Hz, by exploiting the nano beam collision scheme with large Piwinsky angle.
A major upgrade of all the components of the former Belle detector had been...
The possibilities of the Multi-Purpose Detector (MPD) to register data from small systems like proton - proton collisions are studied with Monte Carlo simulations of proton - proton inelastic interactions at the energy range of NICA. Particle generators based on different models are compared. The production of protons, pions and kaons from pp collisions is studied through their mean...
The observation of the Bs2(5840)0 -> B0 K0S decay and the evidence for the Bs1(5830)0 -> B0 K0S decay are presented. The analysis uses the data collected by the CMS experiment at the LHC in proton-proton collisions at sqrt(s) = 8 TeV. In addition, properties of the P-wave B0 s mesons are determined, as well as the mass differences MB0 − MB+ and MB0 - MB*+, where the latter is measured for...
The last year was marked by the first observation of doubly heavy baryon $\Xi_{cc}^{++}$ in the decay mode $\Lambda_c^+ K^- \pi^+ \pi^+$, which was confirmed by the observation of decay $\Xi_{cc}^{++} \to \Xi_c^+ \pi^+$ this year. This circumstance greatly revived the research activities in this direction. In the study we discuss from the theoretical point of view the perspectives of...
The newly observed $d^*(2380)$ resonance ($I(J^P)=0(3^+)$) is studied based on a chiral constituent quark model. Its overall properties, including the mass, the partial decay widths in various decay modes, and the total width, are well reproduced in our calculation and with a compact scenario. Our results show that a compact hexaquark dominated structure might be a reasonable interpretation...
In view of the recent discovery of $\Xi_{cc}$ by the LHCb collaboration the study of doubly heavy baryons is becoming relevant. In this work we discuss the prospects of the observation of such states with excited $cc$-diquark (S and P excitations) by the LHCb experiment. P-wave excitations of a diquark in $\Xi_{cc}$ are expected to be quite narrow since their decay into the ground state is...
The Dibarion resonance d(2380) was measured in the two pion production
reactons $pN->d\pi\pi$ and by use of a polarized
deuteron beam in the quasifree scattering mode on hydrogen target.
Total and differential cross sections have been measured for the various isotopic
final states. Covered energy region includes the regions of N(1440) and
$\Delta(1230)\Delta(1230)$ resonance excitations....
Non-global logs are very common in observables that are used in precision measurements at particle collider experiments. Perturbative convergence is spoled by the presence of these calculations necessitating a difficult all-orders resummation. The integro-differential Banfi-Marchesini-Smye equation, valid in the Large-Nc aproximation and usually solved numerically, provides us with means to...
