Measurements of difference between vector and axial form factors $F_V-F_A$ in the decay $K^+\to\mu^+\nu\gamma$. Data acquired in 2012 and 2018 is used in the analysis. measurement using latter dataset is presented for the first time.
The high statistics search for structure dependent (SD) components of radiation in K+ -> e+ nu pi0 gamma decay is performed by the OKA collaboration. The 4-dimensional distribution of about 3000 events of the decay in the phase space area of E(gamma)>30 MeV, Theta(e-gamma)<20 degrees analysed. The total SD contribution to branching ratio (including interference) is measured to (3 +-...
Recent results on searches for rare and forbidden decays at the CMS experiment at the LHC are presented. The analyses use data collected in proton-proton collisions at center-of-mass energies of 13 and 13.6 TeV.
The connection between Standard Model (SM) particles and light dark matter (LDM) can be introduced via spin-0, spin-1, and spin-2 mediators. Moreover, in a mediator mass range from sub-MeV to sub-GeV, fixed-target facilities can potentially probe such particles of the hidden sector via missing energy signatures that are described by the bremsstrahlung-like process involving leptons. We also...
The latest results on the search for light dark matter in the NA64 experiment are presented. Searches in electron, muon, and hadron beams are considered. The plans for modernization of the installation for operation in high-intensity beams are outlined.
In the talk I'll discuss the physics program for searching for new physics in the experiment of the recently proposed TiMoFey project, based at the Troitsk Meson Factory of the Institute for Nuclear Research of the Russian Academy of Sciences. The project involves the use of a high-intensity proton beam with an energy of 423 (1300) MeV during its first (second) stage. The project's...
Recently [Phys. Rev. D 112 (2025) 035003; arXiv:2506.18595 [hep-ph]], we proposed an experimental project called the Cosmological Axion Sarov Haloscope (CASH), aimed at searching for dark-matter axions via their conversion into microwave photons in a magnetic field. The key feature of the experiment is the use of Josephson-junction single-photon detectors (JJ SPDs) operating at ultralow...
The development of a Highly Granular Time-of-Flight Neutron Detector (HGND) for measuring neutron yields and flow in the 0.3-4 GeV kinetic energy range in nuclear collisions at the BM@N experiment is almost finished. To validate the concept of the full-scale HGND, a compact HGND prototype was tested in 3.8A GeV 124Xe collisions with a CsI target in the BM@N experiment in 2022. The prototype...
The difference between the numbers of neutrons and protons in atomic nuclei defines the isospin asymmetry of nuclei. The squared relative difference between the local densities of neutrons and protons contributes to the density-dependent symmetry energy term in the equation of state of nuclear matter. In particular, this contribution makes the nuclei with a large neutron excess...
The reaction np → Δ-Δ ++ was studied at incident neutron momenta P0 = 3.83 and 5.20 GeV/c. The reaction cross‑sections were calculated. It has been shown that to describe the spin density matrix [ρij], it is necessary to take into account the ρ‑meson exchange diagram. The obtained results are compared with data from other experiments.
The experiment on photodisintegration of tensor polarized deuteron is in progress. It is carried out at VEPP-3 storage ring using the internal polarized gas target technique. The component T20 of the tensor analyzing power is obtained by measuring the target polarization asymmetry in the photon energy range 400–640 MeV. The energy of photons is defined by the system that tags nearly real...
The resonance peak observed by WASA@COSY in the total cross section of the reaction of two-pion production in the isoscalar channel of the reaction pn → dπ0π0 [1] at invariant mass 2380 MeV with the width of 70 MeV, is considered as one of the most realistic candidate to the dibaryon resonance. The isospin of this resonance is I=0 and spin-parity JP=3+. A similar resonance structure was...
The angular distributions of Drell-Yan lepton pairs allow to determine precisely the dynamics of vector boson production in quantum chromodynamics. The dependence of the angular coefficients on the transverse momentum of the $J/\psi$ meson was obtained at the energy of the second stage of the SPD experiment using the Pythia generator. The $J/\psi$ mesons produced in $pp$ collisions at...
Results of measurements of Higgs boson production cross section via the vector-boson-fusion mechanism (VBF) at the LHC are reviewed. Perspectives of such measurements at the high-luminosity LHC as well as at possible future electron-positron, hadron and muon colliders are discussed.
This report presents the latest results and analysis strategy for the search for Higgs boson decays into dark matter (DM) particles using data collected during Runs 1 and 2 of the Large Hadron Collider (LHC). The search is interpreted within Higgs-portal models, in which the Higgs boson provides a connection between the Standard Model and the dark sector. Upper limits on the Higgs boson...
Data provided by the LHC enable searches for a variety of new particles, but no deviations from the SM have been found. Therefore, these studies are supplemented by indirect searches for new physics in the same data, assuming that new particles are inaccessible. Anomalous quartic gauge couplings can arise in diverse physics models; limits on the coupling parameters are related to constraints...
Using an up-to-date compilation of $\sigma_{\mathrm{tot}}(e^+e^- \to hadrons)$ data we estimated the LO hadronic contribution $a_\mu^{LO\, HVP}$ to the muon anomalous magnetic moment $a_\mu$. Incompatibilities between $\sigma_{\mathrm{tot}}(e^+e^- \to hadrons)$ measurements by independent experiments are mitigated by extra systematic uncertainties estimated using as a guideline a requirement...
Some extensions of the Standard Model (SM) predict the existence of fermions with an electric charge much smaller than that of the elementary charge. Such particles, known as millicharged particles (MCP), may be produced in nuclear reactors from the interactions between gamma-rays and the electrons of reactor materials. In this work, the MCP flux and energy deposition distributions at Kalinin...
The measurement of the Higgs boson parameters constitutes a significant part of the CEPC program. This work is devoted to studying the process e-e+->ZH at sqrt(s) = 240 GeV with all-hadronic, four-jet final states. The CEPC detector fast simulation and event reconstruction using the Delphes package have been performed for the signal and different background processes. A novel approach to...
The results on the measurement of CP violation in B(s) and D decays from CMS are reviewed. Among them we present precise measurement of phi_s and sin(2beta) parameters. The results are based on pp-collision data at 13 and 13.6 TeV.
We present the results of the analysis of multiparticle correlations with the factorial moment method. This method consists in plotting the dependence of normalized factorial moments of multiplicity distribution in the intervals of a dynamical variable on the size of these intervals and enables one to exclude statistical effects related to the finite particle multiplicity in events.
...
The pair of excited states $B_c^{(*)}(2S)^+$ of the $B_c$ meson is studied, with the aim of measuring the mass of the $B_c(2S)^+$ state and the parameter $m^*=m\big(B_c^*(2S)^+\big)-m\big(B_c^{*+}\big)+m\big(B_c^+\big)$.
$B_c$-meson is a rare and understudied particle due to its large mass of over 6 GeV, and research of its excited states lies at the forefont of high energy physics.
In this...
The process $e^{+}e^{-}\to K^{0}_{S}K^{\pm}\pi^{\mp}$ is important for the various physics problems. The cross section is contributing to hadronic part to the vacuum polarization in measurement of (g-2)/2 of muon. Dynamics of the process is interesting but poorely studied. And at last analysing this final state one can determine the parameters of the of orbital and radial excitations of light...
High-precision measurements of charmonium states in proton-proton collisions at the ALICE experiment at LHC necessitate robust electron identification and background suppression. A comprehensive analysis of electron identification performance within the ALICE experiment is presented, utilizing Run 3 proton-proton collision data at $\sqrt{s}= 13.6$ TeV. Electron identification is based on...
We report results of developments carried out in the framework of project of Tomsk State Research University supported by the Government of Russian Federation.
The Geant4 toolkit is widely used in HEP and in other application domains including space science and radiation medicine. For the Geant4 electro-magnetic physics two new processes we provided: muon pair production by relativistic muons;...
Test experiments with several prototypes of a transition radiation detector
were carried out in accelerator beams. The detector is based on a GaAs crystal
coupled to a pixel chip with a pixel size of 55 μm. Such a detector makes it
possible to efficiently distinguish the signals produced by the ionizing
particle from those produced by transition radiation photons, thereby
significantly...
Deterministic solution of the radiative transfer equation (RTE) on a fixed grid is a possible alternative to Monte Carlo photon tracking for light propagation in water and ice, for example in neutrino telescopes like BaikalGVD. However, the relevant sources, Cherenkov light from charged-particle tracks, are sharply localized in both space and direction. We present an implementation of a...
SuperFGD [1] is a highly segmented scintillator neutrino target with a three-dimensional structure comprising nearly two million scintillator cubes, each 1 cm on a side. It is currently operating as part of the upgraded ND280 near detector [2] and is collecting data from the T2K neutrino beam [3]. Scintillation photons produced when a charged particle passes through a scintillator cube are...
The electromagnetic calorimeter (ECAL) of the Multi-Purpose Detector (MPD) at NICA uses silicon photomultipliers (SiPMs) to read out the 38,400 cells. The report presents the LED calibration procedure of the SiPMs, the distribution of the required operating voltages, and the assessment of calibration quality across the tested board population. The application of the generated configuration...
The cylindrical electromagnetic calorimeter (ECal) is one of the key subsystem of the MPD detector having the main goal to search a quark-gluon plasma [1]. It consists of 50 half-sectors comprising 768 “shashlik”- type cells (towers). The towers are truncated pyramids of 64 different types and varying orientations. The calibration of individual half-sectors has been completed now, which is...
An experimental study of xenon-cesium iodide (Xe+CsI) collisions at a beam kinetic energy of 3.8A GeV was performed at the BM@N experiment. The BM@N setup is equipped with forward detectors, including the Forward Hadron Calorimeter (FHCal) and the Forward Quartz Hodoscope (FQH), which provide information on the geometry of nuclear collisions.
In this work, the performance of the forward...
