A partial-wave analysis of the decay $J/\psi \to K^+K^-\pi^0$ made using $(223.7\pm1.4)\times 10^{6}$ $J/\psi$ events collected with the BESIII detector in 2009 will be presented. We report the most precise measurements of $K^*(892)^\pm$ and $K^*_2(1430)^\pm$ mass and width. The analysis reveals contributions from $K^*_2(1980)^\pm$ and $K^*_4(2045)^\pm$ for the first time in $J/\psi$ decays....
DsTau (NA65) at the CERN-SPS is a recently approved experiment, which aims to study the tau neutrino production. The main source of tau neutrinos is the decay of Ds mesons, namely Ds → τντ and then τ → ντX. There is almost no data on the differential production cross section of Ds in proton-nucleus interactions, which leads to a large uncertainty of tau neutrino cross section measurements...
A variety of important studies is planned at the future CLIC e+e‑ collider with energy up to 3 TeV. One of the studies is the precision Higgs boson mass measurement planned at the first stage of the CLIC project. The traditional method of recoil mass reconstruction was shown to be ineffective for this type of studies in the CLIC experimental conditions. Instead the new method of the Higgs...
The main goal of the NA62 experiment at CERN is to measure the probability of the ultra-rare $K^+$ → $π^+vv$ decay. The collected statistics for 2016-2018 years allow us to analyze other rare decays, in particular, $K^+→e^+vµ^+µ^-$. Since the inner bremsstrahlung (IB) for $K^+→e^+vµ^+µ^-$ decay is suppressed (0.03%), this decay is well suited for measuring form factors ($F_V$, $F_A$, and R)....
In this paper, we study the angular features of the signal and background processes of the associated production of the Higgs boson with W-boson. Signal and background processes are generated using the CompHEP, POWHEG and PYTHIA generators. Monte Carlo data is processed in ROOT software. We also compared the shape of the distribution of kinematic variables obtained from different generators....
The presented search for new high-mass resonances decaying into lepton pair. The search uses pp collision data at a centre-of-mass energy of 13 TeV collected by the CMS experiment at the LHC in 2016, corresponding to an integrated luminosity of 36 fb-1. Upper limits on the product of a new resonances production cross section and branching fraction to dileptons are calculated in a model...
The results of measurements of angular coefficients for Z bosons produced in pp collisions and decaying to mu+mu- are presented. The data collected by the CMS detector during the LHC Run-I and Run-II was used.
Analyzing power of the elastic proton-proton scattering was obtained at the Nuclotron Internal Target Station using a polarized deuteron beam and a polyethylene target. The asymmetry on hydrogen was obtained by the subtraction of the carbon background. The final selection of useful events was performed using time and amplitude information from scintillation counters. The obtained analyzing...
We analyze the possibility to discover the production of a Higgs boson in association with a single top quark at the LHC. The analysis considers single top quark production via t-channel using Higgs boson decays to a bottom quark-antiquark pair and semileptonic top quark decays. Such process is strongly suppressed in the Standard Model. An observation of this production mode would be an...
Terrestrial Gamma-ray Flashes (TGF) - short (~ 100 μs) and intense flashes of terrestrial gamma radiation, the source of which is thunderstorms. This remarkable natural phenomenon has been observed for over 20 years by satellites (for example, Fermi), as well as by ground-based observatories (for example, the Array telescope).
It is believed that the source of gamma radiation is avalanches of...
The multipurpose detector (MPD) has been designed at the JINR to study the properties of hot nuclear matter at the NICA collider. The electromagnetic calorimeter (ECal) is one of the subsystems responsible for the identification of γ-quanta and electron-positron pairs. In addition, it is responsible for their separation from hadrons (for example, π0-mesons) as well as for measuring their...
The Fast Forward Detector (FFD) is an important part of the Multi-Purpose Detector (MPD) facility for study of Au + Au collisions with beams at the NICA collider.
FFD consists of two modular arrays with 20 modules per sub-detector. Each module contains quartz radiators, an MCP-PMT, a high voltage divider and a front-end electronic board (FEE).
The FFD modules of each array are...
BaF2 scintillator crystals are considered as candidates for use in the electromagnetic calorimeter of the second phase of the Mu2e experiment. The key advantage of this scintillator is its high radiation stability and a fast emission component with a short decay time of 0.6-0.8 ns in the 190-250 nm range, which would significantly improve the speed and time resolution of the calorimeter....
At present, in Dubna, Russia a new acceleration complex NICA is approaching final stages of its construction. At collider, there will we two major detectors, one of them, Multi-Purpose Detector (MPD), is going to be used for studying properties of dense baryonic matter. One of the most important parts of MPD is Forward Hadron Calorimeter (FHCal). FHCal will consist of two arms: left and right,...
Baryonic Matter at Nuclotron (BM@N) is a fixed target experiment at the NICA accelerator complex (JINR) aiming at studies of nuclear matter in relativistic heavy ion collisions. Detectors based on Gas Electron Multipliers (GEM) are used for the central tracking system, which is located inside the BM@N analyzing magnet. The current status of the GEM tracking system is presented.
The paper presents measurements of the noise characteristic of SiPM in the temperature range from 27.7 °C to 39.1 °C, as well as study of the response of the detector prototypes Ketek and Hamamatsu with SiPM readout to the LED at different voltages. The prototype with SiPM readout from Ketek was tested on the JINR Nuclotron deuteron beam at the energy of 4 GeV/nucleon. Time resolution and...
One of the tasks of the precision hybrid magnetic spectrometer SCAN-3 at the Joint Institute for Nuclear Research (JINR) in Dubna is to register neutrons from the decay of the η-meson nucleus via the πn- and pn-channels. The only way to provide neutron spectrometry is to use the time-of-flight method. Taking into account the geometry of the SCAN-3, confines are imposed on the accuracy of...
The Multi-Purpose Detector (MPD) being currently developed in the High Energy Physics Laboratory, will allow observations of particles created in heavy ion collisions. One of the most important systems of the MPD which is going to be used in identification of these particles is gaseous Time-of-Flight detector, based on the mRPC (Multi Resistive Plate Chambers) technology. To the formation of...
We present the analysis of the identified charged particles (π±, K±, p, p-bar) formation at mid-rapidity (|η|< 0.5) in collisions of Au-Au ions with energies √SNN = 4, 7, 9, 11 GeV. Particle momentum spectra for charged hadrons (kaons, pions, protons) are measured using data from statistical Monte-Carlo generator of Ultrarelativistic Quantum Molecular Dynamics (UrQMD) for a Multi-Purpose...
MiniSPD is an installation for cosmic muon tests of all types of the detectors that to be used in the SPD setup. The detectors and readout electronics for the NA64 experiment also will be tested. It includes the scintillator-based trigger system, straw, silicon and GEM trackers, modules of the electromagnetic calorimeter, and the lead filter to remove the soft component of cosmic rays. It will...
The paper presents a method and means for automated monitoring of the stability of the gas gain coefficient in the registration system based on gas-discharge proportional counters.
Experiments using straw-detectors require constant monitoring of the gas gain, which depends on a complex of variables. However, it is not always possible to control each parameter, hence the need to track the...
The measurement of Short-Range Correlations (SRC) at Baryonic Matter at Nuclotron (BM@N) for the first time provides information on the nucleus properties after interaction. The coordinate and time detectors located upstream and downstream the analyzing magnet make it possible to determine the charge-to-mass ratio for each fragment.
The total charge in the event is measured by the...
The measurements of strange hyperons polarization in heavy ion collision allows to study important characteristics of QCD medium (vorticity, hydrodynamic helicity). One of the goals of BMN and MPD experiments at NICA is to research hyperons. In this analysis, we study $\Lambda$ polarization produced with LAQGSM event generator and simulated via Monte Carlo. The simulation was performed for ...
BM@N (Baryonic Matter at Nuclotron) is a fixed target experiment at the NICA - Nuclotron accelerator complex (JINR). It is aimed at studies of nuclear – nuclear (up to gold-gold) collisions at high densities. The Nuclotron provides heavy ion beams with energies from 2.3 to 3.5 GeV, which is suitable for studies of strange mesons and multi–strange hyperons produced in nucleus-nucleus collisions...
The beam energy scan program has been carried out by STAR experiment at the
Relativistic Heavy Ion Collider to search for the onset of deconfinement and a possible critical point where the transition from a Quark Gluon Plasma to a hadronic phase changes from a rapid cross over to a first-order phase transition. Azimuthal anisotropy of produced particles is one of the important observables...
The goal of the MPD experiment at NICA collider is to explore the QCD phase diagram of strongly interacting matter produced in nucleus-nucleus collisions at $\sqrt{s_{NN}}$=4-11 GeV in the region of high net baryon chemical potential and moderate temperatures. The anisotropic collective flow is one of the key observables sensitive both to the transport properties and equation of state of such...
The program of the polarimeter upgrade at Internal target station at the Nuclotron are presented. The simulation of the pd-elastic and pp-elastic scattering for 500 - 1000 MeV proton energy is performed. First results of the proton polarization measurements are presented.
Collisions of $^{197}$Au nuclei with the center-of-mass energy $\sqrt{s_{NN}}$ from 4 to 11 GeV will be studied in the MPD (MultiPurpose Detector) experiment at NICA collider, which is presently under construction. In the BM@N experiment at the same facility nuclear beams interact with fixed targers. The NICA facility is designed for the investigations of baryon-rich strongly-interacting...
Geant4 toolkit is a common instrument for the simulation of the experiments in high-energy physics. This work discusses the stand MiniSPD, its main goals and objectives. The model of the stand implemented using the Geant4 package is presented. The results of the run a simulation of cosmic ray particle beam depending on the selected parameters are discussed and analyzed.
At present, the heavy-ion accelerator complex NICA is being built at JINR (Dubna). One of the experimental facilities, MPD at NICA was designed to investigate the properties of the strongly interacting matter. The centrality of the ion collisions is the most significant parameter for the global event characterization. In general, a few methods can be used for centrality determination. The...
