The scientific setup that is intended to be used for studying the nucleonsโ spinal structure and other phenomena related to spin is SPD (Spin Physics Detector). It is planned to be placed in one of the two collision points of the NICA collider being built in the International Intergovernmental Scientific Research Organization "Joint Institute for Nuclear Research" (Dubna, Russia).
To...
The Spin Physics Detector (SPD) experiment at the Nuclotron-based Ion Collider fAcility
(NICA) is an upcoming project with an extensive physics program aimed at studying the spin
structure of the nucleons. The experiment will record data from the collisions of polarized
proton and deuteron beams. One of the important particles produced in such collisions is the
ฮ-hyperon. It is noteworthy...
The Spin Physics Detector is a collider experiment at NICA designed to study the spin structure of the proton and deuteron and other spin-related phenomena using polarized beams. One of the subsystems of the SPD is the Beam-Beam Counters (BBC). Two scintillator-based BBC detectors will be installed symmetrically upstream and downstream the interaction point and will serve as a tool for beam...
The SPD (Spin Physics Detector) is a planned spin physics experiment in the second interaction point of the NICA collider that is under construction at JINR. The main goal of the experiment is the test of basic of the QCD via the study of the polarized structure of the nucleon and spin-related phenomena in the collision of longitudinally and transversely polarized protons and deuterons at the...
The integration and application of the CAEN front-end readout system within the miniSPD facility is presented, with a focus on calorimeter modules. The miniSPD is designed for cosmic muon testing of the detectors planned for use in the SPD facility, including straw, silicon, and GEM trackers, along with electromagnetic calorimeters. The main objectives include verifying the functionality and...
The electromagnetic calorimeter ECal of the MPD/NICA multipurpose detector is a modular cylindrical system consisting of 50 half-sectors and containing 38400 towers of the "shashlik" type. The main task of ECal is to determine the energy parameters of photons and electrons. To do this, it is necessary to align the tower responses and energy calibration. As a preliminary alignment of the...
The MPD facility of the NICA complex is designed to study heavy ion collisions and should provide accurate determination of events, which is necessary for precise particle identification. Synchronization of all detectors of the MPD will be provided by a trigger system. Due to hardware limitations and signal propagation speed, the detectors are not triggered simultaneously with the moment of...
Forward Hadron Calorimeter (FHCal) is one of the basic detectors at MPD/NICA facility and intended for the measurement of the geometry of heavy nuclei collisions, namely, the centrality and the orientation of reaction plane. FHCal is placed in the forward rapidity region to measure the energy of non-interacting nucleons (spectators) of colliding ions. It consists of two equivalent arms...
Bose-Einstein interferometry of identical hadrons are known to be one of the key experimental tool to study space-time properties of the hot and dense nuclear matter (fireball) in heavy-ion collisions. However, hadron correlations capture the space-time evolution of the source at the freeze-out stage, when final-state hadrons are formed. On the other hand, direct photon correlation are...
Experimental discovery of the resonant-like states in di-J/ฯ and J/ฯ-ฯ(2S) mass specrta in pp-collisions near production threshold suggest the existence of the fully-charmed tetraquarks. Numerous theoretical models that followed the dicovery describe the observed data, speculate on the physics of the new states and predict new observations.
Further studies require precise experimental...
The Highly Granular Neutron Detector (HGND) has now been developed and constructed for the measurements of neutron yields and flow in nucleus-nucleus collisions in the BM@N experiment at the NICA accelerator complex. Its compact prototype was first used in the BM@N experiment to study collisions of 3.8A GeV $^{124}$Xe with a CsI target. The HGHD prototype consists of longitudinally...
One of the current tasks being carried out at the BM@N experiment involves categorizing event based on their centrality by using the energy of projectile spectators as measured by the FHCal. A precise procedure for determining the centrality allows estimating the initial geometry of the heavy ion collision and also gives the possibility to compare the results with model data and other...
The BM@N is a fixed-target experiment aimed at studying of heavy ion collisions at beam energies up to 4 A GeV. The new Highly Granular Neutron Detector (HGND) is being developed for this experiment. This detector will be able to carry unique measurements of flow of the neutrons. Due to these measurements it will be possible to explore the isospin degree of freedom of the QCD phase...
This work is devoted to the search for phi mesons after collision of Xe beams with a CsI target at E = 3.8 AGeV at the BM@N experiment (JINR, Dubna). Both MC and experimental data were analyzed and peaks in the invariant mass distribution corresponding to phi mesons were obtained. The future aim is to increase our understanding of the transition from baryonic matter to (quark-gluon plasma) QGP.
Collective flow is one of the most important observables sensitive to hot and dense matter produced in heavy ion collisions at the beam energy of several GeV. In 2023 Baryonic Matter at Nuclotron experiment conducted the first physical run collecting high-statistics data on Xe+CsI collisions at $E_{kin} = 3.8A$ GeV. We present the first results for directed flow of protons with respect to the...
Understanding the momentum distributions of the spectator fragments in relativistic nuclear collisions, such as those in the BM@N experiment (NICA), helps to estimate the acceptance of the zero-degree calorimeters and other forward detectors. BM@N is equipped with FHCal and SciWall, which can detect spectator nucleons and at least some spectator fragments [1]. In order to simulate this...
This work is devoted to the study of the simplest hypernuclei, namely
3Hฮ (consisting of one proton, one neutron, and one ฮ-hyperon) and
4Hฮ (consisting of one proton, two neutrons, and one ฮ-hyperon). They may be one of the possible markers of the phase transition from nuclear matter to quark-gluon plasma in high-energy ion collisions.
The aim of this work is to reconstruct the hypernuclei...
Inorganic scintillators BaF2 and LYSO:Ce are considered as candidates for use in the electromagnetic calorimeter of the Mu2e-II experiment. Doping BaF2 with yttrium allows to suppress its slow luminescence component but negatively impacts on radiation hardness of the crystal. In previous work we studied the influence of irradiation with fast neutrons on scintillation properties of the pure...
Exotic hadron states with quark content beyond conventional meson and baryon models are natural laboratory to study the properties of strong interaction. Charmonium-like state $Z_c(4200)$ with a potentially tetraquark structure was found as an intermediate state in $B^0 \to J/\psi K^{\pm} \pi^{\mp}$ decays. The large width of this state leads to significant interference effects with other...
Accurate geometric modeling of detector components is essential for optimizing performance and ensuring the reliability of experimental setups in high-energy physics. This report details the geometry simulation of the Zero-Degree Calorimeter (ZDC) which is an important component of the Spin Physics Detector (SPD) at the Nuclotron-based Ion Collider facility (NICA) currently under construction...
NOvA is an accelerator-based neutrino oscillation experiment. Using Fermilabโs Megawatt-capable NuMI beam and two functionally identical tracking calorimeter detectors, muon (anti)neutrino disappearance and electron (anti)neutrino appearance are studied. Accurate energy estimation is vital to make good measurements of oscillation parameters, since oscillations are a function of neutrino...
Neutrino physics has been actively researching for a few last decades and there is a wide variety of open questions. Neutrino oscillation parameters which are supremely important to measure are the charge-parity phase and the neutrino mass ordering. To provide the highest significant level of their values it is necessary to combine data taken from different types of experiments. Currently...
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid scintillator detector that is under construction in southern China. One of the main goals of the experiment is to determine the neutrino mass ordering. For this measurement, JUNO will use electron antineutrinos from eight nuclear reactors located at an optimized baseline of 52.5 km. To resolve fast oscillatory pattern in...
Two-neutrino double electron capture is a rare nuclear decay where two electrons are simultaneously captured from the atomic shells and two neutrinos are carried away.
The measurements of the energies of the emitted particles and the half-life of the 2EC2ฮฝ decay to the ground state are of great interest to nuclear physics. The model predictions for 2EC2ฮฝ half-life are based on the evaluation...
We performed numerical simulations to assess the impact of thermal fluctuations on coordinate determination accuracy in a Time Projection Chamber (TPC) detector filled with an Ar (90%) and CHโ (10%) gas mixture. Utilizing the Navier-Stokes and heat transfer equations, we modeled convective heat exchange and its effect on electron drift. Our methodology included simulating the temperature...
The NA64 experiment at the CERN SPS is designed to search for dark photons in events with missing energy. The most studied production mechanism is dark Bremsstrahlung through a vector mediator. Bremsstrahlung photons can convert to hard vector mesons in exclusive photoproduction processes, which then decay to dark matter (DM). The vector meson decays invisibly to DM via mixing with the dark...
This work is based on modeled data made for SPD experimental setup on NICA . One of the detector's parts is Straw Tracker (barrel and end-cap). A particle passing through the detector losses its energy during every interaction with straws. Every meaning of energy losses depends on the covered distance in Straw Tracker, the type of particle and its energy (impulse). Knowing meanings of energy...
In this work we propose an alternative method for finding New Physics in $CP$ violation, using the interference between penguin and tree amplitudes in the decay of $B^+ \to K^+ K^+ K^-$. We perform a Monte Carlo simulation of the Belle experiment $\Upsilon(4S)$ data (711 fb${}^{-1}$) of this process. Using these data, we compare the new method with the well-known โgolden modeโ $B \to \phi K$....
Today, Monte-Carlo models are actively used to study relativistic collisions of heavy ions. Scientists obtain a large amount of information about structure and properties of matter at extreme conditions in such collisions by studying the azimuthal distribution of secondary charged particles. The so-called azimuthal flows can provide information about the evolution of nuclear matter.
There...
In experiments on colliders, there are many effects that lead to degradation of measurement accuracy. The report examines the reasons for the appearance of some of them, as well as methods for taking them into account and correcting them. The analysis of the measurement of Drell-Yan angular polarization coefficients in the ะกMS experiment at the LHC (SMP-23-007) is used as example.
Complete one-loop QCD corrections to the process $q \bar{q} g \gamma \rightarrow 0$ are presented, specifically focusing on longitudinal polarization of protons, using the SANC framework. The helicity amplitudes for three channels have been derived: quark-antiquark annihilation, gluon Compton scattering, photon Compton scattering.
Furthermore, a numerical estimation of polarized...
Resistive plate chamber (RPC) is a type of gaseous detector which was developed in 1981 by R. Santonico and R. Cardarelli. RPCs are pivotal in cosmic ray research, offering precise timing and efficient muon detection. Their fast response allows accurate measurements of cosmic ray particle time of flight, aiding in energy and origin analysis. RPCsโ affordability and robustness make them ideal...
