In this work, we introduce a novel method for Particle Identification (PID) within the scope of the MPD experiment at the NICA accelerator complex of Joint Institute for Nuclear Research. Identifying products of ultrarelativisitc collisions produced in the heavy-ion experiments is one of the crucial objectives of most of the physics analysis. The principal challenge for PID is to provide good...
This study addresses the challenge associated with estimating the impact parameter of heavy-ion collisions using data from microchannel plate detectors for future NICA experiments [1-3]. The primary issue arises from the dependence of algorithms quality on the choice of event generator model, specifically QGSM [4], EPOS [5], and PHQMD [6], which were investigated in our work.
To resolve this...
The Highly Granular Neutron Detector (HGND) is designed for the BM@N experiment, aimed at investigating neutron emission in heavy ion collisions at beam energies of up to 4A GeV. The HGND allows the identification of neutrons and the reconstruction of their energies using time-of-flight method, which is crucial for analyzing neutron yields and azimuthal flow. Given the challenging energy range...
One of the priority tasks being solved in the experiments BM@N and MPD at the NICA accelerator complex is to classify events into centrality classes. The centrality procedure allows us to estimate the initial geometry in heavy ion collisions using the relation between the observable and the impact parameter. The observable is usually the multiplicity of produced charged particles or the energy...
В моделировании столкновений тяжелых ионов на высоких энергиях широко применяются Монте-Карло генераторы, такие как HYDJET++[1], сочетающий гидродинамическое описание мягкой компоненты событий с отдельным моделированием жестких процессов. Этот Монте-Карло генератор широко использовался для воспроизведения, например, результатов эксперимента CMS [2], также применялся для ускорителя RHIC и...
At the beginning of the 21st century, a new phase state of strongly interacting matter was established, known as the quark-gluon plasma (QGP). To study the formation of the QGP in collisions of heavy nuclei, the solution of a system of equations of relativistic hydrodynamics with a specific equation of state (EoS) is typically employed.
Lattice Quantum Chromodynamics (LQCD) is an effective...
Upcgen is a dedicated Monte Carlo event generator for simulation of dilepton production and vector meson photoproduction processes in ultraperipheral collisions (UPCs).
The dilepton production cross section in UPCs is calculated by folding the elementary $\gamma\gamma \to \ell \ell$ cross section with the photon fluxes produced by the colliding nuclei. These photon fluxes are modeled using...
In this talk, we present preliminary results of our study of heavy flavor (HF) transport in the evolving medium produced in p+p collisions at LHC energies. The findings are obtained using event-by-event simulations in a hybrid approach that combines multiple methods to model different stages of the interaction.
The investigation addresses the open question of Quark Gluon Plasma (QGP)...
Many experiments in high energy physics use the URQMD model at the design stage, for predictions of experimental data and also for analysis of the obtained results. We used the new version of the URQMD 3.4 model to analyze the experimental data of the NA61/SHINE collaboration. We obtained that the UrQMD 3.4 model reproduces the data on π±, K-, proton and anti-proton production in 40Ar + 45Sc...
In the development of the nonequilibrium hydrodynamic approach [1-3], we were able to successfully describe the double differential cross sections for the formati. on of cumulative protons and light fragments of deuterons and tritons emitted at an angle of 400 and studied in [4] for the collision of carbon nuclei in the reaction 12C+12C at an energy of 20 GeV per nucleon on a fixed target,...
The state of strong interacting matter consisting of asymptotically free quarks and gluons is called a quark-gluon plasma (QGP). This state can be created in relativistic collisions of heavy ions [1]. High-energy partons (quarks and gluons) produced in hard interactions propagate in QGP and lose energy, after which they fragment into hadrons. This leads to the suppression of the hadron yields...
One of the goals of the BM@N experiment is to study the equation of state (EoS) of dense nuclear matter in heavy-ion collisions with energies up to 4.65A GeV. The EoS includes a symmetry energy term that characterises the isospin asymmetry of nuclear matter, which is important for studying the properties of astrophysical objects such as neutron stars. The neutron to proton ratio and the...
At present the resonance peak $D_{IJ} = D_{03}$ observed by WASA@COSY in the total cross section of the reaction of two-pion production in the isoscalar channel of the reaction pn → d$\pi^0\pi^0$[1], is considered as one of the most realistic candidate to the dibaryon resonance [2]. Here I=0 is the isospin and $J^P=3^+$ is the total angular momentum and parity of this resonance. A similar...
Direct photons produced in electromagnetic processes in heavy ion collisions do not interact with other particles in the collision zone. Analysis of direct photon spectra and anisotropic flow could provide additional information on the conditions at the production time and on the development of collective flow. Spectra and flow of direct photons are quantified based on the corresponding...
One of the primary objectives of beam energy scan programs involving relativistic heavy-ion collisions at energies of √sNN=2-5 GeV is to investigate the high-density equation of state (EoS) and explore potential phase transitions in dense baryonic matter. This talk will be dedicated to a performance study of differential anisotropic flow measurements for identified charged hadrons at T=2.5A...
Multi-Purpose Detector (MPD) at NICA collider is designed to study heavy-ion collisions in the energy range 4-11 GeV. Physics program of the MPD can be extended to lower energies 2.4-3.5 GeV by detecting collisions of one of the NICA beams with a fixed target installed in the beam pipe. The fixed target configuration also provides high event rate even at low beam intensities, which may be a...
Идентификация частиц, рождающихся в столкновениях ионов в коллайдере NICA, является одной из базовых функций Многоцелевого детектора (MPD) (1). Основными средствами идентификации в MPD являются времяпролетная система (TOF) и время-проекционная камера (TPC). В докладе приводится сравнительный анализ различных алгоритмов идентификации частиц данными детекторными системами.
Сравнение методов...
This work presents a comprehensive analysis of charged-particle multiplicity distributions in relativistic heavy-ion collisions, focusing on systems and energies relevant to the first stages of NICA collider experimental program (Bi+Bi, Xe+Xe, and Xe+W). Utilizing three theoretical frameworks—the Glauber two-component model [1], the Color Glass Condensate (CGC) [2], and the EKRT saturation...
The main goals of the Multi-Purpose Detector (MPD) at Nuclotron-based Ion Collider Facility (NICA, Dubna, Russia) are the investigation of the phase diagram of QCD matter at high baryon densities and search for transition of nuclear matter into a deconfined state of quarks and gluons, known as the Quark-Gluon Plasma (QGP). The MPD will be constructed in two stages, with the first stage...
The region of nucleus-nucleus collision energies $\sqrt{s_{NN}}\approx$ 2-10 GeV is very attractive for the detailed study of the phase diagram of strongly interacting matter, where the first-order phase transition and the existence of the critical endpoint (CEP) are predicted by the QCD. So far, the experimental investigations carried out in this energy range at SPS and at RHIC have shown no...
Measurements of the anisotropic collective flow of particles produced in relativistic heavy ion collisions play an important role in the study of the transport properties of strongly interacting matter. In this paper we present the results of the most complete systematic study of the dependence of the anisotropic collective fluxes on the collision energy from 2.4 GeV to 11 GeV based on the...
In this topic, the discussion will focus on vorticity and acceleration of the nuclear medium created in heavy-ion collisions at the NICA complex energies. These phenomena will be analyzed within the framework of the Parton-Hadron-String Dynamics (PHSD) model. The vorticity field is the object of study due to its connection to the spin polarization and also due to its intricate space-time...
Study of hot and dense baryon-rich matter is a central point of the BM@N [1] and MPD [2] experiments at NICA facility. Both experiments are equipped with forward detectors capable to measure the energies of spectator nucleons and nuclear fragments representing remnants of initial nuclei beyond their hot overlap region (fireball) [1, 2]. The signals from the forward detectors can be used...
A dominant role of photon exchange over pomeron one in forward large rapidity gap events in proton-nucleus collisions at LHC energies is discussed. Relative contributions via coherent and incoherent pomeron-exchange and photon-exchange processes for forward large rapidity gap events in pPb collisions [1,2,3] and their A- and Z-dependences are estimated from the recent data on diffractive pp...
Measurement of the direct-photon spectrum provides a unique tool for testing QCD predictions and for investigating properties of the hot matter created in nucleus—nucleus collisions. Direct photons are produced in all stages of the collision, interact with hot matter only electromagnetically and leave the hot region almost without rescattering. Direct-photon spectrum at high pT imposes...
This report presents an overview of the latest results and research methodology of the search for Higgs boson decay into Dark Matter particles, during the process of Higgs boson production in the vector boson fusion [1]. The results were obtained in the ATLAS experiment at the Large Hadron Collider (LHC) using data collected during the Run II of LHC ($\sqrt{s}$ = 13 TeV) and were interpreted...
We study the behavior of the average transverse energy density (<dEt/dy>) of various identified particles produced at midrapidity in relativistic nucleus-nucleus collisions vs. the collision energy from RHIC to LHC. The analysis covers pions and 3 types of particles with strangess: kaons, φ-mesons (1020) and Ω-hyperons (Ω⁻ and anti-Ω⁺) identified in central Au+Au and Pb+Pb collisions at...
In non-central collisions, a large orbital angular momentum is deposited into the system, generating vorticity that aligns hyperon spins through spin-vorticity coupling.
A newly collected dataset of Au+Au collisions at $\sqrt{s_\mathrm{NN}}$ = 7.7, 9.2, 11.5, 14.6, 17.3, 19.6, and 27 GeV from the second phase of the RHIC Beam Energy Scan (BES-II), obtained with upgraded detector systems,...
Quantum entanglement, which is the most fascinating feature of quantum world, is commonly investigated through two-photon maximally entangled states, known as Bell states. Conventionally, entanglement probing relies on measuring polarization correlations between photons. While such correlations are often interpreted as inherently quantum phenomena, theoretical analysis and Monte Carlo...
