BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Probing the nuclear matter equation of state with light nuclei DTSTART;VALUE=DATE-TIME:20241025T092500Z DTEND;VALUE=DATE-TIME:20241025T094000Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4338@cern.ch DESCRIPTION:Speakers: Viktar Kireyeu (JINR)\nWe investigate the sensitivit y of the light nuclei and hypernuclei production to the strongly interacti ng nuclei matter equation-of-state (EoS) within the Parton-Hadron-Quantum- Molecular Dynamics (PHQMD) microscopic transport approach.\n\nPHQMD is an n-body microscopic transport approach based on Quantum Molecular Dynamics (QMD) propagation of baryonic degrees of freedom\, where clusters are form ed through potential interactions between nucleons and hyperons. The Minim um Spanning Tree (MST) algorithm is employed to identify bound clusters ba sed on the baryon correlations in the coordinate space. In addition to thi s\, a 'kinetic' mechanism for deuteron production is incorporated\, utiliz ing the catalytic hadronic reactions that account for all isospin channels . This approach enhances the deuteron production while considering its qua ntum nature through the finite-size excluded volume effect and projection of the relative momentum of the interacting pair of nucleons onto the deut eron wave function\, leading to a significant reduction of deuteron produc tion\, especially at target/projectile rapidities.\n\nWe find that static density-dependent and momentum-dependent interactions\, although yielding the same EoS for cold matter\, have markedly different effects on observab les in heavy-ion collisions. We analyze their impact on the flow coefficie nts\, the transverse momentum spectra and the fragment yields of different clusters as a function of rapidity. Our results\, compared to HADES and S TAR BES data\, show a significant sensitivity of the elliptic flow coeffic ient to the momentum-dependent potential.\n\nFurthermore\, we propose a me thod to experimentally distinguish between various deuteron production mec hanisms in heavy-ion collisions across the range of energies from SIS to R HIC.\n\nhttps://indico.particle.mephi.ru/event/436/contributions/4338/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4338/ END:VEVENT BEGIN:VEVENT SUMMARY:On fragment spectra\, Hubble law and polarization of emitted secon dary particles in a hydrodynamic model for describing high-energy heavy io n collisions DTSTART;VALUE=DATE-TIME:20241024T141500Z DTEND;VALUE=DATE-TIME:20241024T143500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4356@cern.ch DESCRIPTION:Speakers: Alexander Dyachenko (Petersburg State Transport Univ ersity)\nA.T. D’yachenko$^{1\,2}$\n\n*$^{1}$ B.P. Konstantinov Petersbur g Nuclear Physics Institute of National Research Center "Kurchatov Instit ute"\, Gatchina\, Russia*\n\n*$^{2}$ Emperor Alexander I Petersburg State Transport University\, St. Petersburg\, Russia*\n\nBased on the nonequilib rium hydrodynamic approach [1\,2]\, double differential cross sections for the spectra of light fragments emitted in the FRAGM (ITEP) experiment [3\ ,4] in collisions of carbon nuclei with a beryllium target at energies of 300 and 950 MeV/nucleon are described. To describe the fragment yield\, th e coalescence model [5\,6] was used taking into account the Goldhaber fact orization [7]\n\n In the nonequilibrium hydrodynamic approach at high ener gies of colliding heavy ions\, the Hubble law for the resulting fireball d uring its expansion was studied and in this approximation agreement with t he results of calculations using the PHSD model [8] was obtained. \n\nTaki ng the Hubble law as a basis\, in the next approximation within the framew ork of hydrodynamics\, the average vorticity was found and the polarizatio n of the emitted particles in collisions of gold nuclei at an energy of G eV/nucleon was estimated. For the impact parameter fm\, the polarization turned out to be about 5%\, which is in agreement with the experimental da ta of the STAR collaboration for hyperons and calculations using the PHS D model [8]. This may be of interest for future experiments at the NICA co llider \n\n1. A.T. D’yachenko\, I.A. Mitropolsky\, Phys. Atom. Nucl. **8 5\,** 1053 (2022).\n2. A.T.D’yachenko\, Phys.Atom. Nucl. **87**\,. 125 ( 2024). \n3. A.A. Kulikovskaya et al.\, Phys.Atom.Nucl. **85**\, 466 (2022) . \n4. В.M. Abramov et al. Phys.Atom.Nucl. **81**\, 330 (2018).\n5. A.T. D'yachenko\, Nucl. Phys. A **626**\, 273 (1997).\n6. A.T.D’yachenko\, I. A. Mitropolsky\, Bull. Russ. Acad. Sci.: Physics **81**\, 1521 (2017).\n7. A. S. Goldhaber\, Phys. Lett. B **53**\, 306 (1974). \n8. M. Baznat\, O.V . Teryaev\, A\, V. Zinchenko\, Phys. Part. Nucl. Lett. **20**\,.407 (2023) .\n\nhttps://indico.particle.mephi.ru/event/436/contributions/4356/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4356/ END:VEVENT BEGIN:VEVENT SUMMARY:Anisotropic flow measurements of Λ hyperons: performance study fo r MPD and BM@N experiments at NICA energies. DTSTART;VALUE=DATE-TIME:20241025T101000Z DTEND;VALUE=DATE-TIME:20241025T102500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4352@cern.ch DESCRIPTION:Speakers: Valerii Troshin (JINR\, MEPhI)\nThe study of nuclear matter properties in the region of maximum baryonic density is one of the main goals of beam energy scanning programs in relativistic heavy ion col lisions with energies $\\sqrt{s}_{NN}=2.4-11$ GeV. Among the important ob servables in this study is the momentum anisotropy with respect to the rea ction plane\, characterized by anisotropic transverse flow coefficients.\n \nIn this work\, we discuss the first results of the BM@N Xe+CsI Run8 anal ysis and the efficacy of the invariant mass fitting method for measuring the anisotropic flow of Lambda hyperons with the MPD experiment at NICA.\n \nhttps://indico.particle.mephi.ru/event/436/contributions/4352/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4352/ END:VEVENT BEGIN:VEVENT SUMMARY:Modeling of charge particle correlations in nucleus-nucleus intera ctions at NICA and RHIC energies DTSTART;VALUE=DATE-TIME:20241025T095500Z DTEND;VALUE=DATE-TIME:20241025T101000Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4351@cern.ch DESCRIPTION:Speakers: Aleksei Chernyshov (SINP MSU)\nA model analysis of c harge particle correlations in relativistic heavy-ion collisions was perfo rmed at energies that are planned to be available at NICA. The charge bala nce function (CBF) was chosen as a measure of charge correlations. The CBF represents conditional probability density of a charged particle to be ob served at certain relative to its antiparticle rapidity and azimuthal angl e given the antiparticle was observed elsewhere. The CBF widths are sensit ive to charge separation duration in the system. It was shown that measure d by STAR experiment at RHIC dependencies of CBF rapidity widths on centra lity of Au+Au collisions at center-of-mass energies 7.7 and 11.5 GeV per n ucleon pair can be reproduced with HYDJET++ model. In order to achieve ade quate description of the experimental results an event-by-event charge con servation mechanism was introduced to the Monte-Carlo model HYDJET++\, and finite values of isospin\, strangeness and baryon chemical potentials wer e taken into account.\n\nhttps://indico.particle.mephi.ru/event/436/contri butions/4351/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4351/ END:VEVENT BEGIN:VEVENT SUMMARY:Modeling of alignment phenomenon in relativistic heavy ion collisi ons DTSTART;VALUE=DATE-TIME:20241025T094000Z DTEND;VALUE=DATE-TIME:20241025T095500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4353@cern.ch DESCRIPTION:Speakers: Aleksei Nikolskii (JINR\, MSU)\nThe kinematic descri ption of the azimuthal correlation of photon and hadron families is discus sed. This correlation\, also known as the alignment\, was first observed b y the Pamir collaboration in emulsion experiments with cosmic rays. At the qualitative level the alignment demonstrates the deviation of points from a straight line on the plane of the emulsion film. In our approach the hy pothesis of the relation between the alignment of spots and the selection procedure of the highest-energy particles itself together with the transve rse momentum conservation is tested in the framework of the HYDJET++ model . Event-by-event the transverse momentum conversation has been taken into account in the form of missing transverse momentum. It is shown that the h igh degree of alignment can appear at the reasonable values of transverse momentum disbalance of selected most energetic particles. \n\n1) Pamir Col laboration\, A. Borisov et al.\, in Proceedings of 4th International Sympo sium on Very High Energy Cosmic Ray Interactions\, Beijing\, ed. by D. Li nkai (1986)\, p. 4.\n\n2) I.P. Lokhtin\, A.V. Nikolskii\, \, A.M. Snigire v\, arXiv: 2406.06114. \n\n3) I.P. Lokhtin\, A.V. Nikolskii\, \, A.M. Sn igirev\, Eur. Phys. J. C 83\, 324 (2023)\, arXiv: 2301.07975. \n\n4) R.A. Mukhamedshin\, Eur. Phys. J. C 82\, 155 (2022)\, arXiv: 2207.13558. \n\n5 ) I. P. Lokhtin et al.\, Comput. Phys. Commun. 180\, 779 (2009).\n\nhttps: //indico.particle.mephi.ru/event/436/contributions/4353/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4353/ END:VEVENT BEGIN:VEVENT SUMMARY:Estimation of the isotopic spin influence on femtoscopic correlati ons of identical pions in Au+Au collisions in the UrQMD model DTSTART;VALUE=DATE-TIME:20241025T083000Z DTEND;VALUE=DATE-TIME:20241025T084500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4354@cern.ch DESCRIPTION:Speakers: Anna Kraeva (National Research Nuclear University ME PhI)\nOne of the main aims of relativistic nuclear physics is the search f or signs of\nformation\, quantitative evaluation and description of nuclea r matter properties\nunder extreme conditions. The characteristic of the s ystem created as a result\nof heavy-ion collisions can be explored via spa tial and temporal parameters\nobtained using the method of correlation fem toscopy. At low energies\, the size\nof the particle emission region is af fected by the isotopic spin. Studies of isospin effects on the reaction dy namics can provide a clearer estimate of the temporal characteristics of t he particle emission processes.\n\nIn this report\, the results on the mea surements of femtoscopic correla-\ntions will be presented for identical p ions produced in Au+Au collisions at\n$\\sqrt{s}_{NN} = 3$ GeV using the U rQMD (Ultrarelativistic Quantum Molecular\nDynamics) model. The influence of the initial system isospin on the femto-\nscopic parameters is demonstr ated and the implementation for experiments is\ndiscussed.\n\nhttps://indi co.particle.mephi.ru/event/436/contributions/4354/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4354/ END:VEVENT BEGIN:VEVENT SUMMARY:Global polarization of Xi hyperons in Au+Au collisions in the STAR experimant DTSTART;VALUE=DATE-TIME:20241025T090500Z DTEND;VALUE=DATE-TIME:20241025T092500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4355@cern.ch DESCRIPTION:Speakers: Egor Alpatov (NRNU MEPhI)\nIn non-central heavy-ion collisions emitted particles' spin can be polarized along the initial glob al angular \nmomentum due to spin-orbit coupling. Global polarization of h yperons is measured utilizing parity \nviolating weak decay of hyperons an d is used to probe the vortical properties of the \nsystem. \nThe STAR exp eriment at RHIC measured the global polarization of $\\Lambda$\nhyperons i n Au+Au collisions at $\\sqrt{s_{NN}}$ = 3-200 GeV\, and similar measureme nts \nwere conducted at the LHC for Pb+Pb collisions at $\\sqrt{s_{NN}}$ = 2.76 and 5.02 TeV. Measurement of multistrange hyperons have been only li mited to top RHIC energy.\n\nIn this talk\, we will report results of $\\X i$ global polarization for Au+Au collisions at $\\sqrt{s_{NN}}$ = 14.6\, 1 9.6 and $27\\ \\text{GeV}$. While $\\Lambda$ global polarization was measu red in wide energy range the energy dependence of \nmultistrange hyperon g lobal polarization can provide new experimental input for understanding vo rtical properties of matter in heavy-ion collisions.\n\nhttps://indico.par ticle.mephi.ru/event/436/contributions/4355/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4355/ END:VEVENT BEGIN:VEVENT SUMMARY:Magnetic and vortical impacts on the effective QCD phase diagram DTSTART;VALUE=DATE-TIME:20241025T084500Z DTEND;VALUE=DATE-TIME:20241025T090500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4357@cern.ch DESCRIPTION:Speakers: Luis Hernandez (Universidad Autonoma Metropolitana)\ nIn this talk\, we present a comprehensive analysis of chiral symmetry res toration using the Linear Sigma model coupled with quarks to illustrate th e effective QCD phase diagrams. Specifically\, we explore the temperature- baryon chemical potential plane\, incorporating magnetic field effects and investigating the impact of high vorticity on the QCD phase transition. O ur study aims to pinpoint the Critical End Point within these phase diagra ms. Additionally\, we discuss the potential implications of our findings f or relativistic heavy-ion collisions\, offering insights into the critical behavior and phase structure of QCD under extreme conditions.\n\nhttps:// indico.particle.mephi.ru/event/436/contributions/4357/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4357/ END:VEVENT BEGIN:VEVENT SUMMARY:The first results for directed flow of protons in Xe+Cs collisions at Ekin=3.8A GeV in the BM@N experiment DTSTART;VALUE=DATE-TIME:20241025T074500Z DTEND;VALUE=DATE-TIME:20241025T080000Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4350@cern.ch DESCRIPTION:Speakers: Mikhail Mamaev (NRNU MEPhI)\nHeavy ion collision at the energies of several A GeV is the only way to produce in laboratory hot and dense matter existing in massive astrophysical objects such as neutro n stars\, binary stellar collisions etc. In 2023 Baryonic Matter at Nuclot ron (BM@N) experiment collected the first physical data for Xe+CsI collisi ons at $E_{kin} = 3.8A$ GeV. Studying the observables from heavy ion colli sions can shed light on the properties of the matter created and establish its Equation of State (EOS). Collective motion of the produced in the col lision particles is one of such observables sensitive to the EOS of the pr oduced matter. We present the first results for directed flow of protons w ith respect to the spectator symmetry plane and compare the obtained resu lts with existing word data.\n\nhttps://indico.particle.mephi.ru/event/436 /contributions/4350/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4350/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of proton and light nuclei production in Ar-nucleus collisio ns in the BM@N experiment at NICA DTSTART;VALUE=DATE-TIME:20241025T073000Z DTEND;VALUE=DATE-TIME:20241025T074500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4349@cern.ch DESCRIPTION:Speakers: Vadim Kolesnikov (JINR)\nThe BM@N (Baryonic Matter a t Nuclotron) is a fixed-target detector for relativistic nuclear collision s at the NICA accelerator complex. The focus of the BM@N physics program i s the study of the production of hadrons and light (hyper)nuclei in nucleu s-nucleus interactions with energies up to 4A GeV. In this talk we present recent results on the production of protons\, deuterons\, and tritons in centrality selected argon-nucleus collisions at 3.2A GeV. Rapidity and tra nsverse momentum distributions of p\, d\, t over a large phase space regio n will be shown. System size dependence of particle yields and ratios in A r+A (A = C\, Al\, Cu\, Sn\, Pb) collisions will be discussed and tested ag ainst model predictions.\n\nhttps://indico.particle.mephi.ru/event/436/con tributions/4349/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4349/ END:VEVENT BEGIN:VEVENT SUMMARY:Performance for anisotropic flow measurement of inclusive photons and neutral pions in Bi+Bi collisions at 9.2 GeV with the MPD experiment DTSTART;VALUE=DATE-TIME:20241025T071500Z DTEND;VALUE=DATE-TIME:20241025T073000Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4348@cern.ch DESCRIPTION:Speakers: Oleg Golosov (NRC "Kurchatov Institute"\, NRNU MEPhI )\nDirect photons produced in electromagnetic processes in heavy ion colli sions do not interact with other particles in the collision zone. Analysis of direct photon anisotropic flow could provide additional information on the conditions at the production time and on the development of collectiv e flow. Direct photon flow is extracted based on flow and spectra of inclu sive photons and of neutral pions\, the main source of decay photons. More over\, results for neutral pion spectra and flow are interesting themselve s as they allow to constrain properties of hot and dense nuclear matter th anks to the robust particle identification and wide coverage in transverse momentum.\n\nWe present the performance for measurement of anisotropic fl ow for inclusive photon and neutral pion with the MPD experiment.\n\nhttps ://indico.particle.mephi.ru/event/436/contributions/4348/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4348/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of φ(1020)\, ρ(770) and K*(892) resonance production in Bi +Bi collisions at √sNN = 9.2 GeV in the MPD detector at NICA collider DTSTART;VALUE=DATE-TIME:20241025T070000Z DTEND;VALUE=DATE-TIME:20241025T071500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4347@cern.ch DESCRIPTION:Speakers: Dmitry Ivanishchev (SPbPU\, NRC «Kurchatov Institut e» - PNPI)\nMeasurement of properties of short-lived resonances produced in heavy-ion collisions plays an important role in study of the hot and de nse medium produced in such collisions. Due to short lifetimes of resonanc es a significant part of them decays in the fireball. This makes resonance s a unique tool for studying the evolution of the colliding system and rel ated phenomena: excessive yield of baryons at intermediate momentum\, flav or dependence of the parton energy loss\, enhanced strangeness production\ , rescattering and regeneration in the hadron gas and others.\nThe study o f resonance production in heavy ion collisions is an important part of the physical program of the MPD experiment at NICA. We present results of fea sibility studies for measurement of φ(1020)\, ρ(770) and K*(892) mesons production in Bi + Bi collisions at √sNN = 9.2 GeV using the MPD detecto r at NICA collider. Results are obtained using full-scale Monte Carlo simu lations of heavy-ion collisions and the experimental setup.\nWe acknowledg e support from the Russian Ministry of Education and Science\, state assig nment for fundamental research (code FSEG-2024-0033).\n\nhttps://indico.pa rticle.mephi.ru/event/436/contributions/4347/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4347/ END:VEVENT BEGIN:VEVENT SUMMARY:K*(892) meson production in Au+Au at $\\sqrt{s_{NN}}$ = 200 GeV DTSTART;VALUE=DATE-TIME:20241025T064500Z DTEND;VALUE=DATE-TIME:20241025T070000Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4346@cern.ch DESCRIPTION:Speakers: Sergei Antsupov (Peter the Great St.Petersburg Polyt echnic University\, Saint-Petersburg\, Russia)\nThe research on K*(892) me son production can lead to a new discoveries in properties of exotic state of matter called quark-gluon plasma (QGP) in which quarks and gluons are deconfined. Strangeness enhancement is one of the main observables of QGP which can be measured by studying the production of particles containing s trange quark(s). K*(892) meson is one of such particles. Production of K*( 892) can be described by it’s invariant $p_T$ spectra. Comparison of pro duction of K*(892) in heavy and in p+p collision systems can be shown by n uclear modification factors. Since QGP isn’t formed in p+p collisions at $\\sqrt{s_{NN}} = 200$ GeV strangeness enhancement can be observed throug h the nuclear modification factors.\n\nCurrent report is dedicated to meas urements of K*(892) mesons invariant $p_T$ spectra and nuclear modificatio n factors as functions of transverse momentum and centrality in Au+Au coll ision system at $\\sqrt{s_{NN}}= 200$ GeV.\nThe report can be considered a s a prototype of the research planned in the MPD experiment of the megapro ject NICA.\n\nWe acknowledge support from Russian Ministry of Education an d Science. State assignment for fundamental research (code FSEG-2024-0033) .\n\nhttps://indico.particle.mephi.ru/event/436/contributions/4346/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4346/ END:VEVENT BEGIN:VEVENT SUMMARY:Elliptic flow of $\\pi^{0}$ in $^3$He+Au and U+U collisions DTSTART;VALUE=DATE-TIME:20241025T063000Z DTEND;VALUE=DATE-TIME:20241025T064500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4345@cern.ch DESCRIPTION:Speakers: Egor Bannikov (Peter the Great St.Petersburg Polytec hnic University (SPbPU))\nHadronic matter in heavy-ion collisions can reac h extreme energy densities and undergo a phase transition into quark-gluon plasma (QGP) consisting of asymptotically free partons. One of the main w ays to investigate QGP’s properties is to measure the azimuthal particle anisotropy in momentum space. This anisotropy can be characterized by the elliptic flow ($v_2$).\n\nThe elliptic flow for charged hadrons was measu red by PHENIX experiment at RHIC in small collision systems (p/d$/^3$He+Au ). In the most central collisions\, azimuthal anisotropy can be described by relativistic hydrodynamics\, as in heavy-ion collisions. However\, $v_2 $ of charged hadrons in more peripheral collisions cannot be interpreted o nly as flow\, but has significant nonflow contribution\, which also depend s on transverse momentum ($p_T$). Since the production of $\\pi^0$ mesons can be measured up to high values of $p_T$\, the measurement of the $v_2$ values for $\\pi^0$ in $^3$He+Au collisions is considered unique tool to s tudy the interplay between flow and nonflow effects in small systems.\n\nT he second part of this report is devoted to the measurement of $v_2$ value s for $\\pi^0$ mesons in U+U collision system – the largest system at RH IC. Since the $^{238}$U nucleus is highly deformed\, the study of collisio ns of uranium nuclei is especially interesting from the point of view of s tudying jet-quenching effect. In heavy-ion collisions nonzero values of $v _2$ at high $p_T$ can be associated with partonic energy loss. This makes the elliptic flow of $\\pi^0$ meson\, which is measurable up to high $p_T$ \, effective tool to study jet-quenching effect in U+U collisions.\n\nThus \, the current report is dedicated to the measurement of $\\pi^0$ mesons e lliptic flow in $^3$He+Au and U+U collisions at $\\sqrt{s_{NN}}$=200 GeV a nd $\\sqrt{s_{NN}}$=193 GeV\, respectively\, as a function of transverse m omentum and centrality.\n\nThe report can be considered as a prototype of the research planned in the MPD experiment of the megaproject NICA. \n\nWe acknowledge support from Russian Ministry of Education and Science. State assignment for fundamental research (code FSEG-2024-0033).\n\nhttps://ind ico.particle.mephi.ru/event/436/contributions/4345/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4345/ END:VEVENT BEGIN:VEVENT SUMMARY:CALCULATING AZIMUTHAL FLOWS IN PB–PB AND XE–XE COLLISIONS WITH THE HYDJET++ MONTE CARLO GENERATOR AT THE LHC ENERGIES DTSTART;VALUE=DATE-TIME:20241025T060000Z DTEND;VALUE=DATE-TIME:20241025T061500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4344@cern.ch DESCRIPTION:Speakers: Danila Myagkov (MSU Faculty of Physics)\nNowadays\, research in the field of extreme states of matter is actively developing\, e.g. study of quark-gluon plasma. In this regard\, the comprehensive appl ication of various models that describe the phenomena occurring with matte r\, for example\, in relativistic collisions of heavy ions at the accelera tors\, is also developing. New methods of studying extreme conditions are being built\, and methods of working with them are being improved. One of these methods is the investigated study of nuclear collision using Monte C arlo generators.\n\nIn reality\, accelerators and detector complexes serve as a platform for such research. In our work\, we will focus mainly on th e results obtained by the CMS [1] collaboration working at the Large Hadro n Collider. Conducting research since 2010\, the CMS collaboration has alr eady published more than two hundreds scientific articles [2] on heavy io n physics. These articles discuss in detail various methods for calculatin g azimuthal fluxes of charged particles: the method of the true reaction p lane\, the second and fourth order cumulants\, two-particle correlations\, etc [3\,4]. This work will be devoted to the study of these methods and t heir implementation in the Monte Carlo generator HYDJET++ [5].\n\nHYDJET++ is a Monte Carlo model for generating relativistic collisions of heavy io ns. It includes a combination of two independent components: a soft hydrod ynamic part for low-energy particles and a hard part for jets and hadrons\ , taking into account the effect of their quenching due to energy losses i n a dense matter. Initially\, the azimuthal flows of charged particles in the HYDJET++ generator are calculated using the true reaction plane method [6]. In the current work\, we will demonstrate the results of integrating another methods into the HYDJET++ model.\n\nThe work considers methods fo r calculating azimuthal flows – elliptical v2 and triangular v3 – in c ollisions of lead and xenon ions. The reaction plane method involves findi ng the angle of the reaction plane and calculating harmonics relative to t his angle. The cumulant method\, accordingly\, implies the calculation of cumulants that take into account correlations between particles. With the help of these methods\, the calculation of flows is carried out\, and the results are compared with those similar in the work of the CMS collaborati on [3\,4].\n\nAs a result of the work\, the generation of relativistic col lisions of lead ions at an energy of √sNN = 5.36 TeV per nucleon pair in c.m.s. and xenon with an energy of √sNN = 5.44 TeV per nucleon pair in c.m.s. Elliptical v2 and triangular v3 flows were calculated using various methods. The methods were analyzed and the obtained results were compared with the results of the CMS experiment [3\,4]. This work will allow us to adjust the generator model in the future and identify areas in which the model does not perform well enough and future developing. \n\n1. S. Chatr chyan et al. (CMS Collaboration). The CMS experiment at the CERN LHC // J. Instrum. 2008. No. 3\, S08004.\n2. CMS Collaboration. CMS heavy-ion physi cs publications http://cms-results.web.cern.ch/cms-results/public-results/ publications/HIN/\n3. S. Pandey\, B. K. Singh. Anisotropic flow and correl ations between azimuthal anisotropy Fourier harmonics in Xe–Xe collision s at √sNN = 5.44 TeV under HYDJET++ framework // Journal of Physics G: Nuclear and Particle Physics\,2022 // arXiv:2107.01880. 2021.\n4. S. Pande y\, B.K. Singh. Transverse momentum spectra and suppression of charged had rons in deformed Xe–Xe collisions at √sNN = 5.44 TeV using HYDJET++ m odel // arXiv:2210.08527. 2022.\n5. I. P. Lokhtin\, L. V. Malinina\, S. V. Petrushanko\, A. M. Snigirev\, I. Arsene\, K. Tywoniuk. Heavy ion event g enerator HYDJET++ (HYDrodynamics plus JETs) // Comput. Phys. Commun. 2009. V. 180\, 779.\n6. Д. А. Мягков\, С. В. Петрушанко. Э ллиптический и триангулярный потоки зар яженных частиц в релятивистских столкно вениях ядер Xe и Pb в модели HYDJET++ и экспери менте CMS (LHC) // Учен. зап. физ. фак-та Моск. у н-та. 2023. № 3. 2330205.\n\nhttps://indico.particle.mephi.ru/event/4 36/contributions/4344/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4344/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of the beam energy dependence of anisotropic flow using the scaling relations. DTSTART;VALUE=DATE-TIME:20241025T061500Z DTEND;VALUE=DATE-TIME:20241025T063000Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4343@cern.ch DESCRIPTION:Speakers: Arkadiy Taranenko (NRNU MEPhI)\nAnisotropic flow mea surements of produced particles in relativistic heavy-ion collisions play an essential role in the studies of transport properties of the strongly i nteracting matter. In this work we provide the results of the most compreh ensive systematic study of the beam energy dependence of anisotropic flow based on existing data and discuss them using different scaling relations for azimuthal anisotropy.\n\nhttps://indico.particle.mephi.ru/event/436/co ntributions/4343/ LOCATION: Petrovskiy 1 URL:https://indico.particle.mephi.ru/event/436/contributions/4343/ END:VEVENT BEGIN:VEVENT SUMMARY:Methods for centrality determination of Xe+Cs(I) collisions at $E_ {kin}=3.8A$ GeV at BM@N DTSTART;VALUE=DATE-TIME:20241024T153500Z DTEND;VALUE=DATE-TIME:20241024T155000Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4333@cern.ch DESCRIPTION:Speakers: Alexander Demanov ()\nThe centrality that describes the initial collision geometry is crucial for interpreting experimental da ta on heavy ion collisions.\nWe present the procedures of centrality dete rmination for the Baryonic Matter at Nuclotron (BM@N) experiment based on the multiplicities of produced particles. The validity of the procedures is assessed using the experimental data for Xe+Cs(I) collisions at beam k inetic energy of 3.8 A GeV.\n\nhttps://indico.particle.mephi.ru/event/436/ contributions/4333/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4333/ END:VEVENT BEGIN:VEVENT SUMMARY:Collective effects in string models: machine learning perspective DTSTART;VALUE=DATE-TIME:20241024T152000Z DTEND;VALUE=DATE-TIME:20241024T153500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4334@cern.ch DESCRIPTION:Speakers: Evgeny Andronov (Saint Petersburg State University)\ nThis work focuses on exploring the potential of machine learning methods in relativistic nuclear physics to differentiate between various physical theories\, and consequently\, gain a deeper understanding of the underlyin g physical processes in ultra-high-energy nuclear collisions.\nRecent find ings from modeling p+p and AA interactions within the color string fusion framework suggest that it may be possible to describe the experimental azi muthal asymmetry event-by-event in a unified way across different collidin g systems. This description becomes possible by considering two mechanisms of string interactions: 1) changes in the strength of the color field in the area where strings overlap in the transverse plane\, and 2) Lorentz bo osts applied to particles resulting from string motion due to mutual attra ction. We demonstrate that it is possible to train machine learning algori thms using pT-φ distributions from event-by-event data in order to distin guish between different sources of collective behaviour.\n\nThis work was supported by the Russian Science Foundation under grant no.23-72-01061.\n\ nhttps://indico.particle.mephi.ru/event/436/contributions/4334/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4334/ END:VEVENT BEGIN:VEVENT SUMMARY:Phase diagram of two and three color QCD with various imbalances DTSTART;VALUE=DATE-TIME:20241024T150500Z DTEND;VALUE=DATE-TIME:20241024T152000Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4335@cern.ch DESCRIPTION:Speakers: Roman Zhokhov (IHEP Protvino\, IZMIRAN Troitsk)\nPha se diagram of two color and three color QCD are reviewed. The dualities of QCD phase diagram are discussed in both two and three color cases. It h as been shown that the phase diagram of two color QCD is quite helpful and it has a lot of common features with three color one\, and predictions re cently made in two color QCD was shown to hold qualitatively in real three color QCD. Showing that two color QCD is indeed great lab to study dense quark matter. The dualities has been shown in two color QCD. Duality betwe en chiral symmetry breaking and charged pion condensation phenomena has be en demonstrated from first principles in QCD itself. Also there will be d iscussed color superconductivity phenomenon and the influence of chiral im balance on its properties.\n\nDespite the fact that the thermodynamic pote ntial in three color case ($N_c=3$) does not have properties of all three dualities found in the two-color case\, it turned out that the phase portr ait qualitatively contains these dualities.\n\nhttps://indico.particle.mep hi.ru/event/436/contributions/4335/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4335/ END:VEVENT BEGIN:VEVENT SUMMARY:Self-similarity and Cumulative Hadron Production in Heavy Ion Col lisions at High Energies DTSTART;VALUE=DATE-TIME:20241024T145000Z DTEND;VALUE=DATE-TIME:20241024T150500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4336@cern.ch DESCRIPTION:Speakers: Mikhail Tokarev (Joint Institute for Nuclear researc h)\nSearch for signatures of phase transitions and determination of phase diagram of nuclear matter created in A+A collisions are in the heart of th e heavy ion programs performed present at RHIC\, LHC and future experiment s at NICA and FAIR.\nIn the paper the hypothesis of the self-similarity of hadron production in relativistic heavy-ion collisions to search for the phase transition in nuclear matter is discussed. Using the established fea tures of z-scaling is suggested to reveal the signatures of new physics in the cumulative region. Selection of the cumulative events is assumed to e nrich data sample by a new type of collisions characterized by higher ener gy density and more compressed matter. We expect that this would allow fin ding clearer signatures of phase transition\, location of a critical point and studying extreme conditions in heavy ion collisions. The change in th e parameters of the theory (a specific heat and fractal dimensions) near t he critical point is considered a signature of new physics. The results of data analysis of cumulative production in p+A and A+A collisions in colli der and fixed target mode are discussed.\n\n1. M.Tokarev and I.Zborovský\ , Phys. Part. Nucl. Lett.\, 7 (2010) 160.\n2. M.Tokarev\, I.Zborovský and A.A.Aparin\, Phys. Part. Nucl. Lett.\, 12 (2015) 324.\n3. M.Tokarev\, A.K echechyan\, and I.Zborovský\, Nucl. Phys.\, A 993 (2020) 121646).\n4. M.T okarev and I.Zborovský\, Nucl. Phys.\, A1025 (2022) 122492.\n\nhttps://in dico.particle.mephi.ru/event/436/contributions/4336/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4336/ END:VEVENT BEGIN:VEVENT SUMMARY:Direct Photon Production and Correlations in Pb-Pb Collisions at $ \\sqrt{s_{NN}} = 5.02$ TeV DTSTART;VALUE=DATE-TIME:20241024T143500Z DTEND;VALUE=DATE-TIME:20241024T145000Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4337@cern.ch DESCRIPTION:Speakers: Vladislav Kuskov ()\nExperimental studies in the rec ent decades have provided strong evidence for the formation of hot and den se nuclear matter in heavy-ion collisions. Such matter is predicted by Qua ntum Chromodynamics (QCD) to be a quark-gluon plasma (QGP) consisting of d econfined quarks and gluons. Direct photons\, which are not originating fr om hadron decays\, are one of the key experimental observables of QGP. At low transverse momenta ($p_{\\mathrm{T}}$)\, an exponential spectrum of th ermal direct photons ($p_{\\rm{T}}\\le 2$ GeV/$c$) captures features of sp ace-time evolution of the QGP expansion and the hadronic gas. Additionally \, the thermal direct photon spectrum could be expanded down to lower $p_{ \\mathrm{T}}$ using correlations of soft photons. Hanbury Brown and Twiss (HBT) correlation of direct photons can shed light on the space-time prope rties of QGP. ALICE is capable to measure photons in wide range of $p_{\\m athrm{T}}$\, exploiting detectors the tracking system for measurements of photon conversion into $e^+e^-$ pairs. High-$p_{\\mathrm{T}}$ photons are measured with electromagnetic calorimeters EMCal and PHOS. In this talk\, the direct photon production and HBT correlations in Pb--Pb collisions at $\\sqrt{s_{NN}} = 5.02$ TeV with ALICE are reported.\n\nhttps://indico.par ticle.mephi.ru/event/436/contributions/4337/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4337/ END:VEVENT BEGIN:VEVENT SUMMARY:Multiplicity-dependent properties of multipatcile production at hi gh energy in extended multipomeron exchange model DTSTART;VALUE=DATE-TIME:20241024T140000Z DTEND;VALUE=DATE-TIME:20241024T141500Z DTSTAMP;VALUE=DATE-TIME:20260814T164049Z UID:indico-contribution-222-4339@cern.ch DESCRIPTION:Speakers: Vladimir Kovalenko (Saint Petersburg State Universit y)\nA new generalization of the Multipomeron exchange model (MEM) [1-3] fo r pp collisions is proposed\, taking into account the effect of event-by-e vent string tension fluctuations [4]. It is shown that the new version of the MEM correctly reproduces the characteristic thermal behavior of $p_\\m athrm{T}$ spectra in a wide energy range. In addition\, the new generaliza tion of the MEM improves the description of multiplicity distributions by replacing the Poisson distribution from one string with the discrete Gauss ian distribution [5]. Calculations show that the new version of the MEM co rrectly reproduces the characteristic oscillating behavior of modified com binants in pp collisions over a wide energy range [5]. Simultaneously\, th e $p_\\mathrm{T}$-multiplicity correlation functions are shown to be satis factorily described together with the multiplicity-dependent $p_\\mathrm{T }$ spectrum [6]. Possible applications of the new model for describing the relativisti heavy-ion collisions and opportunities for experiments at the NICA collider (Dubna) are discussed.\n\nThe authors acknowledge Saint-Pet ersburg State University for a research project 95413904.\n\n1. Armesto\, N.\; Derkach\, D.A.\; Feofilov\, G.A. p(t)-multiplicity correlations in a multi-Pomeron-exchange model with string collective effects. Phys. Atom. N ucl. 2008\, 71\, 2087–2095. https://doi.org/10.1134/S1063778808120090\n\ n2. Bodnia\, E.\; Derkach\, D.\; Feofilov\, G.\; Kovalenko\, V.\; Puchkov\ , A. Multi-pomeron exchange model for pp and $p\\bar{p}$ collisions at ult ra-high energy. PoS QFTHEP2013 2013\, 60. https://doi.org/10.22323/1.183.0 060\n\n3. Kovalenko\, V.\; Feofilov\, G.\; Puchkov\, A.\; Valiev\, F. Mult ipomeron Model with Collective Effects for High-Energy Hadron Collisions. Universe 2022\, 8\, 246. https://doi.org/10.3390/universe8040246\n\n4. Bia las\, A. Fluctuations of the string tension and transverse mass distributi on. Phys. Lett. B. 1999\, 466\, 301–304. https://doi.org/10.1016/S0370-2 693%2899%2901159-4\n\n5. Vechernin\, V.\; Andronov\, E.\; Kovalenko\, V.\; Puchkov\, A. Multiplicity Distributions and Modified Combinants in the Mu ltipomeron Model of pp Interaction at High Energies. Universe 2024\, 10\, 56. https://doi.org/10.3390/universe10020056\n\n6. Acharya\, S. et al. Mul tiplicity dependence of charged-particle production in pp\, p-Pb\, Xe-Xe a nd Pb-Pb collisions at the LHC. Phys. Lett. B 2023\, 138110 https://doi.or g/10.1016/j.physletb.2023.138110\n\nhttps://indico.particle.mephi.ru/event /436/contributions/4339/ LOCATION: Moskvorechye 2 URL:https://indico.particle.mephi.ru/event/436/contributions/4339/ END:VEVENT END:VCALENDAR