A new generalization of the Multipomeron exchange model (MEM) [1-3] for pp collisions is proposed, taking into account the effect of event-by-event string tension fluctuations [4]. It is shown that the new version of the MEM correctly reproduces the characteristic thermal behavior of $p_\mathrm{T}$ spectra in a wide energy range. In addition, the new generalization of the MEM improves the...
A.T. D’yachenko$^{1,2}$
$^{1}$ B.P. Konstantinov Petersburg Nuclear Physics Institute of National Research Center "Kurchatov Institute", Gatchina, Russia
$^{2}$ Emperor Alexander I Petersburg State Transport University, St. Petersburg, Russia
Based on the nonequilibrium hydrodynamic approach [1,2], double differential cross sections for the spectra of light fragments emitted in the...
Search for signatures of phase transitions and determination of phase diagram of nuclear matter created in A+A collisions are in the heart of the heavy ion programs performed present at RHIC, LHC and future experiments at NICA and FAIR.
In the paper the hypothesis of the self-similarity of hadron production in relativistic heavy-ion collisions to search for the phase transition in nuclear...
Phase 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 has 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 recently made in two color QCD was shown to hold qualitatively in real three color QCD. Showing that...
This 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 underlying physical processes in ultra-high-energy nuclear collisions.
Recent findings from modeling p+p and AA interactions within the color string fusion framework suggest that it may...
Nowadays, research in the field of extreme states of matter is actively developing, e.g. study of quark-gluon plasma. In this regard, the comprehensive application of various models that describe the phenomena occurring with matter, for example, in relativistic collisions of heavy ions at the accelerators, is also developing. New methods of studying extreme conditions are being built, and...
Anisotropic flow measurements of produced particles in relativistic heavy-ion collisions play an essential role in the studies of transport properties of the strongly interacting matter. In this work we provide the results of the most comprehensive systematic study of the beam energy dependence of anisotropic flow based on existing data and discuss them using different scaling relations for...
Hadronic matter in heavy-ion collisions can reach extreme energy densities and undergo a phase transition into quark-gluon plasma (QGP) consisting of asymptotically free partons. One of the main ways to investigate QGP’s properties is to measure the azimuthal particle anisotropy in momentum space. This anisotropy can be characterized by the elliptic flow ($v_2$).
The elliptic flow for charged...
The research on K(892) meson 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 strange quark(s). K(892) meson is one of such particles. Production of...
Measurement of properties of short-lived resonances produced in heavy-ion collisions plays an important role in study of the hot and dense medium produced in such collisions. Due to short lifetimes of resonances a significant part of them decays in the fireball. This makes resonances a unique tool for studying the evolution of the colliding system and related phenomena: excessive yield of...
Direct photons produced in electromagnetic processes in heavy ion collisions 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 collective flow. Direct photon flow is extracted based on flow and spectra of inclusive photons and of neutral...
Heavy 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 neutron stars, binary stellar collisions etc. In 2023 Baryonic Matter at Nuclotron (BM@N) experiment collected the first physical data for Xe+CsI collisions at $E_{kin} = 3.8A$ GeV. Studying the observables from heavy ion...
One of the main aims of relativistic nuclear physics is the search for signs of
formation, quantitative evaluation and description of nuclear matter properties
under extreme conditions. The characteristic of the system created as a result
of heavy-ion collisions can be explored via spatial and temporal parameters
obtained using the method of correlation femtoscopy. At low energies, the size
of...
In this talk, we present a comprehensive analysis of chiral symmetry restoration using the Linear Sigma model coupled with quarks to illustrate the 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. Our study aims to pinpoint the...
In non-central heavy-ion collisions emitted particles' spin can be polarized along the initial global angular
momentum due to spin-orbit coupling. Global polarization of hyperons is measured utilizing parity
violating weak decay of hyperons and is used to probe the vortical properties of the
system.
The STAR experiment at RHIC measured the global polarization of $\Lambda$
hyperons in Au+Au...
The kinematic description of the azimuthal correlation of photon and hadron families is discussed. This correlation, also known as the alignment, was first observed by 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 hypothesis...
A model analysis of charge particle correlations in relativistic heavy-ion collisions was performed at energies that are planned to be available at NICA. The charge balance function (CBF) was chosen as a measure of charge correlations. The CBF represents conditional probability density of a charged particle to be observed at certain relative to its antiparticle rapidity and azimuthal angle...
The 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 collisions with energies $\sqrt{s}_{NN}=2.4-11$ GeV. Among the important observables in this study is the momentum anisotropy with respect to the reaction plane, characterized by anisotropic transverse flow coefficients.
In this...
