The search for the predicted first-order phase transition and the corresponding critical endpoint between the hadronic matter and quark-gluon plasma is one of the most important current challenges in high-energy physics. This problem can be addressed based on the fluctuations of e.g. net-baryon number, net-charge, or net-strangeness number measured in relativistic heavy-ion collisions. The...
Two-component hydrodynamic model with jets, HYDJET++, is employed to analyse the data on elliptic flow correlations at low (pT < 1.25 GeV/c) and high (pT > 14 GeV/c) transverse momenta in Pb+Pb collisions at \sqrt{sNN} = 5.02 TeV. Because of these two mechanisms, describing soft and hard processes, the model calculations restored by the four-cumulant method reproduce the centrality dependence...
We propose and test a fast method to compute cumulants in hydrodynamic simulations of heavy-ion collisions. They comprise one of the promising tools to investigate the existence and location of the QCD critical point, as fluctuations should diverge near it. However, evaluating these from event-by-event hydrodynamic simulations is a time-consuming task, since it requires very large statistics....
The influence of initial state fluctuations on elliptic e2 and triangular e3 eccentricities and on elliptic v2 and triangular v3 flows in relativistic heavy ion collisions is studied within three Monte Carlo models. The models are based on (i) number of participant nucleons, (ii) number of binary collisions, and (iii) partonic energy density in color glass condensate (CGC) phase,...
The production of (anti)deuterons in relativistic heavy-ion collisions is currently well described by two models that point to different mechanisms of particle creation. The first of the two, the coalescence model, describes the (anti)deuteron’s creation as a result of final-state interactions among (possibly off-shell) nucleons after the chemical freeze-out. The second, the thermal model...
The study of femtoscopic correlations of photon pairs, emitted from heavy-ion collisions, can serve as an unique probe of the evolution of the source in space and time. Unlike commonly used charged particles photons are not subject to strong, nor electromagnetic interactions. These properties imply no distortion of the information carried by $γ$ from the point of their creation up to the...
The study of nucleon-nucleon (N-N), nucleon-hyperon (N-Y), and hyperon-hyperon (Y-Y) interactions are fundamental to understanding the physics of relativistic heavy-ion collisions and neutron stars the existence of various exotic hadrons. Geometry and dynamics of the particle-emitting source in heavy-ion collisions can be inferred via the femtoscopy method. Two-particle correlations at small...
The primary goal of the ultrarelativistic heavy-ion collision program at the LHC is to recreate the quark-gluon plasma (QGP) and study its properties. However, the lack of knowledge on the initial conditions of heavy-ion collision results in a significant uncertainty of the extraction of the transport properties of QGP. Recently, it has been realized that the generation of transverse momentum...
In the RHIC Beam Energy Scan program, gold nuclei are collided with different collision energies in the range from few to 62.4 GeV. The goals of the program are to explore the onset of QGP creation, locate the critical point of QCD and study dense baryon matter.
In this talk, we report on the first application of 3D Monte Carlo Glauber (GLISSANDO2) and TrENTO p=0 initial states for 3D...
In the recent decades of high energy physics, it was revealed that in ultra-realistic ion-ion collisions, a strongly interacting quark-gluon plasma (sQGP) is created. One of the most important goals of NA61/SHINE is to investigate and understand the phase structures of this matter. The investigation of the phase-diagram can be achieved by varying the collision energy or by changing the...
The search for the QCD critical point is one of the main topics in high-energy nuclear collisions. There are active studies aiming to find signals of the QCD critical point and the first order phase transition, such as the BES programs at the Relativistic Heavy-Ion Collier (RHIC), and many future experiments such as FAIR, NICA, J-PARC-HI, and HIAF. For detecting the signals of the critical...
Two-particle normalized cumulants of particle number correlations ($R_{2}$) and transverse momentum correlations ($P_{2}$) measured as a function of relative pseudorapidity and azimuthal angle difference $(\Delta\eta, \Delta\varphi)$ provide key information about particle production mechanism, diffusivity, charge and momentum conservation in high-energy collisions. To complement the recent...
The azimuthal correlations among local flow planes at forward, middle and backward (pseudo)-rapidities have been measured with the observable of factorization ratio derivative $F_2$ for heavy-ion collisions at LHC and RHIC energies. The physical dynamics for the longitudinal decorrelation have not been determined. To study various longitudinal dynamics, we introduce an observable for the...
We analyze the behavior of cumulants of conserved charges in a subvolume of a thermal system with exact global conservation laws by extending [1] a recently developed [2] subensemble acceptance method (SAM) to multiple conserved charges. Explicit expressions for all diagonal and off-diagonal cumulants up to sixth order that relate them to the grand canonical susceptibilities are obtained. The...
