Description
https://zoom.us/j/95372952282
We present the first measurements of diffraction in $\sqrt{s_{NN}}=8.16$ TeV proton-lead collisions with CMS. The very large angular coverage of CMS is used to tag rapidity gaps in the forward regions on both the proton-going and lead-going sides to identify both pomeron-lead and pomeron-proton topologies. The present data provide essentially unique information for understanding the high...
In the present investigation, using effective Lagrangian approach, we investigate the shift in the mass of $J/\psi$ state. The in-medium mass of $J/\psi$ state is evaluated through the consideration of intermediate pseudoscalar $D$ and $\bar{D}$ mesons to the $J/\psi$ self energy. The impact of medium is incorporated through the in-medium mass of $D$ meson calculated using chiral SU(3) model...
Thermal photons serve as valuable probes of the hot and dense medium produced in heavy ion collisions. The effective thermal photon temperature measured at RHIC and LHC energies far exceeds the temperature predicted for the phase space transition into the deconfined state of quarks and gluons, known as quark-gluon plasma (QGP). Direct photon measurements in heavy ion collisions at the future...
Anisotropic transverse flow is one of the main observables in the study of strongly interacting matter created in nucleus-nucleus collisions. Spatial asymmetry of overlapping region of two ions transforms due to particles interaction into momentum anisotropy of produced hadrons. Comparison of measured azimuthal anisotropy with theoretical calculations allows to extract properties of the...
Heavy flavor production is an ideal tool to study the properties of
the QCD medium created at the Relativistic Heavy Ion Collider (RHIC)
and the Large Hadron Collider (LHC). The kinematic coverage and
production mechanisms of the heavy flavor are different between RHIC
and LHC. The PHENIX experiment has a comprehensive physics program
which studies open heavy flavor and quarkonium production...
Multi-particle cumulants of azimuthal angle correlations have been compelling tools to probe the properties of the Quark-Gluon Plasma (QGP) created in the ultra-relativistic heavy-ion collisions and the search for the QGP in small collision systems at the LHC. However, only very few of them are available and have been studied in theoretical calculations and experimental measurements, while the...
The NA61/SHINE experiment at the CERN SPS has recently extended its
program for the energy scan with Pb ions. In the past, the NA49
experiment, which preceded NA61/SHINE, also recorded data for
Pb-Pb collisions at different energies. Together, the two experiments
cover a wide range of beam energies provided by the CERN SPS in the range 13 - 150 A GeV/c. Analysis of the new NA61/SHINE data and...
Femtoscopic correlations of two identical charged pions and kaons are measured in pp collisions at sqrt(s)=13 TeV by the ALICE collaboration at the Large Hadron Collider (LHC) to probe the space-time characteristics of particle production. High multiplicity pp collisions at the LHC reach particle densities comparable to those measured in peripheral heavy-ion collisions. A decrease of...
The Quark-Gluon Plasma (QGP), appearing in non-central nuclear-nuclear collisions is generated with large orbital angular momentum. Spin-orbit coupling alignes spin directions of produced particles with system angular momentum, known as vorticity. Properties of hyperon weak decays lead to the way of measuring polarization, that reflects vorticity. The global polarization of $\Lambda$ and...
One of the main goals of ultra-relativistic nuclear collisions is to create a new state of matter called quark-gluon plasma (QGP) and study its properties. One of the experimental observables is the anisotropic flow $v_n$, defined as correlation of azimuthal angle of each particle with respect to a common symmetry plane $\Psi_n$. The $v_n$ and $\Psi_n$ represent the magnitude and the phase of...
We present the result of the femtoscopic analysis of non-identical charged kaon correlations in Pb-Pb collisions at √sNN=2.76TeV obtained in ALICE at the LHC. One-dimensional K+K- correlation functions were analyzed in three centrality classes and eight transverse momentum ranges. The femtoscopic correlations of K+K- pairs are the result of Coulomb final-state interactions and formation of...
Simulations of peripheral Au+Au collisions at NICA energies was performed in the PHSD transport model. The properties of velocity and vorticity fields, hydrodynamic helicity was studied at different impact parameters and energies. The general structure of velocity field follows the "little bang" pattern which may be quantified by the velocity dependence allowing to extract the "Hubble"...
A new strategy [1] to analyze the chemical freeze-out of light (anti-,hyper-)nuclei produced in high energy collisions of heavy atomic nuclei within an advanced formulation of the hadron resonance gas model will be presented. This strategy is based on two different, but complementary approaches to model the hard-core repulsion between the light (anti-,hyper-)nuclei and hadrons. The first...
In this work the transverse momentum spectra and nuclear modification factor for heavy ion collisions are derived using Tsalllis non-extensive statistics in relaxation time approximation. The Boltzmann-Gibbs Blast Wave (BGBW) function is used as the equilibrium function and Tsallis function is used as the initial distribution function while solving the Boltzmann transport equation in the...
It has been dozen years since HYDJET++ Monte-Carlo event generator for the simulation of relativistic heavy ion collisions was developed. Now the generator is widely used for the simulation of nucleus-nucleus interactions from NICA to LHC energies. The model calculations on soft and hard probes of quark-gluon plasma (including collective flow, different kinds of particle correlations, jets,...
Our study is motivated by the first experimental results on pion production and stopping obtained in pA collisions in E910 experiment at BNL [1]. The effect of stopping is the decelera-tion of an incident high energy proton traversing the target nucleus. It appears due to the energy losses relevant to the production of secondary particles in the inelastic interactions with nucleons. The...
Recently it has been shown that in the large-Nc limit (Nc is the number of colors of quarks) there exist duality correspondences
(symmetries) in the phase portrait, which are the symmetries of the thermodynamic potential and the phase structure
itself. The first one is a duality between the chiral symmetry breaking and the charged pion condensation
phenomena. And there are two other dualities...
The shear viscosity is calculated microscopically via
the Green-Kubo relation in the various snapshots in the central region
in an ongoing relativistic collision simulated via the UrQMD framework
for various bombarding energies in the anticipated NICA experiments.
In previous works the shear
viscosity was calculated as function of temperature, while the chemical
potential of baryon charge was...
Hadronic resonance production plays an important role both in elementary and in heavy-ion collisions.
In heavy-ion collisions, since the lifetimes of short-lived resonances are comparable with
the lifetime of the late hadronic phase, regeneration and rescattering effects become
important and resonance ratios to longer lived particles can be used to estimate
the time interval between the...
The main goal of NICA project is the study of dynamics of quark-hadron phase transitions at the energy range $\sqrt{s_{NN}}$=7.7-11.5~GeV. The analysis of factorial moments of particle multiplicity, which characterize the size and power of particle clusterization in the phase space, was performed with the hybrid model vHLLE+UrQMD. The model represents the combination of viscous hydrodynamics...
Recent results for high multiplicity pp and p-Pb collision systems have revealed that they exhibit collective-like behaviors. These were formerly thought to be achievable only in heavy-ion collisions. To understand the origins of these unexpected phenomena, event shape observables such as transverse spherocity ($S_{\rm{0}}$) and the relative transverse activity classifier ($R_{\rm{T}}$) can be...
Hadron production in $p$+$p$, $p$+A, A+A collisions provides a look inside Quark Gluon Plasma, allowing to study its properties and characteristics, which is one of the main objectives in the field of high-energy nuclear physics. PHENIX has performed measurements of $π^0$, $η$, $K_S$, $K^*$, $φ$ and $ω$ meson production in $p$+$p$, $p$+Al, $p$ ($d$,$^3$He)+Au, Cu+Cu, Cu+Au, Au+Au and U+U...
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 metter.
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...
The beam energy scan program has been carried out by STAR experiment at the
Relativistic Heavy Ion Collider to search for the onset of deconfinement and a possible critical point where the transition from a Quark Gluon Plasma to a hadronic phase changes from a rapid cross over to a first-order phase transition. Azimuthal anisotropy of produced particles is one of the important observables...
The Compressed Baryonic Matter experiment (CBM) at FAIR aims to study the area of the QCD phase diagram at high net baryon densities and moderate temperatures using collisions of heavy ions at center-of-mass energies of a few GeV per nucleon. Anisotropic transverse flow is among the key observables to study the properties of matter created in such collisions. The CBM performance for charged...
In heavy-ion collisions particle-emitting source appears. It is important to understand how the emission source size would change with different collision species. It can be studied using femtoscopy technique, since femtoscopy allows to measure spatial and temporal characteristics of the particle-emitting source.
In this talk, we present one-dimensional source radii of charged pions...
The MPD/NICA heavy ion experiment is now under construction in Dubna, Russia. The centrality is the global characteristic of the nuclear interaction that reflects the degree of the nuclei overlapping or the number of interacting nucleons. One of methods to measure the centrality is the determination of the number of non-interacting projectile fragments or spectators, which have the very...
Centrality is an important concept in a study of strongly interacting matter created in a heavy-ion collision which evolution depends on its initial geometry. Experimentally collisions can be characterized by the measured multiplicities or energy of produced particles at midrapidity or spectator fragments emitted in the forward rapidity region. Relation between collision geometry and...
Forward hadron calorimeters in heavy ion experiments are used to determine the centrality and orientation of reaction plane in nucleus-nucleus collisions. In BM@N and MPD@NICA experiments hadron calorimeters with a beam hole in the center will be used, which is motivated by high radiation doses at the BM@N and by the design of the MPD collider experiment. This feature makes it impossible to...
The BM@N (Baryonic Matter at the Nuclotron) is an experiment at the NICA (Nuclotron-based Ion Collider fAcility). The first physics runs were carried out with the collection of experimental data in 2018. For the physics analysis of events recorded by detectors of the BM@N the BmnRoot framework is used.It provides a powerful tools for detector performance studying, event simulation, data...
