17 research outputs found
Description of bulk observables in Au+Au collisions at top RHIC energy in the integrated HydroKinetic Model
The results on the main bulk observables obtained in the simulations within
the integrated hydrokinetic model (iHKM) of Au+Au collisions at the RHIC energy
GeV are presented along with the corresponding experimental
data from the STAR and the PHENIX collaborations. The simulations include all
the stages of the collision process: formation of the initial state, its
gradual thermalization and hydrodynamization, viscous relativistic
hydro-evolution, system's hadronization and particlization, and, finally, an
expansion of the interacting hadron-resonance gas. The model gives a
satisfactory description of charged-particle multiplicities, particle number
ratios, transverse momentum spectra for pions, kaons, protons and antiprotons,
charged-particle coefficients, and femtoscopy radii at all collision
centralities. It is demonstrated how one can estimate the times of the pion and
kaon maximal emission from the femto-scales.Comment: 17 pages, 14 figure
Description of bulk observables in Au+Au collisions at top RHIC energy in the integrated HydroKinetic Model
The results on the main bulk observables obtained in the simulations within
the integrated hydrokinetic model (iHKM) of Au+Au collisions at the RHIC energy
GeV are presented along with the corresponding experimental
data from the STAR and the PHENIX collaborations. The simulations include all
the stages of the collision process: formation of the initial state, its
gradual thermalization and hydrodynamization, viscous relativistic
hydro-evolution, system's hadronization and particlization, and, finally, an
expansion of the interacting hadron-resonance gas. The model gives a
satisfactory description of charged-particle multiplicities, particle number
ratios, transverse momentum spectra for pions, kaons, protons and antiprotons,
charged-particle coefficients, and femtoscopy radii at all collision
centralities. It is demonstrated how one can estimate the times of the pion and
kaon maximal emission from the femto-scales.Comment: 17 pages, 14 figure
Space-time structure of particle emission and femtoscopy scales in ultrarelativistic heavy-ion collisions
The analysis of the spatiotemporal picture of particle radiation in
relativistic heavy-ion collisions in terms of correlation femtoscopy scales,
emission and source functions allows one to probe the character of evolution of
the system created in the collision. Realistic models, like the integrated
hydrokinetic model (iHKM), used in the present work, are able to simulate the
entire evolution process of strongly interacting matter produced in high-energy
nuclear collision. The mentioned model describes all the stages of the system's
evolution, including formation of the very initial state and its consequent
gradual thermalization, hydrodynamic expansion and afterburner hadronic
cascade, that can help researchers to figure out the specific details of the
process and better understand the formation mechanisms of certain observables.
In the current paper we investigate the behavior of the pion and kaon
interferometry radii and their connection with emission functions in
ultrarelativistic heavy-ion collisions at the Large Hadron Collider within
iHKM. We are focusing on the study of the emission time scales at different
energies for both particle species (pions and kaons) aiming to get deeper
insight into relation of these scales and the peculiarities of the mentioned
system's collective expansion and decay with the experimentally observed
femtoscopy radii. One of our main interests is the problem of the total
system's lifetime estimation based on the femtoscopy analysis.Comment: 28 pages, 9 figures. "Author edition" of the recently published
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Quantum local-equilibrium state with fixed multiplicity constraint and Bose-Einstein momentum correlations
The one- and two-boson momentum spectra are derived in the quantum
local-equilibrium canonical ensemble of noninteracting bosons with a fixed
particle number constraint. We define the canonical ensemble as a subensemble
of events associated with the grand-canonical ensemble. Applying simple
hydro-inspired parametrization with parameter values that correspond roughly to
the values at the system's breakup in collisions at the LHC energies, we
compare our findings with the treatment which is based on the grand-canonical
ensembles where mean particle numbers coincide with fixed particle numbers in
the canonical ensembles. We observe a significantly greater sensitivity of the
two-particle momentum correlation functions to fixed multiplicity constraint
compared to one-particle momentum spectra. The results of our analysis may be
useful for interpretation of multiplicity-dependent measurements of
collision events.Comment: 27 pages, 8 figure
Femtoscopy scales and particle production in the relativistic heavy ion collisions from Au+Au at 200 AGeV to Xe+Xe at 5.44 ATeV within the integrated hydrokinetic model
The recent results on the main soft observables, including hadron and photon
yields and particle number ratios, spectra, flow harmonics, as well as
the femtoscopy radii, obtained within the integrated hydrokinetic model (iHKM)
for high-energy heavy-ion collisions are reviewed and re-examined. The cases of
different nuclei colliding at different energies are considered: Au+Au
collisions at the top RHIC energy GeV, Pb+Pb collisions at
the LHC energies TeV and TeV, and the
LHC Xe+Xe collisions at TeV. The effect of the initial
conditions and the model parameters, including the utilized equation of state
(EoS) for quark-gluon phase, on the simulation results, as well as the role of
the final afterburner stage of the matter evolution are discussed. The possible
solution of the so-called ``photon puzzle'' is considered. The attention is
also paid to the dependency of the interferometry volume and individual
interferometry radii on the initial transverse geometrical size of the system
formed in the collision.Comment: 34 pages, 18 figure
The femtoscopy scales in Au+Au collisions at the top RHIC energy
The results on the main bulk observables obtained in the simulations within the integrated hydrokinetic model (iHKM) of Au+Au collisions at the RHIC energy √ sNN = 200 GeV are presented along with the corresponding experimental data from the STAR and the PHENIX collaborations. The simulations include all the stages of the collision process: formation of the initial state, its gradual thermalization and hydrodynamization, viscous relativistic hydro-evolution, system's hadronization and particlization, and, finally, an expansion of the interacting hadron-resonance gas. The model gives a satisfactory description of charged-particle multiplicities, particle number ratios, transverse momentum spectra for pions, kaons, (anti)protons, lambdas, xi, and omega, charged-particle coefficients, and femtoscopy radii at all collision centralities. It is demonstrated how one can estimate the times of the pion and kaon maximal emission from the femto-scales
Space-time picture and observables in heavy ion collisions at the Large Hadron Collider energies
In the present work, we combine and systemize the results of our recent research activity aiming to reveal the spatiotemporal structure of those extremely hot, dense, and rapidly expanding systems, which form in ultrarelativistic heavy ion collisions, as well as to reproduce in computer simulations the experimentally measured bulk observables. The latter include hadronic yields, particle number ratios, transverse momentum spectra, νn coefficients, and the femtoscopy scales, calculated for different collision energies within the integrated hydrokinetic model. We investigate how our simulation results depend on the model tuning, in particular, the utilized equation of state for quark-gluon matter and discuss the effect of the post-hydrodynamic stage of the system's evolution on the observables formation
Femtoscopic structure of relativistic heavy ion collisions in the integrated hydrokinetic model
—The theoretical description of the femtoscopy scales in ultrarelativistic heavy-ion collisions at different energies and for different colliding ion pairs (Au + Au collisions at the top RHIC energy GeV, Pb + Pb collisions at the LHC energies and TeV, the LHC Xe + Xe collisions at TeV) is provided within the integrated HydroKinetic model (iHKM). The comparison of the model simulation results, obtained for the considered collision types at the similar values of the mean charged particle multiplicity shows that the magnitudes of the corresponding interferometry radii depend not only on , but also on the geometric sizes of the colliding nuclei