Kaon and pion femtoscopy at the highest energies available at the BNL Relativistic Heavy Ion Collider (RHIC) in a hydrokinetic model

Abstract

The hydrokinetic approach, that incorporates hydrodynamic expansion of the systems formed in A+A collisions and their dynamical decoupling, is applied to restore the initial conditions and space-time picture of the matter evolution in central Au+Au collisions at the top RHIC energy. The analysis is based on the detailed reproduction of the pion and kaon momentum spectra and femtoscopic data in whole interval of the transverse momenta studied by both STAR and PHENIX collaborations. The fitting procedure utilizes the two parameters: the maximal energy density at supposed thermalization time 1 fm/c and the strength of the pre-thermal flows developed to this time. The quark-gluon plasma and hadronic gas is supposed to be in complete local equilibrium above the chemical freeze-out temperature $T_{ch}$ = 165 MeV with the equation of states (EoS) at high temperatures as in the lattice QCD. Below $T_{ch}$ the EoS in the expanding and gradually decoupling fluid depends on the composition of the hadron-resonance gas at each space-time point and accounts for decays of resonances into the non-equilibrated medium. A good description of the pion and kaon transverse momentum spectra and interferometry radii is reached at both used initial energy density profiles motivated by the Glauber and Color Glass Condensate (CGC) models, however, at different initial energy densities. The discussion as for the approximate pion and kaon $m_T$-scaling for the interferometry radii is based on a comparison of the emission functions for these particles.

31 pages, 3 figures

References in corpus (13)

• Some Features of the Glasma
• Hydrodynamic Models for Heavy Ion Collisions
• Space-time evolution of bulk QCD matter
• Core-Corona Separation in Ultra-Relativistic Heavy Ion Collisions
• Energy density of the Glasma
• Chemical freeze-out in ultra-relativistic heavy ion collisions at sqrt(s)_NN = 130 and 200 GeV
• Importance of Granular Structure in the Initial Conditions for the Elliptic Flow
• Strangeness production from SPS to LHC
• Free-streaming approximation in early dynamics of relativistic heavy-ion collisions
• Fast hadron freeze-out generator, part II: noncentral collisions
• Hydro-kinetic approach to relativistic heavy ion collisions
• Thermalization of a color glass condensate and review of the "Bottom-Up" scenario
• Causal relativistic hydrodynamics for viscous fluids

Cited by in corpus (10)

• Uniform description of bulk observables in the hydrokinetic model of A+A collisions at RHIC and LHC
• Influence of temperature dependent shear viscosity on elliptic flow at back- and forward rapidities in ultrarelativistic heavy-ion collisions
• Femtoscopy correlations of kaons in $Pb+Pb$ collisions at LHC within hydrokinetic model
• Initialization of hydrodynamics in relativistic heavy ion collisions with an energy-momentum transport model
• Constraining the equation of state with identified particle spectra
• Description of bulk observables in Au+Au collisions at top RHIC energy in the integrated HydroKinetic Model
• Azimuthally integrated HBT parameters for charged pions in nucleus-nucleus interactions versus collision energy
• Photon spectra and anisotropic flow in heavy ion collisions at the top RHIC energy within the integrated hydrokinetic model with photon hadronization emission
• Are back-to-back particle--antiparticle correlations observable in high energy nuclear collisions?
• Identical-particle (pion and kaon) femtoscopy in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV with Therminator2 modeled with (3+1)D viscous hydrodynamics