1,607 research outputs found
Particle production at energies available at the CERN Large Hadron Collider within evolutionary model
The particle yields and particle number ratios in Pb+Pb collisions at the LHC
energy TeV are described within the integrated
hydrokinetic model (iHKM) at the two different equations of state (EoS) for the
quark-gluon matter and the two corresponding hadronization temperatures,
MeV and MeV. The role of particle interactions at the final
afterburner stage of the collision in the particle production is investigated
by means of comparison of the results of full iHKM simulations with those where
the annihilation and other inelastic processes (except for resonance decays)
are switched off after hadronization/particlization, similarly as in the
thermal models. An analysis supports the picture of continuous chemical
freeze-out in the sense that the corrections to the sudden chemical freeze-out
results, which arise because of the inelastic reactions at the subsequent
evolution times, are noticeable and improve the description of particle and
number ratios. An important observation is that although the particle number
ratios with switched-off inelastic reactions are quite different at different
particlization temperatures which are adopted for different equations of state
to reproduce experimental data, the complete iHKM calculations bring very close
results in both cases.Comment: 12 pages, 4 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
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
Femtoscopy correlations of kaons in collisions at LHC within hydrokinetic model
We provide, within the hydrokinetic model, a detailed investigation of kaon
interferometry in collisions at LHC energy (
TeV). Predictions are presented for 1D interferometry radii of and
pairs as well as for 3D femtoscopy scales in out, side and
long directions. The results are compared with existing pion interferometry
radii. We also make predictions for full LHC energy.Comment: 12 pages, 6 figure
Tubular initial conditions and ridge formation
The 2D azimuth & rapidity structure of the two-particle correlations in
relativistic A+A collisions is altered significantly by the presence of sharp
inhomogeneities in superdense matter formed in such processes. The causality
constraints enforce one to associate the long-range longitudinal correlations
observed in a narrow angular interval, the so-called (soft) ridge, with
peculiarities of the initial conditions of collision process. This study's
objective is to analyze whether multiform initial tubular structures,
undergoing the subsequent hydrodynamic evolution and gradual decoupling, can
form the soft ridges. Motivated by the flux-tube scenarios, the initial energy
density distribution contains the different numbers of high density tube-like
boost-invariant inclusions that form a bumpy structure in the transverse plane.
The influence of various structures of such initial conditions in the most
central A+A events on the collective evolution of matter, resulting spectra,
angular particle correlations and v_n-coefficients is studied in the framework
of the HydroKinetic Model (HKM).Comment: 18 pages, 6 figures, the paper to be published in Advances of High
Energy Physics (2013, in press
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