Extracting kinetic freeze-out temperature and radial flow velocity from an improved Tsallis distribution
Hai-Ling Lao1, Fu-Hu Liu1* and Roy A. Lacey2
1 Institute of Theoretical Physics, Shanxi University, 030006, Shanxi, China
2 Departments of Chemistry & Physics, Stony Brook University, 11794, Stony Brook, NY, USA
* e-mail: fuhuliu@163.com
Published online: 6 March 2017
We analyze the transverse-momentum (pT) spectra of identified particles ( , , p, and ) produced in gold-gold (Au-Au) and lead-lead (Pb-Pb) collisions over a (center-of-mass energy per nucleon pair) range from 14.5 GeV (one of the Relativistic Heavy Ion Collider (RHIC) energies) to 2.76 TeV (one of the Large Hadron Collider (LHC) energies). For the spectra with a narrow pT range, an improved Tsallis distribution which is in fact the Tsallis distribution with radial flow is used. For the spectra with a wide pT range, a superposition of the improved Tsallis distribution and an inverse power law is used. Both the extracted kinetic freeze-out temperature (T0) and radial flow velocity ( ) increase with the increase of , which indicates a higher excitation and larger expansion of the interesting system at the LHC. Both the values of T0 and in central collisions are slightly larger than those in peripheral collisions, and they are independent of isospin and slightly dependent on mass.
Kinetic freeze-out temperature and flow velocity extracted from transverse momentum spectra of final-state light flavor particles produced in collisions at RHIC and LHC
Excitation functions of parameters in Erlang distribution, Schwinger mechanism, and Tsallis statistics in RHIC BES program
Transverse momentum and pseudorapidity distributions of final-state particles and spatial structure pictures of an interacting system in p-Pb collisions at TeV
An evidence of mass-dependent differential kinetic freeze-out scenario observed in Pb-Pb collisions at 2.76 TeV
pT spectra in pp and AA collisions at RHIC and LHC energies using the Tsallis-Weibull approach