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- Title
Centrality Dependence of Chemical Freeze-Out Parameters and Strangeness Equilibration in RHIC and LHC Energies.
- Authors
Biswas, Deeptak
- Abstract
We have estimated centrality variation of chemical freeze-out parameters from yield data at midrapidity of π ± , K ± and p , p ¯ for collision energies of RHIC (Relativistic Heavy Ion Collider), Beam Energy Scan (RHIC-BES) program, and LHC (Large Hadron Collider). We have considered a simple hadron resonance gas model and employed a formalism involving conserved charges (B , Q , S) of QCD for parameterization. Along with temperature and three chemical potentials (T , μ B , μ Q , μ S ), a strangeness undersaturation factor ( γ S ) has been used to incorporate the partial equilibration in the strange sector. Our obtained freeze-out temperature does not vary much with centrality, whereas chemical potentials and γ S seem to have a significant dependence. The strange hadrons are found to deviate from a complete chemical equilibrium at freeze-out at the peripheral collisions. This deviation appears to be more prominent as the collision energy decreases at lower RHIC-BES energies. We have also shown that this departure from equilibrium reduces towards central collisions, and strange particle equilibration may happen after a threshold number of participants in A - A collision.
- Subjects
RELATIVISTIC Heavy Ion Collider; SUBSTANCE abuse; LARGE Hadron Collider; STRANGE particles; CENTRALITY; HEAVY ion collisions
- Publication
Advances in High Energy Physics, 2021, p1
- ISSN
1687-7357
- Publication type
Article
- DOI
10.1155/2021/6611394