Centrality Dependence of Chemical Freeze-Out Parameters and Strangeness Equilibration in RHIC and LHC Energies
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 reson...
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Wiley
2021-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2021/6611394 |
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| author | Deeptak Biswas |
| author_facet | Deeptak Biswas |
| author_sort | Deeptak Biswas |
| collection | DOAJ |
| description | 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,μB,μQ,μS), a strangeness undersaturation factor (γS) 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 γS 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. |
| format | Article |
| id | doaj-art-e820e2bcd26f429ebffa9fbe6d598cc0 |
| institution | Kabale University |
| issn | 1687-7357 1687-7365 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
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| series | Advances in High Energy Physics |
| spelling | doaj-art-e820e2bcd26f429ebffa9fbe6d598cc02025-02-03T01:00:15ZengWileyAdvances in High Energy Physics1687-73571687-73652021-01-01202110.1155/2021/66113946611394Centrality Dependence of Chemical Freeze-Out Parameters and Strangeness Equilibration in RHIC and LHC EnergiesDeeptak Biswas0Department of Physics, Center for Astroparticle Physics & Space Science Bose Institute, EN-80, Sector-5, Bidhan Nagar, Kolkata 700091, IndiaWe 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,μB,μQ,μS), a strangeness undersaturation factor (γS) 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 γS 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.http://dx.doi.org/10.1155/2021/6611394 |
| spellingShingle | Deeptak Biswas Centrality Dependence of Chemical Freeze-Out Parameters and Strangeness Equilibration in RHIC and LHC Energies Advances in High Energy Physics |
| title | Centrality Dependence of Chemical Freeze-Out Parameters and Strangeness Equilibration in RHIC and LHC Energies |
| title_full | Centrality Dependence of Chemical Freeze-Out Parameters and Strangeness Equilibration in RHIC and LHC Energies |
| title_fullStr | Centrality Dependence of Chemical Freeze-Out Parameters and Strangeness Equilibration in RHIC and LHC Energies |
| title_full_unstemmed | Centrality Dependence of Chemical Freeze-Out Parameters and Strangeness Equilibration in RHIC and LHC Energies |
| title_short | Centrality Dependence of Chemical Freeze-Out Parameters and Strangeness Equilibration in RHIC and LHC Energies |
| title_sort | centrality dependence of chemical freeze out parameters and strangeness equilibration in rhic and lhc energies |
| url | http://dx.doi.org/10.1155/2021/6611394 |
| work_keys_str_mv | AT deeptakbiswas centralitydependenceofchemicalfreezeoutparametersandstrangenessequilibrationinrhicandlhcenergies |