2022/02/17 by Xing-Wei He, Hua-Rong Wei, H. R. Wei +14
Mathematics · Physics and Astronomy · #FOS: Physical sciences #Hadron #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Logarithm #Nuclear physics #Particle physics #Physics #Quantum mechanics #Quark #Spectral line #Stochastic processes and statistical mechanics #Theoretical and Computational Physics #Thermodynamics #Yield (engineering) #hep-ph
paper · pdf · doi:10.48550/arxiv.2202.08529
published in arXiv (Cornell University) (Cornell University) · 26 pages,11 figures. arXiv admin note: substantial text overlap with arXiv:2005.12598
arxiv created 2022/02/17 · openalex publication_date 2022/02/17 · arxiv updated 2022/02/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/08
We describe the transverse momentum spectra of π^±, K^±, p, and p produced in different centralities gold-gold (Au-Au) collisions at different collision energies range from 7.7 to 62.4 GeV by a two-component Erlang distribution. The fitting results are consistent with the experimental data, and the centrality- and energy-dependent yield ratios of negative to positive particles are obtained from the normalization constants. Based on the yield ratios, the energy- and centrality-dependent chemical potentials of light hadrons and quarks are extracted. The study shows that the dependences of the three types of particle yield ratios on centrality are not significant, especially for π. The logarithms of the three yield ratios show obvious linear dependence on 1/√sNN over a range from 7.7 to 62.4 GeV. The extracted chemical potentials show obvious dependence on energy, and decrease with the increase of energy. The dependences of the energy-dependent chemical potentials of light hadrons and quarks on centrality are relatively more obvious in low energy region. The derived curves of chemical potentials for all centralities, from the linear fits of the logarithms of yield ratios vs energy, have the extremum at the same energy of 3.526 GeV, which possibly is the critical energy of phase transition from a liquid-like hadron state to a gas-like quark state in the collision system. With the increase of energy, all types of chemical potentials become small and tend to zero at very high energy, which indicates that with the increase of energy, the hadronic interactions gradually fade and the partonic interactions gradually become greater.