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Thermodynamic properties at the kinetic freeze-out in the Au + Au and Cu + Cu collisions at the RHIC using the Tsallis distribution

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Nuclear Science and Techniques 2023年第10期34卷 73-82页

作者： Wei-Hao Wu Jun-Qi Tao Hua Zheng Wen-Chao Zhang Xing-Quan Liu Li-Lin Zhu Aldo Bonasera School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710119China Key Laboratory of Quark and Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Institute of Nuclear Science and Technology Sichuan UniversityChengdu 610064China Department of Physics Sichuan UniversityChengdu 610064China Cyclotron Institute Texas A&M UniversityCollege StationTX 77843USA Laboratori Nazionali del Sud INFN95123 CataniaItaly

The thermodynamic properties of charged particles,such as the energy density,pressure,entropy density,particle density,and squared speed of sound at the kinetic freeze-out in the Au+Au collisions from the relativistic heavy ion collider (RHIC)beam energy scan program √S_(NN) and in the Cu+Cu collisions at √S_(NN),200 GeV are studied using the thermodynamically consistent Tsallis *** energy density,pressure,and particle density decrease monotonically with the collision energy for the same collision centrality;These properties also decrease monotonically from the central to peripheral collisions at the same collision *** the scaled energy densityε∕T^(4) and scaled entropy density s∕T^(3) demonstrate the opposite trend with the collision energy for the same collision *** is a correlation betweenε∕T^(4) and s∕T^(3) at the same *** addition,the squared speed of sound was calculated to determine that all the collision energies share nearly the same value at different collision centralities.

关键词： Heavy-ion collision Tsallis distribution kinetic freeze-out Energy density Entropy density Particle density Squared speed of sound Pressure

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Centrality Dependence of K~*(892)~0 and φ(1020) Production at LHC

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Communications in Theoretical Physics 2017年第10期67卷 500-504页

作者： Inam-ul Bashir Saeed Uddin Department of Physics Jamia Millia Islamia (Central University) New-Delhi

We study the centrality dependence of the mid-rapidity （｜y｜〈 0.5） yields and transverse momentum distributions of K＊（892）° and φ（1020） resonances produced in Pb ＋ Pb collisions at SNN= 2.76 TeV. The mid- rapidity density （dN/dy） and the shape of the transverse momentum spectra are well reproduced by an earlier proposed Unified Statistical Thermal freeze-out Model （USTFM）, which incorporates the effects of both longitudinal as well as transverse hydrodynamic flow. The freeze-out properties in terms of kinetic freeze-out temperature and transverse flow velocity parameter are extracted from the model fits to the transverse momentum data provided by the ALICE experiment at the LHC. The kinetic freeze-out temperature is found to increase with decreasing event centrality while the transverse flow velocity parameter shows a mild decrease on moving towards peripheral collisions. Moreover the centrality dependence of the mid-rapidity system size at freeze-out has also been studied in terms of transverse radius parameter.

关键词： statistical model kinetic freeze-out chemical freeze-out collective flow

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