Excitation Functions of Tsallis-Like Parameters in High-Energy Nucleus–Nucleus Collisions |
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| Authors: | Li-Li Li Fu-Hu Liu Khusniddin K Olimov |
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| Institution: | 1.State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China;2.Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China;3.Laboratory of High Energy Physics, Physical-Technical Institute of SPA “Physics-Sun” of Uzbek Academy of Sciences, Chingiz Aytmatov str. 2b, Tashkent 100084, Uzbekistan |
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| Abstract: | The transverse momentum spectra of charged pions, kaons, and protons produced at mid-rapidity in central nucleus–nucleus (AA) collisions at high energies are analyzed by considering particles to be created from two participant partons, which are assumed to be contributors from the collision system. Each participant (contributor) parton is assumed to contribute to the transverse momentum by a Tsallis-like function. The contributions of the two participant partons are regarded as the two components of transverse momentum of the identified particle. The experimental data measured in high-energy AA collisions by international collaborations are studied. The excitation functions of kinetic freeze-out temperature and transverse flow velocity are extracted. The two parameters increase quickly from ≈3 to ≈10 GeV (exactly from 2.7 to 7.7 GeV) and then slowly at above 10 GeV with the increase of collision energy. In particular, there is a plateau from near 10 GeV to 200 GeV in the excitation function of kinetic freeze-out temperature. |
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| Keywords: | excitation functions of related parameters participant parton kinetic freeze-out temperature transverse flow velocity |
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