Dependence of related parameters on centrality and mass in a new treatment for transverse momentum spectra in high energy collisions

preprint2021arXivOpen access

Abstract

We collected the experimental data of transverse momentum spectra of identified particles produced in proton-proton (pp-pp), deuteron-gold (dd-Au or dd-AA), gold-gold (Au-Au or AA-AA), proton-lead (pp-Pb or pp-AA), and lead-lead (Pb-Pb or AA-AA) collisions measured by the ALICE, CMS, LHCb, NA49, NA61/SHINE, PHENIX, and STAR collaborations at different center-of mass energies. The multisource thermal model at the quark level or the participant quark model is used to describe the experimental data. The free parameters, the effective temperature TT, entropy index-related nn, and revised index a0a_{0}, in the revised Tsallis--Pareto-type function are extracted at the quark level. In most cases, TT and nn in central collisions are larger than those in peripheral collisions, and a0a_0 does not change in different centrality classes. With the increase in the mass of produced particle or participant quark, TT and a0a_0 increase, and nn does not change significantly. The behaviors of related parameters from pp-pp, p(d)p(d)-AA, and AA-AA collisions are similar.

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