Tsallis Statistical Interpretation of Transverse Momentum Spectra in High-EnergypA Collisions

Bao-Chun Li,Fu-Hu Liu,Guo-Xing Zhang,Jun-Hui Kang,Zhao Zhang

doi:10.1155/2015/741816

Abstract

In Tsallis statistics, we investigate charged pion and proton production forpCu andpPb interactions at 3, 8, and 15 GeV/c. Two versions of Tsallis distribution are implemented in a multisource thermal model. A comparison with experimental data of the HARP-CDP group shows that they both can reproduce the transverse momentum spectra, but the improved form gives a better description. It is also found that the difference betweenqandq′is small when the temperatureT = T′for the same incident momentum and angular interval, and the value ofqis greater thanq′in most cases.

Highlights

Heavy ion collisions at Large Hadron Collider (LHC) are essential for the investigation of strongly interacting matter at high-energy density [1]
We combine the picture of the multisource thermal model and Tsallis statistics to investigate the transverse momentum spectra of protons and charged pions produced in the collisions of 3, 8, and 15 GeV/c protons on Cu and Pb at fixed angles of 30∘–40∘, 60∘–75∘, and 105∘–125∘
Equation (4) has been improved from (5) to satisfy the thermodynamic consistency [12, 13]. By comparing their results to the hadron production (HARP)-CDP data, it is found that they both agree with the experimental data and (4) can better reproduce the transverse momentum spectra

Summary

Introduction

Heavy ion collisions at Large Hadron Collider (LHC) are essential for the investigation of strongly interacting matter at high-energy density [1]. Many models have been proposed in the interpretation of the pT spectra in high-energy collisions, such as multisource thermal model [3,4,5], diffusion model [6], and Tsallis statistics [7,8,9,10,11]. In our previous work [14], we have consistently embedded the improved form of the Tsallis distribution into a multisource thermal model to describe systematically pseudorapidity distributions in pp (pp), AuAu, CuCu, and PbPb collisions at RHIC and LHC energies.

Tsallis Statistics Description of the Transverse Momentum Spectra

Discussions and Conclusions