https://doi.org/10.1140/epja/i2019-12903-3
Regular Article - Theoretical Physics
Centrality and transverse momentum dependencies of hadrons in Pb+Pb collisions at 
TeV and Xe+Xe collisions at 
TeV from a multi-phase transport model
1
Department of Physics, Sichuan University, 610064, Chengdu, China
2
School of Physics and Information Technology, Shaanxi Normal University, 710119, Xi’an, China
3
Chengdu Experimental Foreign Languages School, 610064, Chengdu, China
* e-mail: zhengh@snnu.edu.cn
Received:
28
April
2019
Accepted:
30
September
2019
Published online:
15
November
2019
In this paper, we study and predict the charged-particle pseudorapidity multiplicity density (
), transverse momentum spectra of identified particles and their ratios in relativistic heavy ion collisions at the Large Hadron Collider (LHC), using the string-melting version of a multi-phase transport (AMPT) model with an improved quark coalescence method. We extend this improved AMPT model to the energy region available in the experiment and test its validity, in particular, by predicting the experimental observables. Results of the charged-particle pseudorapidity multiplicity density from AMPT model calculations for Pb+Pb collisions at 
TeV are compared with the experimental data. Good agreements are generally found between the theoretical calculations and experimental data. But for Xe+Xe collisions at 
TeV, the are systematically overestimated by 20% at different centralities with the same model parameters. We predict the 
spectra of charged pions, kaons and protons as well as their ratios 
and 
at midrapidity (
) in both Pb+Pb collisions at TeV and Xe+Xe collisions at TeV that are measured at LHC. The spectra of identified particles in Pb+Pb collisions from the improved AMPT model are compared and found to be consistent with results from the iEBE-VISHNU hybrid model with TRENTo initial condition.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2019
