A Study of Transverse Momentum Distributions of Jets Produced inp-p,p-p-,d-Au, Au-Au, and Pb-Pb Collisions at High Energies

Hua-Rong Wei,Fu-Hu Liu

doi:10.1155/2015/263135

Abstract

The transverse momentum distributions of jets produced inp-p,p-p-,d-Au, Au-Au, and Pb-Pb collisions at high energies with different selected conditions are analyzed by using a multisource thermal model. The multicomponent (mostly two-component) Erlang distribution used in our description is in good agreement with the experimental data measured by the STAR, D0, CDF II, ALICE, ATLAS, and CMS Collaborations. Related parameters are extracted from the transverse momentum distributions and some information on different interacting systems is obtained. In the two-component Erlang distribution, the first component has usually two or more sources which are contributed by strong scattering interactions between two quarks or more quarks and gluons, while the second component has mostly two sources which are contributed by harder head-on scattering between two quarks.

Highlights

As a new state of matter, quark-gluon plasma (QGP) [1] is different from common plasmas
A high density and high temperature location is formed at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) to create the QGP and to produce multiple final-state particles
The transverse momentum distribution generated in thermodynamic system obeys an exponential distribution, which is the contribution of one emission source

Summary

Introduction

As a new state of matter, quark-gluon plasma (QGP) [1] is different from common plasmas. In order to study the properties of the QGP and the mechanisms of parton interactions, a lot of experiments of high energy heavy ion collisions have been performed. A high density and high temperature location is formed at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) to create the QGP and to produce multiple final-state particles. To analyze high-pT spectra of final-state particles is important in studying the mechanisms of high energy collisions. The mean transverse momentum of particles, which served as a probe for the equation of state of the hadronic matter [7], can partly reflect the effective temperature of interacting system and the transverse excitation degree of emission source in high energy collisions [8]. The calculations are performed by using the Monte Carlo method

The Model and Formulism

Comparison with Experimental Data

Conclusions