Dependence of Charged Particle Pseudorapidity Distributions on Centrality in Pb-Pb Collisions at √SNN =2.76 TeV

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2013,（2）
• 页码范围: 61-64
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/30/2/022501

摘要

In November 2010,the CERN Large Hadron Collider (LHC) located in Geneva,Switzerland firstly carried out an experiment on Pb-Pb collisions.[1-6] In the experiment,the center-of-mass energy per nucleon pair (√SNN) of the two Pb ions reached 2.76 TeV.This energy has been entering an epoch in the collisions of heavy ions,which is approximately 14 times the highest energy previously obtained in the heavy ion experiment performed in the laboratory.An environment of high temperature and high density is formed in such high-energy collisions.Under such extreme conditions,the relativistic heavy ion experiment operated by the LHC mainly aims at understanding the material attribution of nucleus or hadron and probing the quark-gluon plasma formed in such collisions.Quark-gluon plasma is also called deconfined matter which can free motion in extended space while the quarks and gluons have escaped from the restriction of nucleus.[7-9] In usual situations,the nucleus is made through strong interaction between quarks,and the gluon is the basic particle which conveys the strong interaction.Quantum chromodynamics predicts that at a high temperature and a high density a deconfined phase from hadronic matter to quark-gluon plasma will occur.[10-12] The heavy ion experiments operated at the LHC have created opportunities for studying the strong interaction under the conditions of high temperature and high density.