Hadron Multiplicities in Pb＋Pb Collisions at the Large Hadron Collider and Pomeron Loop Effects  

作　　者：向文昌 王胜芹 周代翠 

机构地区：[1]Institute of Particle Physics, Huazhong Normal University, Wuhan 430079 [2]Physics Teaching Research Croup, Basic Course Teaching Department, Hunan Institute of Technology Hengyang 421002 [3]Department of Physics, The University of South Dakota, Vermillion, SD 57069, USA

出　　处：《Chinese Physics Letters》2010年第7期76-79,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10875051 and 10635020 （key project）, the Key Project of the Ministry of Education of China under Grant Nos 306022 and IRT0624, and the National Basic Research Program of China under Grant No 2008CB317106.

摘　　要：We study the pseudo-rapidity distribution of hadron multiplicities of high energy Pb＋Pb collisions by using color glass condensate dynamics at LHC/ALICE in the fixed coupling case. It is found that after including the pomeron loop effects the charged hadron multiplicities at central rapidity are about 1500 for central Pb＋Pb collisions, which are significantly smaller than the saturation based calculations, ～ 1700 ÷ 2500 and compatible with that based on a study of multiplicities in the fragmentation region.We study the pseudo-rapidity distribution of hadron multiplicities of high energy Pb＋Pb collisions by using color glass condensate dynamics at LHC/ALICE in the fixed coupling case. It is found that after including the pomeron loop effects the charged hadron multiplicities at central rapidity are about 1500 for central Pb＋Pb collisions, which are significantly smaller than the saturation based calculations, ～ 1700 ÷ 2500 and compatible with that based on a study of multiplicities in the fragmentation region.

分 类 号：O572.214[理学—粒子物理与原子核物理] O572.243[理学—物理]