Hadron Multiplicity in Pb+Pb Collisions at √s=2.76 TeV from Color Glass Condensate
XIANG Wen-Chang1,2**, ZHANG Jun-Jie1, ZHOU Dai-Cui2, CHEN Shi-Guo1, LIU Wan-Song1
1College of Physics and Electronics Science, Guizhou Normal University, Guiyang 550001 2Institute of Particle Physics, Huazhong Normal University, Wuhan 430079
Abstract：The pseudo-rapidity distribution of charged hadron multiplicity in Pb+Pb collisions at √s=2.76 TeV is studied by using Color Glass Condensate dynamics in the fixed coupling case. We fit the HERA experimental data with heavy parton mass effect to obtain saturation exponent λ=0.22. It is found that the charged hadron multiplicity can only describe after including heavy parton mass effect due to a large amount of heavy partons produced at large hadron collider (LHC) energy. The pomeron loop effect contribution to hadron production is also investigated. It shows that charged hadron multiplicity is underestimated by including the pomeron loop effect, which indicates that the pomeron loop effect may not exist at LHC energy.
(Relativistic heavy-ion collisions (collisions induced by light ions studied to calibrate relativistic heavy-ion collisions should be classified under both 25.75.-q and sections 13 or 25 appropriate to the light ions))
2013, Vol. 30 
