Comparison of the Color Glass Condensate to multiplicity dependence of the average transverse momentum in p plus p, p plus Pb and Pb plus Pb collisions at the LHC

被引：18

作者：

Rezaeian, Amir H. ^{[1
,2
]}

机构：

[1] Univ Tecn Federico Santa Maria, Dept Fis, Ctr Estudios Subatom, Valparaiso, Chile

[2] Ctr Cient Tecnol Valparaiso, Valparaiso, Chile

来源：

PHYSICS LETTERS B | 2013年 / 727卷 / 1-3期

关键词：

GLUON DISTRIBUTION-FUNCTIONS; LONG-RANGE; ANGULAR-CORRELATIONS; HADRON-PRODUCTION; QCD; SIDE; SATURATION; PROTONS;

D O I：

10.1016/j.physletb.2013.10.038

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The first moment < p(T)> of the charged-particle transverse momentum spectrum and its correlation with the charged-particle multiplicity No provide vital information about the underlying particle production mechanism. The ALICE Collaboration recently reported that < p(T)> versus N-ch in Pb+Pb collisions is smaller than in p+p and p+Pb collisions. Other interesting features of data is rather flatness of < p(T)> at high N-ch in Pb+Pb and p+Pb collisions in seemingly striking contrast to the case of p+p collisions. With a detailed calculation, we show all these peculiar features in a wide range of energies and system sizes can be well described by the idea of gluon saturation within the Color Glass Condensate framework using the k(T)-factorization. This establishes an important fact that the bulk of the produced particles in heavy-ion collisions at the LHC carries signature of the initial stage of collisions. We also show that the recent scaling property seen by the CMS Collaboration between the number of tracks in p+p and p+Pb collisions may provide a strong evidence in fayor of geometric-scaling phenomenon and gluon saturation, indicating that the underlying dynamics of high multiplicity events in p+p and p+Pb collisions should be similar. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：218 / 225

页数：8

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