Two-gluon rapidity correlations of strong colour field in pp, pA and AA collisions

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• 作者：Ye-Yin Zhao ^{yeyin.zhao@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Ming-Mei Xu ; Heng-Ying Zhang ; Yuan-Fang Wu ; ^{wuyf@mail.ccnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Gluon saturation ; Rapidity correlations ; Glasma
• 刊名：Nuclear Physics A
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：955
• 期：Complete
• 页码：88-100
• 全文大小：775 K

文摘

Using the CGC formalism, we calculate the two-gluon rapidity correlations of strong colour fields in pp, pA and AA collisions, respectively. If one trigger gluon is fixed at central rapidity, a ridge-like correlation pattern is obtained in symmetry pp and AA collisions, and a huge bump-like correlation pattern is presented in asymmetry pA collisions. It is demonstrated that long-range ridge-like rapidity correlations are caused by the stronger correlation with the gluon of colour source. These features are independent of the azimuthal angular of two selected gluon. They are qualitatively consistent with current observed data at LHC. The transverse momentum and incident energy dependence of the ridge and bump-like correlations are also systematically studied. The ridge is more likely observed at higher incident energy and lower transverse momentum of trigger gluon.