Forward-backward multiplicity correlations in pp, p + Pb and Pb + Pb collisions with the ATLAS detector

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• 作者：Jiangyong Jia^a ; ^b ; ¹ ; on behalf of the ATLAS Collaboration
• 关键词：heavy ion ; pseudorapidity correlation ; short-range correlation ; long-range correlation
• 刊名：Nuclear Physics A
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：956
• 期：Complete
• 页码：405-408
• 全文大小：510 K

文摘

Two-particle pseudorapidity correlations are measured in $\sqrt{s_{\mathrm{NN}}}=2.76\text{TeV}$ Pb+Pb, $\sqrt{s_{\mathrm{NN}}}=5.02\text{TeV}$p  +Pb and $\sqrt{s}=13\text{TeV}$pp   collisions [ATLAS Collaboration, ATLAS-CONF-2015-051; ATLAS-CONF-2015-020]. Correlation function is measured using charged particles in the pseudorapidity range |η|<2.4$|\eta |<2.4$ with transverse momentum p_T>0.2 GeV$p_{\mathrm{T}}>0.2\text{GeV}$, and it is measured as a function of event multiplicity, defined by number of charged particles with |η|<2.5$|\eta |<2.5$ and p_T>0.4 GeV$p_{\mathrm{T}}>0.4\text{GeV}$. The correlation function is decomposed into a short-range component (SRC) and a long-range component (LRC). The SRC differs significantly between the opposite-charge pairs and same-charge pairs, and between the three collision systems at similar multiplicity. The LRC is described approximately by $1+〈a_1^2〉{\eta }_1{\eta }_2$ in all collision systems over the full multiplicity range. The values of $〈a_1^2〉$ are consistent between the opposite-charge and same-charge pairs, and are similar for the three collision systems at similar multiplicity. The values of $〈a_1^2〉$ and the magnitude of the SRC both follow a power-law dependence on the event multiplicity.