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Measurement of forward-backward multiplicity correlations in lead-lead, proton-lead, and proton-proton collisions with the ATLAS detector

机译:使用ATLAS探测器测量铅-铅,质子-铅和质子-质子碰撞中的向前-向后多重相关性

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摘要

Two-particle pseudorapidity correlations are measured in √sNN=2.76TeVPb+Pb, √sNN=5.02TeVp+Pb, and √s=13TeVpp collisions at the Large Hadron Collider (LHC), with total integrated luminosities of approximately 7μb−1, 28 nb−1, and 65 nb−1, respectively. The correlation function CN(η1,η2) is measured as a function of event multiplicity using charged particles in the pseudorapidity range |η|2.4. The correlation function contains a significant short-range component, which is estimated and subtracted. After removal of the short-range component, the shape of the correlation function is described approximately by 1+⟨a21⟩1/2η1η2 in all collision systems over the full multiplicity range. The values of ⟨a21⟩1/2 are consistent for the opposite-charge pairs and same-charge pairs, and for the three collision systems at similar multiplicity. The values of ⟨a21⟩1/2 and the magnitude of the short-range component both follow a power-law dependence on the event multiplicity. The short-range component in p + Pb collisions, after symmetrizing the proton and lead directions, is found to be smaller at a given η than in pp collisions with comparable multiplicity.
机译:在大强子对撞机(LHC)上,√sNN= 2.76TeVPb + Pb,√sNN= 5.02TeVp + Pb和√s= 13TeVpp碰撞中测量了两个粒子的假快速相关性,总积分光度约为7μb-1、28 nb-1和65 nb-1。使用伪快速范围|η| <2.4中的带电粒子,根据事件多重性测量相关函数CN(η1,η2)。相关函数包含一个重要的短程分量,可以对其进行估计和减去。除去短程分量后,在整个多重范围内的所有碰撞系统中,相关函数的形状大致由1 +⟨a21⟩1/2η1η2表示。 oppositea21⟩1/ 2的值对于相反电荷对和相同电荷对,以及三个具有相似多重性的碰撞系统都是一致的。 ⟩a21⟩1/ 2的值和短程分量的大小都遵循幂律对事件多重性的依赖。在对称质子和铅离子方向后,发现在p + Pb碰撞中,短程分量在给定的η下要比在pp碰撞中具有相近多重性的短程分量小。

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    The ATLAS Collaboration;

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  • 年度 2017
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  • 原文格式 PDF
  • 正文语种 eng
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