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Centrality Dependence of Inclusive J/ψ Production in P-Pb Collisions at snn=5.02 TeV

Journal of High Energy Physics(2015)

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Abstract
We present a measurement of inclusive J/psi production in p-Pb collisions at root S-NN = 5.02 TeV as a function of the centrality of the collision, as estimated from the energy deposited in the Zero Degree Calorimeters. The measurement is performed with the ALICE detector down to zero transverse momentum, p(T), in the backward (-4.46 < y(cms) < -2.96) and forward (2.03 < y(cms) < 3.53) rapidity intervals in the dimuon decay channel and in the mid-rapidity region (-1.37 < y(cms) < 0.43) in the dielectron decay channel. The backward and forward rapidity intervals correspond to the Pb-going and p-going direction, respectively. The p(T)-differential J/psi production cross section at backward and forward rapidity is measured for several centrality classes, together with the corresponding average p(T) and p(T)(2) values. The nuclear modification factor is presented as a function of centrality for the three rapidity intervals, and as a function of p(T) for several centrality classes at backward and forward rapidity. At mid-and forward rapidity, the J/psi yield is suppressed up to 40% compared to that in pp interactions scaled by the number of binary collisions. The degree of suppression increases towards central p-Pb collisions at forward rapidity, and with decreasing p(T) of the J/psi. At backward rapidity, the nuclear modification factor is compatible with unity within the total uncertainties, with an increasing trend from peripheral to central p-Pb collisions.
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Quark gluon plasma,QCD,Heavy Ions
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要点】:该论文研究了在 ( \sqrt{s_{\mathrm{nn}}}=5.02 ) TeV 的 p-Pb 碰撞中,J/ψ 产生随碰撞中心性的依赖关系,揭示了不同中心性下 J/ψ 产额的抑制现象。

方法】:通过分析 ALICE 探测器在零横动量至全横动量范围内,以及不同快度区间(包括正负方向)的 J/ψ 产生情况,使用零度量热计估算碰撞中心性。

实验】:实验在 p-Pb 碰撞中使用 ALICE 探测器,通过测量 J/ψ 在不同快度区间的双电子和双μ子衰变通道的产额,以及不同中心性类别下的横动量分布,得到 J/ψ 的核修正因子,发现中快速度和前快速度区间的 J/ψ 产额相对于 pp 碰撞抑制了高达 40%,并且随着中心性的增加和 J/ψ 横动量的降低,抑制程度增强。在后快速度区间,核修正因子在总不确定度内与 unity 相兼容,并从边缘碰撞向中心碰撞呈现增加趋势。数据集为 p-Pb 碰撞实验数据。