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Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India.
Phys Rev Lett. 2023 Jul 28;131(4):041901. doi: 10.1103/PhysRevLett.131.041901.
The first measurement of event-by-event antideuteron number fluctuations in high energy heavy-ion collisions is presented. The measurements are carried out at midrapidity (|η|<0.8) as a function of collision centrality in Pb-Pb collisions at sqrt[s_{NN}]=5.02 TeV using the ALICE detector. A significant negative correlation between the produced antiprotons and antideuterons is observed in all collision centralities. The results are compared with a state-of-the-art coalescence calculation. While it describes the ratio of higher order cumulants of the antideuteron multiplicity distribution, it fails to describe quantitatively the magnitude of the correlation between antiproton and antideuteron production. On the other hand, thermal-statistical model calculations describe all the measured observables within uncertainties only for correlation volumes that are different with respect to those describing proton yields and a similar measurement of net-proton number fluctuations.
首次给出了高能重离子碰撞中逐事件反氘核数涨落的测量结果。使用ALICE探测器，在质心能量(\sqrt{s_{NN}} = 5.02) TeV的铅-铅碰撞中，在中快度（(\vert\eta\vert\lt0.8)）下作为碰撞中心度的函数进行了测量。在所有碰撞中心度下，均观察到产生的反质子与反氘核之间存在显著的负相关。将结果与最新的聚结计算进行了比较。虽然它描述了反氘核多重性分布的高阶累积量之比，但未能定量描述反质子与反氘核产生之间相关性的大小。另一方面，热统计模型计算仅在不确定性范围内描述了所有测量的可观测量，前提是相关体积与描述质子产率和净质子数涨落类似测量的相关体积不同。
