在大型强子对撞机的ALICE中测量已识别粒子的波动

A. Ohlson
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引用次数: 3

摘要

在超相对论性核-核碰撞中确定的粒子的事件波动提供了在这些碰撞中产生的物质状态的信息,以及核物质的相图。在这篇论文中,我们介绍了ALICE关于净质子涨落的中心性和赝快依赖性的最新结果,它们与净重子涨落以及净介子和净介子涨落密切相关。讨论了体积波动和整体重子守恒对这些观测值的影响。此外,由可观测值$\nu_{dyn}$量化的不同粒子种之间的相关波动也被表示为多重性和碰撞能量的函数,并与蒙特卡罗模型进行了比较。这些测量是在$\sqrt{s_{\mathrm{NN}}} = 2.76$ TeV的Pb-Pb碰撞中使用新颖的同一性方法进行的,并利用了ALICE出色的粒子识别能力。
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Measurements of the fluctuations of identified particles in ALICE at the LHC
The event-by-event fluctuations of identified particles in ultrarelativistic nucleus-nucleus collisions give information about the state of matter created in these collisions as well as the phase diagram of nuclear matter. In this proceedings, we present the latest results from ALICE on the centrality and pseudorapidity dependence of net-proton fluctuations, which are closely related to net-baryon fluctuations, as well as net-kaon and net-pion fluctuations. The effects of volume fluctuations and global baryon conservation on these observables are discussed. Furthermore, the correlated fluctuations between different particle species, quantified by the observable $\nu_{dyn}$, are also shown as functions of multiplicity and collision energy and are compared with Monte Carlo models. These measurements are performed in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 2.76$ TeV using the novel Identity Method and take advantage of the excellent particle identification capabilities of ALICE.
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