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arXiv 2112.09482nucl-exhep-ex
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$\sqrt{s_{\rm NN}}$ = 2.76TeV时Pb-$-$-Pb碰撞中中性到带电K介子产额的涨落

Neutral to charged kaon yield fluctuations in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76TeV

ALICE Collaboration

摘要:

我们提出的第一次测量事件的事件,事件的波动在K介子部门在铅铅碰撞在$\sqrt {s_{\rm NN}}=$ 2.76 TeV的ALICE探测器在大型强子对撞机。稳健的波动相关器$ν_{\rm dyn}$用于评估中性和带电K介子的相对产额的波动幅度,以及带电K介子的相对产额,作为碰撞中心性和选定的运动学范围的函数。虽然相关器$ν_{\rm dyn}[\rm K^+,\rm K^-]$呈现出近似与带电粒子多重性成反比的缩放,但$ν_{\rm dyn}[\rm K_S^0,\rm K^{\pm}]$具有与这种缩放的显著偏差。在不确定性范围内,$ν_{\rm dyn}[\rm K_S^0,\rm K^{\pm}]$的值与所选的横动量间隔无关,但它表现出赝快度依赖性。结果与HIJING,AMPT和EPOS-LHC预测进行了比较,并进一步讨论了在中心Pb-Pb碰撞中可能产生的无取向手性凝聚体的背景下。

英文摘要:

We present the first measurement of event-by-event fluctuations in the kaon sector in Pb-Pb collisions at $\sqrt {s_{\rm NN}}=$ 2.76 TeV with the ALICE detector at the LHC. The robust fluctuation correlator $ν_{\rm dyn}$ is used to evaluate the magnitude of fluctuations of the relative yields of neutral and charged kaons, as well as the relative yields of charged kaons, as a function of collision centrality and selected kinematic ranges. While the correlator $ν_{\rm dyn}[\rm K^+,\rm K^-]$ exhibits a scaling approximately in inverse proportion of the charged particle multiplicity, $ν_{\rm dyn}[\rm K_S^0,\rm K^{\pm}]$ features a significant deviation from such scaling. Within uncertainties, the value of $ν_{\rm dyn}[\rm K_S^0,\rm K^{\pm}]$ is independent of the selected transverse momentum interval, while it exhibits a pseudorapidity dependence. The results are compared with HIJING, AMPT and EPOS-LHC predictions, and are further discussed in the context of the possible production of disoriented chiral condensates in central Pb-Pb collisions.

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