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arXiv 2511.00567nucl-exhep-ex
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利用 ALICE 在 Pb-Pb 碰撞中通过粲强子椭圆流研究 QGP 中的粲夸克动力学

Investigating charm-quark dynamics in the QGP via the charm-hadron elliptic flow in Pb-Pb collisions with ALICE

Marcello Di Costanzo

AI总结:

本文利用 ALICE 在 LHC Run 3 的 Pb-Pb 碰撞数据,首次测量了瞬发和非瞬发粲强子的椭圆流,揭示了粲能区重子与介子流的分裂现象,为 QGP 中的夸克动力学提供了新见解。

摘要:

在这些会议录中,展示了利用 ALICE 探测器在 LHC Run 3 期间收集的最新数据,在 $\sqrt{s_{\mathrm{NN}}} = 5.36~\text{TeV}$ 的 Pb-Pb 碰撞中,对瞬发和非瞬发粲强子(分别源自粲夸克碎裂和含美夸克强子衰变)的椭圆流($v_{2}$)测量。分析在中心快度($|y| < 0.8$)下进行,使用强子衰变道重建信号候选者。$v_{2}$ 系数通过标量积(SP)技术测量。报告了半中心碰撞中 $D^{0}$、$D^{+}$、$D_{s}^{+}$ 介子以及首次对 $Λ_{c}^{+}$ 重子的瞬发 $v_{2}$。这些结果对 D 介子实现了前所未有的精度和低 $p_{\mathrm{T}}$ 覆盖范围,并突显了在中间 $p_{\mathrm{T}}$ 下粲能区重子与介子椭圆流分裂的首次观测。还在边缘碰撞中测量了瞬发 $D^{0}$、$D^{+}$ 和 $D_{s}^{+}$ 的 $v_{2}$,为超相对论重离子碰撞中产生的火球特征提供了新见解。正如预期的那样,由于美夸克质量较大,在半中心碰撞中观察到非瞬发 $D^{0}$ 和 $Λ_{c}^{+}$ 强子具有较低的 $v_{2}$ 值。

英文摘要:

In these proceedings, the elliptic flow ($v_{2}$) measurement of prompt and non-prompt charm hadrons - originating respectively from the fragmentation of a charm quark and from the decay of hadrons with beauty-quark content - in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.36~\text{TeV}$, using the latest data collected during LHC Run 3 by the ALICE detector, is presented. The analysis is performed at midrapidity ($|y| < 0.8$), and hadronic decay channels are used to reconstruct the signal candidates. The $v_{2}$ coefficient is measured via the Scalar Product (SP) technique. The prompt $v_{2}$ in semicentral collisions is reported for the $D^{0}$, $D^{+}$, $D_{s}^{+}$ mesons and, for the first time, for the $Λ_{c}^{+}$ baryon. These results achieve unprecedented precision and low-$p_{\mathrm{T}}$ reach for the D mesons and highlight the first observation of the splitting of baryon and meson elliptic flow at intermediate $p_{\mathrm{T}}$ in the charm sector. The $v_{2}$ is also measured for prompt $D^{0}$, $D^{+}$ and $D_{s}^{+}$ in peripheral collisions, offering new insights into the features of the fireball generated in ultrarelativistic heavy-ion collisions. Lower $v_{2}$ values are observed for non-prompt $D^{0}$ and $Λ_{c}^{+}$ hadrons in semicentral collisions, as expected from the larger beauty-quark mass.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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