AI 中文总结
ALICE实验在LHC Run 3中测量不同碰撞系统的直接粲强子椭圆流，首次观测到粲 sector 中间p_T区重子与介子椭圆流劈裂，揭示粲夸克在QGP中的热平衡程度。
AI 中文摘要
本文介绍了ALICE探测器在LHC Run 3期间采集的质心系能量√s_NN=5.36 TeV的铅-铅（Pb-Pb）和氧-氧（OO）碰撞中直接产生粲强子的椭圆流（v₂）测量结果。分析在快度中心区（|y|<0.8）进行，采用强子衰变道重建信号候选粒子，通过标量积（SP）技术测量v₂系数。报告了半中心Pb-Pb碰撞中直接产生的D⁰、D⁺、Dₛ⁺介子和Λ_c⁺重子的v₂，这些结果达到了前所未有的精度和低横动量（p_T）探测范围，首次在粲夸克领域观测到中间横动量区重子与介子椭圆流的劈裂。还测量了外围Pb-Pb碰撞和中心OO碰撞中直接产生的D介子v₂，探究了粲夸克在逐渐缩小的夸克-胶子等离子体介质中传播达到的热平衡程度。
英文摘要
In these proceedings, the elliptic flow ($v_2$) measurement of prompt charm hadrons in lead-lead (Pb-Pb) and oxygen-oxygen (OO) collisions at $\sqrt{s_{\mathrm{NN}}} = 5.36$ TeV, using the 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 $v_2$ of prompt D$^0$, D$^+$, D$_\text{s}^+$ mesons, and $Λ_{\text{c}}^+$ baryons in semicentral Pb-Pb collisions is reported. These results achieve unprecedented precision and low-$p_{\text{T}}$ reach for the D mesons and highlight the first observation of the splitting of baryon and meson elliptic flow at intermediate $p_{\text{T}}$ in the charm sector. The prompt D-meson $v_2$ is also measured in peripheral Pb-Pb collisions and central OO collisions, probing the degree of thermal equilibration reached by charm quarks propagating in progressively smaller quark-gluon plasma media.
Comments4 pages, 2 figures; Proceedings of the 2026 Strangeness in Quark Matter Conference (22/3/2026-27/3/2026), SQM2026, Los Angeles, California
