arXiv 2005.111312020-05nucl-exhep-ex

$\sqrt{s_{NN}} = 5.02$ TeV上Pb-Pb碰撞中D介子流谐波的横动量和事件形状依赖性

Transverse-momentum and event-shape dependence of D-meson flow harmonics in Pb-Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV

ALICE Collaboration

备注：: 28 pages, 6 captioned figures, 2 tables, authors from page 23, published version, figures at http://alice-publications.web.cern.ch/node/6222
发表信息：: Phys. Lett. B 813 (2021) 136054
DOI：: 10.1016/j.physletb.2020.136054

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摘要：

在LHC上用ALICE探测器测量了在中快度（$|y|<0.8$）下，在每个核子对质量中心能量为$\sqrt{s_{NN}} = 5.02$ TeV的Pb-Pb碰撞中，瞬发D $^{0}$、D $^{+}$和D $^{*+}$介子的椭圆流系数$v_2$和三角流系数$v_3$.在中心碰撞（0-10%）和半中心碰撞（30-50%）中，D介子在横动量间隔$1< p_{\rm T}<36$ GeV/ $c$内通过强子衰变重建。与π介子、质子和J/ $ψ$介子相比，平均D介子$v_{n}$谐波在不确定度范围内与$p_{\rm T} \lesssim 3$ GeV/ $c$的质量等级相容，并且与更高$p_{\rm T}$的带电π介子的质量等级相似。将事件形状工程（ESE）技术应用于D介子$v_2$和$p_{\rm T}$ -微分产额，进一步研究了下伏介质中粲夸克与轻夸克的耦合.在中心和半中心碰撞中，D介子$v_2$与平均体椭圆流相关。在目前的精度范围内，每个事件的D-介子产额的比例在ESE选择和无偏的样品被发现是兼容的统一。所有的测量被发现是合理的，以及描述的理论计算，包括魅力夸克输运和重组的魅力夸克与轻夸克在流体动力学膨胀介质的影响。

英文摘要：

The elliptic and triangular flow coefficients $v_2$ and $v_3$ of prompt D$^{0}$, D$^{+}$, and D$^{*+}$ mesons were measured at midrapidity ($|y|<0.8$) in Pb-Pb collisions at the centre-of-mass energy per nucleon pair of $\sqrt{s_{NN}} = 5.02$ TeV with the ALICE detector at the LHC. The D mesons were reconstructed via their hadronic decays in the transverse momentum interval $1< p_{\rm T}<36$ GeV/$c$ in central (0-10%) and semi-central (30-50%) collisions. Compared to pions, protons, and J/$ψ$ mesons, the average D-meson $v_{n}$ harmonics are compatible within uncertainties with a mass hierarchy for $p_{\rm T} \lesssim 3$ GeV/$c$, and are similar to those of charged pions for higher $p_{\rm T}$. The coupling of the charm quark to the light quarks in the underlying medium is further investigated with the application of the event-shape engineering (ESE) technique to the D-meson $v_2$ and $p_{\rm T}$-differential yields. The D-meson $v_2$ is correlated with average bulk elliptic flow in both central and semi-central collisions. Within the current precision, the ratios of per-event D-meson yields in the ESE-selected and unbiased samples are found to be compatible with unity. All the measurements are found to be reasonably well described by theoretical calculations including the effects of charm-quark transport and the recombination of charm quarks with light quarks in a hydrodynamically expanding medium.

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