论文标题
pb-pb碰撞中D-Meson Flow Harmonics的横向momentum和事件形状依赖性在$ \ sqrt {s_ {nn}} = 5.02 $ tev
Transverse-momentum and event-shape dependence of D-meson flow harmonics in Pb-Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV
论文作者
论文摘要
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在LHC上带有爱丽丝检测器。 D介子是通过横向动量间隔以$ 1 <p _ {\ rm t} <36 $ gev/$ c $在中心（0-10％）和半中央（30-50％）碰撞的二膜腐烂重建的。与尖质，质子和j/$ψ$介子相比，平均D-Meson $ v_ {n} $谐波在不确定性内与$ p _ {\ rm t} \ lyssim 3 $ gev/$ c $相似，并且与$ p p _} $ p _}的较高的p _ {c $相似。通过将事件形状工程（ESE）技术应用于D-Meson $ v_2 $和$ p _ {\ rm t} $ - 微分收益率，将魅力夸克与基础媒介中的夸克耦合到基础媒介。 D-Meson $ v_2 $与中央和半段落碰撞中的平均散装椭圆流有关。在当前的精度内，发现ESE选择和无偏样的样品中的每个事实D-Meson产量比与统一兼容。通过理论计算，所有测量值都可以很好地描述，包括魅力夸克传输的影响以及在流体动力学扩展培养基中带有光夸克的魅力夸克的重组。
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.
