Measurement of D0 Azimuthal Anisotropy at Midrapidity in Au plus Au Collisions at √SNN=200 GeV
Measurement of D0 Azimuthal Anisotropy at Midrapidity in Au plus Au Collisions at √SNN=200 GeV
复制标题
sqrt{s_{NN}}=200 GeV 下 Au Au 碰撞中 D0 中速方位各向异性的测量
DOI：
10.1103/physrevlett.118.212301
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发表时间：
2017-05-26
影响因子：
8.6
通讯作者：
Zyzak, M.
中科院分区：
文献类型：
--
作者：
Adamczyk, L.;Adkins, J. K.;Zyzak, M.
本文报道了在根S-NN = 200 GeV的Au + Au碰撞中，在中快度（破垂直条y破垂直条< 1）下首次测量到的粲介子D-0的椭圆各向异性（v（2））.测量是由RHIC的星星实验利用一种新的高分辨率硅跟踪器进行的。在横向动量p（T）小于4GeV/c的情况下，测量的0%-80%中心度Au + Au碰撞的D-0 v（2）可以用粘性流体动力学计算来描述。D-0 v（2）随横向动能（m（T）- m（0），其中m（T）= root p（T）（2）+ m（0）（2）p）的变化与10%- 40%中心度Au + Au碰撞中轻介子的结果一致.这些结果表明，粲夸克已经实现了与这种碰撞中产生的介质的局部热平衡。几个理论模型，其与温度有关的无量纲粲空间扩散系数（2 π TD）在2-12的范围内，能够同时重现我们的D-0 v（2）结果和我们以前发表的D-0核修改因子的结果。
We report the first measurement of the elliptic anisotropy (v(2)) of the charm meson D-0 at midrapidity (broken vertical bar y broken vertical bar < 1) in Au + Au collisions at root S-NN = 200 GeV. The measurement was conducted by the STAR experiment at RHIC utilizing a new high- resolution silicon tracker. The measured D-0 v(2) in 0%-80% centrality Au + Au collisions can be described by a viscous hydrodynamic calculation for a transverse momentum (p(T)) of less than 4 GeV/c. The D-0 v(2) as a function of transverse kinetic energy (m(T) - m(0), where m(T) = root p(T)(2) + m(0)(2) p) is consistent with that of light mesons in 10%- 40% centrality Au + Au collisions. These results suggest that charm quarks have achieved local thermal equilibrium with the medium created in such collisions. Several theoretical models, with the temperature-dependent, dimensionless charm spatial diffusion coefficient (2 pi TDs) in the range of similar to 2-12, are able to simultaneously reproduce our D-0 v(2) result and our previously published results for the D-0 nuclear modification factor.