D Meson Elliptic Flow in Noncentral Pb-Pb Collisions at √SNN=2.76 TeV
D Meson Elliptic Flow in Noncentral Pb-Pb Collisions at √SNN=2.76 TeV
复制标题
DOI：
10.1103/physrevlett.111.102301
复制
发表时间：
2013-09-05
影响因子：
8.6
通讯作者：
Zyzak, M.
中科院分区：
文献类型：
--
作者：
Abelev, B.;Adam, J.;Zyzak, M.
在LHC上用ALICE探测器研究了核-核子碰撞质心能量根（S）（NN）= 2.76TeV的Pb-Pb碰撞中，D-0，D+和D*+介子在中心快度区（垂直棒y垂直棒< 0.8）的方位各向异性分布.第二傅立叶系数uppermost（2）（通常表示为椭圆流）在中心度类30%-50%中作为D介子横向动量p（T）的函数在2-16 GeV/c范围内测量。测量到的D介子的上升幅度（2）与轻味强子的上升幅度相当。在2 < p（T）< 6 GeV/c的范围内，它是正的，具有5.7 sigma的显著性，基于统计和系统不确定性的组合。
Azimuthally anisotropic distributions of D-0, D+, and D*+ mesons were studied in the central rapidity region (vertical bar y vertical bar < 0.8) in Pb-Pb collisions at a center-of-mass energy root(S)(NN) = 2.76 TeV per nucleon-nucleon collision, with the ALICE detector at the LHC. The second Fourier coefficient upsilon(2) (commonly denoted elliptic flow) was measured in the centrality class 30%-50% as a function of the D meson transverse momentum p(T), in the range 2-16 GeV/c. The measured upsilon(2) of D mesons is comparable in magnitude to that of light-flavor hadrons. It is positive in the range 2 < p(T) < 6 GeV/c with 5.7 sigma significance, based on the combination of statistical and systematic uncertainties.