Elliptic Flow of Charged Particles in Pb-Pb Collisions at √sNN=2.76 TeV
Elliptic Flow of Charged Particles in Pb-Pb Collisions at √sNN=2.76 TeV
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DOI：
10.1103/physrevlett.105.252302
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发表时间：
2010-12-13
影响因子：
8.6
通讯作者：
Zynovyev, M.
中科院分区：
文献类型：
--
作者：
Aamodt, K.;Abelev, B.;Zynovyev, M.
我们报告的第一个测量的带电粒子椭圆流在铅铅碰撞在根s（NN）p = 2.76 TeV的ALICE探测器在欧洲核子研究中心的大型强子对撞机。测量是在中心赝快度区域（竖线eta < 0.8）和横向动量范围0.2 < p（t）< 5.0 GeV/c内进行的。在40%-50%中心度类中，用4粒子相关方法测量的椭圆流信号v（2），在横动量和赝快度上的平均值为0.087 +/- 0.002（stat）+/- 0.003（syst）。微分椭圆流v（2）（p（t））在p（t）= 3GeV/c附近达到最大值0.2。与根s（NN）= 200 GeV的RHIC Au-Au碰撞相比，椭圆流增加了约30%。一些流体动力学模型的预测，其中包括粘性修正与观察到的增加。
We report the first measurement of charged particle elliptic flow in Pb-Pb collisions at root s(NN) p = 2.76 TeV with the ALICE detector at the CERN Large Hadron Collider. The measurement is performed in the central pseudorapidity region (vertical bar eta vertical bar < 0.8) and transverse momentum range 0.2 < p(t) < 5.0 GeV/c. The elliptic flow signal v(2), measured using the 4-particle correlation method, averaged over transverse momentum and pseudorapidity is 0.087 +/- 0.002(stat) +/- 0.003(syst) in the 40%-50% centrality class. The differential elliptic flow v(2)(p(t)) reaches a maximum of 0.2 near p(t) = 3 GeV/c. Compared to RHIC Au-Au collisions at root s(NN) = 200 GeV, the elliptic flow increases by about 30%. Some hydrodynamic model predictions which include viscous corrections are in agreement with the observed increase.