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arXiv 1602.01119nucl-exhep-ex
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$\sqrt{s_{\rm NN}}=5.02$ TeV上Pb-Pb碰撞中带电粒子的各向异性流动

Anisotropic flow of charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

ALICE Collaboration

备注：
16 pages, 3 captioned figures, authors from page 11, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/2282
发表信息：
Phys. Rev. Lett. 116 (2016) 132302
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摘要：

本文报道了在欧洲核子研究中心（CERN）大型强子对撞机上，利用ALICE探测器，在$\sqrt{s_{\rm NN}}=5.02$ TeV的Pb-Pb碰撞中首次获得的椭圆形（$v_2$）、三角形（$v_3$）和四边形（$v_4$）带电粒子流的结果。在中心赝快度区$|η|<0.8$和横向动量范围$0.2<p_{\rm T}<5$ GeV/ $c$进行测量。各向异性流测量使用两个粒子的相关性与赝快度间隙大于一个单位，并与多粒子累积量方法。与$\sqrt{s_{\rm NN}}=2.76$ TeV的Pb-Pb碰撞结果相比，在0- 50%的中心度范围内，各向异性流动系数$v_{2}$、$v_{3}$和$v_{4}$分别增加了（$3.0\pm0.6$）%、（$4.3\pm1.4$）%和（$10.2\pm3.8$）%.这种增加可以主要归因于两种能量之间的平均横向动量的增加。的测量结果被认为是兼容的流体动力学模型计算。这种比较提供了一个独特的机会来测试的有效性的流体动力学图片和功率，以进一步区分各种可能性的剪切粘度的温度依赖性的熵密度比的产生的物质在重离子碰撞在最高的能量。

英文摘要：

We report the first results of elliptic ($v_2$), triangular ($v_3$) and quadrangular flow ($v_4$) of charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV with the ALICE detector at the CERN Large Hadron Collider. The measurements are performed in the central pseudorapidity region $|η|<0.8$ and for the transverse momentum range $0.2<p_{\rm T}<5$ GeV/$c$. The anisotropic flow is measured using two-particle correlations with a pseudorapidity gap greater than one unit and with the multi-particle cumulant method. Compared to results from Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV, the anisotropic flow coefficients $v_{2}$, $v_{3}$ and $v_{4}$ are found to increase by ($3.0\pm0.6$)%, ($4.3\pm1.4$)% and ($10.2\pm3.8$)%, respectively, in the centrality range 0-50%. This increase can be attributed mostly to an increase of the average transverse momentum between the two energies. The measurements are found to be compatible with hydrodynamic model calculations. This comparison provides a unique opportunity to test the validity of the hydrodynamic picture and the power to further discriminate between various possibilities for the temperature dependence of shear viscosity to entropy density ratio of the produced matter in heavy-ion collisions at the highest energies.

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