Pion transverse-momentum spectrum, elliptic flow, and Hanbury-Brown-Twiss interferometry in a viscous granular source model

Pion transverse-momentum spectrum, elliptic flow, and Hanbury-Brown-Twiss interferometry in a viscous granular source model
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粘性颗粒源模型中的π介子横向动量谱、椭圆流和 Hanbury-Brown-Twiss 干涉测量

DOI:
10.1088/1674-1137/41/8/084102
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发表时间:
2016-08
期刊:
影响因子:
3.6
通讯作者:
Yan-Yu Ren
Yan-Yu Ren
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Jing Yang;Wei-Ning Zhang;Yan-Yu Ren

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我们利用粘性流体动力学研究了夸克-胶子等离子体 (QGP) 液滴的演化,并分析了由粘性 QGP 液滴组成的颗粒源模型中的π介子横向动量谱、椭圆流和 Hanbury-Brown-Twiss (HBT) 干涉测量。 QGP 液滴的剪切粘度分别加速和减慢液滴中心和外围区域的液滴演化。体积粘度对演化的影响可以忽略不计。尽管对液滴演化存在粘性影响,但对于有或没有粘性的颗粒源,π介子动量谱和椭圆流变化很小。另一方面,粘度对HBT半径$R_{\rm out}$的影响相当大。它使得细粒度源模型中的 $R_{\rm out}$ 减少。结合π介子横向动量谱、椭圆流和HBT半径的实验数据确定了颗粒源的模型参数,并研究了粘度对模型参数的影响。结果表明,颗粒源模型可以再现$\sqrt{s_{NN}}=200$ GeV处的Au-Au和$\sqrt{s_{NN}}=2.76$ TeV处的Pb-Pb重离子碰撞中不同中心性区间的π介子横向动量谱、椭圆流和HBT半径的实验数据。液滴的粘度导致颗粒源模型中初始液滴半径的增大和源壳参数的减小。
We examine the evolution of quark-gluon plasma (QGP) droplets with viscous hydrodynamics and analyze the pion transverse-momentum spectrum, elliptic flow, and Hanbury-Brown-Twiss (HBT) interferometry in a granular source model consisting of viscous QGP droplets. The shear viscosity of the QGP droplet speeds up and slows down the droplet evolution in the central and peripheral regions of the droplet, respectively. The effect of the bulk viscosity on the evolution is negligible. Although there are viscous effects on the droplet evolution, the pion momentum spectrum and elliptic flow change little for granular sources with and without viscosity. On the other hand, the influence of viscosity on HBT radius $R_{\rm out}$ is considerable. It makes $R_{\rm out}$ decrease in the granular source model. We determine the model parameters of granular sources using the experimental data of pion transverse-momentum spectrum, elliptic flow, and HBT radii together, and investigate the effects of viscosity on the model parameters. The results indicate that the granular source model may reproduce the experimental data of pion transverse-momentum spectrum, elliptic flow, and HBT radii in heavy-ion collisions of Au-Au at $\sqrt{s_{NN}}=200$ GeV and Pb-Pb at $\sqrt{s_{NN}}=2.76$ TeV in different centrality intervals. The viscosity of the droplet leads to an increase in the initial droplet radius and a decrease of the source shell parameter in the granular source model.
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