Two-pion interferometry for viscous hydrodynamic sources

The space-time evolution of the （1＋1）-dimensional viscous hydrodynamics with an initial quarkgluon plasma （QGP） produced in ultrarelativistic heavy ion collisions is studied numerically. The particleemitting sources undergo a crossover transition from the QGP to hadronic gas. We take into account a...

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Bibliographic Details
Published inChinese physics C Vol. 36; no. 5; pp. 410 - 422
Main Author 安飞 苏中乾 张卫宁
Format Journal Article
LanguageEnglish
Published 01.05.2012
Subjects
Computational fluid dynamics
Crossovers
Evolution
Fluid flow
HBT
Hydrodynamics
Interferometry
Shear viscosity
Viscosity
π介子
剪切粘度
干涉
数值模拟
时空演化
相对论重离子碰撞
粘性流体力学
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ISSN1674-1137
0254-3052
DOI10.1088/1674-1137/36/5/006

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Summary:The space-time evolution of the （1＋1）-dimensional viscous hydrodynamics with an initial quarkgluon plasma （QGP） produced in ultrarelativistic heavy ion collisions is studied numerically. The particleemitting sources undergo a crossover transition from the QGP to hadronic gas. We take into account a usual shear viscosity for the strongly coupled QGP as well as the bulk viscosity which increases significantly in the crossover region. The two-pion Hanbury-Brown-Twiss （HBT） interferometry for the viscous hydrodynamic sources is performed. The HBT analyses indicate that the viscosity effect on the two-pion HBT results is small if only the shear viscosity is taken into consideration in the calculations. The bulk viscosity leads to a larger transverse freeze-out configuration of the pion-emitting sources, and thus increases the transverse HBT radii. The results of the longitudinal HBT radius for the source with Bjorken longitudinal scaling are consistent with the experimental data.
Bibliography:Efaaf M. J. 1 SU Zhong-Qian1 ZHANG Wei-Ning1,2;1） 1 School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China 2 Department of Physics, Harbin Institute of Technology, Harbin 150006, China
11-5641/O4
The space-time evolution of the （1＋1）-dimensional viscous hydrodynamics with an initial quarkgluon plasma （QGP） produced in ultrarelativistic heavy ion collisions is studied numerically. The particleemitting sources undergo a crossover transition from the QGP to hadronic gas. We take into account a usual shear viscosity for the strongly coupled QGP as well as the bulk viscosity which increases significantly in the crossover region. The two-pion Hanbury-Brown-Twiss （HBT） interferometry for the viscous hydrodynamic sources is performed. The HBT analyses indicate that the viscosity effect on the two-pion HBT results is small if only the shear viscosity is taken into consideration in the calculations. The bulk viscosity leads to a larger transverse freeze-out configuration of the pion-emitting sources, and thus increases the transverse HBT radii. The results of the longitudinal HBT radius for the source with Bjorken longitudinal scaling are consistent with the experimental data.
two-pion interferometry; viscous hydrodynamic sources; bulk viscosity; shear viscosity
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ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/36/5/006