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

  • 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 Rout is considerable. It makes Rout 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 √sNN=200 GeV and Pb-Pb at √sNN=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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Jing Yang, Wei-Ning Zhang and Yan-Yu Ren. Pion transverse-momentum spectrum, elliptic flow, and Hanbury-Brown-Twiss interferometry in a viscous granular source model[J]. Chinese Physics C, 2017, 41(8): 084102. doi: 10.1088/1674-1137/41/8/084102
Jing Yang, Wei-Ning Zhang and Yan-Yu Ren. Pion transverse-momentum spectrum, elliptic flow, and Hanbury-Brown-Twiss interferometry in a viscous granular source model[J]. Chinese Physics C, 2017, 41(8): 084102.  doi: 10.1088/1674-1137/41/8/084102 shu
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Received: 2017-02-23
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    Supported by National Natural Science Foundation of China (11675034,11275037)

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

    Corresponding author: Wei-Ning Zhang,
  • 1.  School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, Liaoning 116024, China
  • 2. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, Liaoning 116024, China
  • 3. Department of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150006, China
  • 4.  Department of Physics, Harbin Institute of Technology, Harbin, Heilongjiang 150006, China
Fund Project:  Supported by National Natural Science Foundation of China (11675034,11275037)

Abstract: 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 Rout is considerable. It makes Rout 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 √sNN=200 GeV and Pb-Pb at √sNN=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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