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2024年10月30日
Chinese Physics C> 2012, Vol. 36> Issue(5) : 410-422 DOI: 10.1088/1674-1137/36/5/006

Two-pion interferometry for viscous hydrodynamic sources

  • The space-time evolution of the (1+1)-dimensional viscous hydrodynamics with an initial quark-gluon plasma (QGP) produced in ultrarelativistic heavy ion collisions is studied numerically. The particle-emitting 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.
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Efaaf M, SU Zhong-Qian and ZHANG Wei-Ning. Two-pion interferometry for viscous hydrodynamic sources[J]. Chinese Physics C, 2012, 36(5): 410-422. doi: 10.1088/1674-1137/36/5/006
Efaaf M, SU Zhong-Qian and ZHANG Wei-Ning. Two-pion interferometry for viscous hydrodynamic sources[J]. Chinese Physics C, 2012, 36(5): 410-422.  doi: 10.1088/1674-1137/36/5/006 shu
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Received: 2011-08-31
Revised: 2011-08-31
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Two-pion interferometry for viscous hydrodynamic sources

  • Received Date: 2011-08-31
  • Accepted Date: 2011-08-31
  • Available Online: 2012-05-05

Abstract: The space-time evolution of the (1+1)-dimensional viscous hydrodynamics with an initial quark-gluon plasma (QGP) produced in ultrarelativistic heavy ion collisions is studied numerically. The particle-emitting 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.

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