Search

In order to search for the origin of double-peak structure in di-hadron azimuthal correlation at RHIC, a γ-jet with known production point and momentum is triggered in a multi-phase transport model. Partonic medium presents different shapes of responses to different geometry configurations of triggered γ-jet. The key of the double-peak structure is found to be a strong shadowing effect of dense core, which is related to transverse expansion and radial flow of partonic matter. [ABSTRACT FROM AUTHOR]

The Hanbury-Brown Twiss (HBT) radii of Au+Au collisions at RHIC energy are investigated by a hydrodynamical expanding source with both shear (η) and bulk viscosities (ζ). With different height of the ratio of ζ to entropy density s, the ratio Rout/Rside of HBT radii can not describe the experimental data. But with large enough peak of ζ/s, the instability suggests that the source may clusterize which gives a hint to resolve the HBT puzzle. [ABSTRACT FROM AUTHOR]