Temperature-independent shear viscosity in a multiphase transport model for relativistic heavy ion collisions

Using a multiphase transport (AMPT) model, we study the dependence on the specific shear viscosity of the transverse momentum spectra, Hanbury Brown-Twiss parameters, and elliptic flow with a temperature-independent shear viscous approach. The shear viscosity strengthens the transverse pressure gradients, raises the transverse momentum spectra, and gives smaller values of Ro, Rl, and Ro/Rs, but increases value of Rs. The transverse momentum dependence of v2 is suppressed with increasing η/s and can hold at finite η/s within a partonic cascade approach in the AMPT model.