Spectra and Elliptic Flow of (Multi)Strange Hadrons at RHIC and LHC within Viscous Hydrodynamics + Hadron Cascade Hybrid Model

Abstract

Using the (2+1)-dimensional ultrarelativistic viscous hydrodynamics + hadron cascade,VISHNU, hybrid model, we study thepT-spectra and elliptic flow ofΛ,Ξ, andΩin Au + Au collisions atsNN= 200 GeV and in Pb + Pb collisions atsNN= 2.76 TeV. Comparing our model results with the data measurements, we find that theVISHNUmodel gives good descriptions of the measurements of these strange and multistrange hadrons at several centrality classes at RHIC and LHC. Mass ordering of elliptic flowv2amongπ,K,p,Λ,Ξ, andΩare further investigated and discussed at the two collision systems. We find that, at both RHIC and LHC,v2mass ordering amongπ,K,p, andΩis fairly reproduced within theVISHNUhybrid model, and more improvements are needed to be implemented for well describingv2mass ordering amongp,Λ, andΞ.