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

摘要

Using the (2 + 1)-dimensional ultrarelativistic viscous hydrodynamics + hadron cascade, VISHNU, hybrid model, we study the p(T)-spectra and elliptic flow of Lambda, Xi, and Omega in Au + Au collisions at root s(NN) = 200 GeV and in Pb + Pb collisions at root s(NN) = 2.76 TeV. Comparing our model results with the data measurements, we find that the VISHNU model gives good descriptions of the measurements of these strange and multistrange hadrons at several centrality classes at RHIC and LHC. Mass ordering of elliptic flow v(2) among pi, K, p, Lambda, Xi, and Omega are further investigated and discussed at the two collision systems. We find that, at both RHIC and LHC, V 2 mass ordering among pi, K, p, and Omega is fairly reproduced within the VISHNU hybrid model, and more improvements are needed to be implemented for well describing v(2) mass ordering among p, Lambda, and Xi.