Study of Lambda polarization in relativistic nuclear collisions at sqrts_NN = 7.7-200 GeV

2016/10/31 by Iu. Karpenko, F. Becattini · 1 citation
Physics and Astronomy · #nucl-th #hep-ph

paper · pdf · doi:10.1140/epjc/s10052-017-4765-1

published as Eur. Phys. J. C (2017) 77: 213 · 10 pages, 9 figures. Final version published in EPJC

arxiv created 2017/04/06 · arxiv updated 2017/04/07

Abstract

We present a calculation of the global polarization of Lambda hyperons in relativistic Au-Au collisions at RHIC Beam Energy Scan range sqrts_NN = 7.7 - 200 GeV with a 3+1 dimensional cascade + viscous hydro + cascade model, UrQMD+vHLLE. Within this model, the mean polarization of Lambda in the out-of-plane direction is predicted to decrease rapidly with collision energy from a top value of about 2% at the lowest energy examined. We explore the connection between the polarization signal and thermal vorticity and estimate the feed-down contribution to Lambda polarization due to the decay of higher mass hyperons.

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