Vorticity in the QGP liquid and hyperon polarization at the RHIC BES energies

16th International Conference on Strangeness in Quark Matter

Karpenko, Iurii^1,2 ; Becattini, Francesco^1,3

INFN, Sezione di Firenze, Via G. Sansone 1, Sesto Fiorentino (Firenze)

I-50019, Italy^1

Bogolyubov Institute for Theoretical Physics, 14-b Metrolohichna st., Kiev

03680, Ukraine^2

Universitá di Firenze, Via G. Sansone 1, Sesto Fiorentino, Firenze

I-50019, Italy^3

关键词: Beam energies;    Collision energies;    Hyperon polarization;    Out-of-plane direction;    Polarization signals;    Rescattering;    Scan range;    State of the art;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/779/1/012068/pdf
DOI  :  10.1088/1742-6596/779/1/012068

来源: IOP

【 摘 要 】

We calculate the polarization of λ hyperons in Au-Au collisions at RHIC Beam Energy Scan range √sNN = 7:7; 200 GeV in a state-of-the-art 3+1 dimensional cascade + viscous hydro model vHLLE+UrQMD. We find that the polarization of λ in the out-of-plane direction decreases substantially with collision energy. We explore the connection between the polarization signal and thermal vorticity and discuss the feed-down and hadronic rescattering effects on the mean polarization of all produced λ hyperons.