Global <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="normal">Λ</mml:mi></mml:math> polarization in moderately relativistic nuclear collisions

Abstract

Predictions are made for the global polarization of $\mathrm{\ensuremath{\Lambda}}$ hyperons in $\mathrm{Au}+\mathrm{Au}$ collisions at moderately relativistic collision energies, 2.4 $\ensuremath{\le}\sqrt{{s}_{NN}}\ensuremath{\le}$ 11 GeV. These are based on the thermodynamic approach to the global polarization incorporated into the model of the three-fluid dynamics. Centrality dependence of the polarization is studied. It is predicted that the polarization reaches a maximum or a plateau (depending on the equation of state and centrality) at $\sqrt{{s}_{NN}}\ensuremath{\approx}$ 3 GeV. It is found that the global polarization increases with increasing width of the rapidity window around the midrapidity.

Topics & Concepts