Speaker
Description
Spin alignment of vector mesons (e.g. K$^{\star}$$^{0}$) and global polarization of hyperons (e.g. $\Lambda$) in non-central high energy heavy-ion collisions could occur due to large initial angular momentum of the system. The spin alignment could also occur during the process of hadronization. The spin alignment of K$^{\star}$$^{0}$ is measured using a parameter $\rho_{00}$ characterising the angular distribution of the vector mesons w.r.t. the normal to the production plane at midrapidity. The measurements of $\rho_{00}$ will be presented for pp collisions at $\sqrt{s}$ = 13 TeV and for Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV. The centrality dependence of $\rho_{00}$ will also be presented. The $\rho_{00}$ values for K$^{\star}$$^{0}$ vector mesons are compared to the corresponding values for K$\mathrm{_S}^{0}$ mesons in Pb-Pb collisions. The global polarization measurements for $\Lambda$ and $\bar{\Lambda}$ hyperons will be presented for different collision centralities in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV. The dependence of global polarization of hyperons on their transverse momenta and rapidity will also be presented.
| List of tracks | QCD phase diagram (BES) |
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