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The Effect of Hadronic Scatterings on the Measurement of Vector Meson Spin Alignments in Heavy-ion Collisions by Shen, Diyu; Chen, Jinhui; Lin, Zi-Wei is a scholarly article available to read on EtoBox.

What is The Effect of Hadronic Scatterings on the Measurement of Vector Meson Spin Alignments in Heavy-ion Collisions about?

Spin alignments of vector mesons and hyperons in relativistic heavy-ion collisions have been proposed as signals of the global polarization. The STAR experiment first observed the $\rm \Lambda$ polarization. Recently, the ALICE collaboration measured the transverse momentum ($p_T$) and the collision centrality dependence of $K^*$ and $\phi$ spin alignments in Pb-Pb collisions at $\rm \sqrt{s_{NN}}$ = 2.76 TeV. A large signal is observed in the low $p_T$ region of mid-central collisions for $K^*$ while the signal is much smaller for $\phi$, and these have not been understood yet. Since vector mesons have different lifetimes and their decay products have different scattering cross sections, they suffer from different hadronic effects. In this paper, we study the effect of hadronic interactions on the spin alignment of $K^*$, $\phi$ and $\rho$ mesons in relativistic heavy-ion collisions with a multi-phase transport model. We find that hadronic scatterings lead to a deviation of the observed spin alignment matrix element $\rho_{00}$ away from the true value for $\rho$ and $K^*$ mesons (with a bigger effect on $\rho$) while the effect is negligible for the $\phi$ meson. The effect depen

Author

Shen, Diyu; Chen, Jinhui; Lin, Zi-Wei

Published

2021

Language

EN