Speaker
Description
Global spin alignment is a preferential alignment of a particle’s spin along the orbital an6 gular momentum produced in heavy-ion collisions. The global spin alignment of vector mesons ($J^P$ = $1^−$) $\phi$ and $K^{\ast 0}$ may be sensitive to the vorticity and hadronization mechanism in the medium. The second phase of RHIC Beam Energy Scan (BES-II) program provides new and higher statistics data sets for Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7-19.6 GeV. From this data, we can make high precision measurements of $\phi$ and $K^{\ast 0}$ global spin alignment, allowing for more differential studies not possible with the BES-I data. We can also compare global spin alignment between $\phi$ and $K^{\ast 0}$, where the lifetime of $\phi$ is roughly ten times larger than that of $K^{\ast 0}$ and the latter is more sensitive to hadronic re-scattering. In this talk, we report high precision measurements for the global spin alignment of $\phi$ and $K^{\ast 0}$ at $\sqrt{s_{NN}}$ = 14.6 and 19.6 GeV from BES-II.
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