Speaker
Description
We investigate the hydrodynamic helicity polarization of $\Lambda$ hyperons and the spin alignment of $\phi$ mesons at RHIC-BES energies by utilizing the relativistic (3+1)D CLVisc hydrodynamics framework with SMASH and AMPT initial conditions.
As opposed to local spin polarization at high energy collisions, our hydrodynamic simulations demonstrate that the helicity polarization induced by the kinetic vorticity dominates over other contributions at intermediate and low collision energies. Our findings provide an opportunity to probe the fine structure of local kinetic vorticity as a function of azimuthal angle at intermediate and low collision energies by mapping our predictions to the future measurements in experiments.
When it comes to the spin alignment contributed by the hydrodynamic effects, our study indicates that when hydrodynamic effects are considered in conjunction with the fluctuations of effective $\phi$ meson field , the theoretical results exhibit improved agreement with experimental data on spin alignment as a function of $p_{T}$.
| Category | Theory |
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