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Description
Vorticities in heavy-ion collisions (HIC) are supposed to induce spin alignment and polarization phenomena of quarks and mesons. In this paper, we consider a uniformly rotating medium in which quark and anti-quark pairing are suppressed. Consequently, in the framework of Nambu-Jona-Lasinio (NJL) model, dynamical quark masses are descending as the angular velocities grow. In case of vector mesons, mass splitting will emerge among three different spin component $s_{z}=0,\pm 1$ along the axis of rotation (z-axis). Furthermore, in a thermal equilibrium system, the difference of mass spectra among $\phi_{s_{z}=0,\pm 1}$ will cause that vector meson with $s_{z}=+1$ will be preferred in a rotating medium. Correspondingly, $\phi$ mesons will be less possible to occupy the $s_{z}=0$ state which leads to spin alignment $\rho_{00}<\frac{1}{3}$.
| Theory / experiment | Theory |
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