Apr 23 – 27, 2023
JMS Aster Plaza
Asia/Tokyo timezone

Spin alignment of vector mesons in a rotating medium:a NJL model study

Apr 25, 2023, 5:00 PM
Multi-Purpose Studio, 2nd Floor (JMS Aster Plaza)

Multi-Purpose Studio, 2nd Floor

JMS Aster Plaza

Poster Intense field and vorticity Poster Session


Minghua Wei (Fudan University)


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

Primary authors

Mei Huang Minghua Wei (Fudan University)

Presentation materials