Spin alignment of vector mesons from quark dynamics in a rotating medium

Abstract

Vorticities in heavy-ion collisions (HICs) are supposed to induce spin alignment and polarization phenomena of quarks and mesons. In this work, we analyze the spin alignment of vector mesons $\varphi$ and $\rho$ induced by rotation from quark dynamics in the framework of the Nambu-Jona-Lasinio (NJL) model. The rotating angular velocity induces mass splitting of spin components for vector $\varphi ,\rho$ mesons $M_{\varphi ,\rho }(\Omega )\simeq M_{\varphi ,\rho }(\Omega =0)-s_z\Omega$. This behavior contributes to the spin alignment of vector mesons $\varphi ,\rho$ in an equilibrium medium and naturally explains the negative deviation of ${\rho }_{00}-1/3$ for vector mesons. Incidentally, the positive deviation of ${\rho }_{00}-1/3$ under the magnetic field can also be easily understood from quark dynamics.

arXiv comment12 pages, 8 figures

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Cited by in corpus (6)

• Vector and Tensor Spin Polarization for Vector Bosons at Local Equilibrium
• Chiral phase transition and spin alignment of vector mesons with chiral imbalance in a rotating QCD medium
• Chiral and deconfinement transitions in spin-polarized quark matter
• Spectral function for pions in magnetic field
• Production of $K^{+}{K}^{-}$ Pairs Through Decay of $\varphi$ Meson
• Chromomagnetic Condensate in Finite-Temperature SU(2) Yang-Mills Theory under Imaginary Rotation