Chinese Physics C > 2023, Vol. 47 > Issue(10): 104105 DOI: 10.1088/1674-1137/acf036

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

Minghua Wei^1,,,
Mei Huang^2,,

1.
Institute of Modern Physics, Fudan University, Shanghai 200433, China
2.
School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China

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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 ϕand ρinduced 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 $ \phi,\rho $ mesons $ M_{\phi,\rho}(\Omega)\simeq M_{\phi,\rho}(\Omega=0)-s_{z}\Omega $ . This behavior contributes to the spin alignment of vector mesons $ \phi,\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.
- spin alignment,
- QCD medium,
- vector meson

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Minghua Wei and Mei Huang. Spin alignment of vector mesons from quark dynamics in a rotating medium[J]. Chinese Physics C. doi: 10.1088/1674-1137/acf036

Minghua Wei and Mei Huang. Spin alignment of vector mesons from quark dynamics in a rotating medium[J]. Chinese Physics C. doi:10.1088/1674-1137/acf036 shu

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Received: 2023-05-19

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

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