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Holographic spin alignment of $J/\psi$ meson in magnetized plasma
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abstract
We study the mass spectra and spin alignment of vector meson $J/\psi$ in a thermal magnetized background using a generalized theoretical framework based on gauge/gravity duality. Utilizing a soft wall model for the QGP background and a massive vector field for the $J/\psi$ meson, we delve into the meson's spectral function and spin parameters $(\lambda_{\theta},\, \lambda_\varphi,\,\lambda_{\theta\varphi})$ for different cases, assessing their response to variations in magnetic field strength, momentum, and temperature. We initially examine scenarios where a meson's momentum aligns parallel to the magnetic field in helicity frame. Our results reveal a magnetic field-induced positive $\lambda_\theta^\text{H}$ for low meson momentum, transitioning to negative with increased momentum. As a comparison, we also study the case of momentum perpendicular to the magnetic field and find the direction of magnetic field does not affect the qualitative behavior for the $eB$-dependence of $\lambda_\theta^\text{H}$. Moreover, we apply our model to real heavy-ion collisions for three different spin quantization directions. Further comparisons with experimental data show qualitative agreement for spin parameters $\lambda_{\theta}$ and $\lambda_\varphi$ in the helicity and Collins-Soper frames.
Forward citations
Cited by 5 Pith papers
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Spectral Functions of $J/\psi$ Meson in Rotating Thermal Background from Holography
In a rotating thermal medium modeled by soft-wall holography, J/ψ spectral peaks split by −ΩJ_z along the rotation axis and acquire projection-dependent distortions for transverse momentum.
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Gluon polarization contribution to the spin alignment of vector mesons from holography
A soft-wall holographic QCD model with a rotation-dependent gluon field predicts that rotation enhances the spin alignment of phi and rho mesons at high pT while J/psi stays nearly unaffected.
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Vector and Tensor Spin Polarization for Vector Bosons at Local Equilibrium
Vector meson spin alignment at local equilibrium is shown to arise only at second order in thermodynamic gradients, with explicit analytic formulas for the contributing terms.
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Polarization of the $\phi$ meson in the hadronic phase with nucleon scatterings and a viscous hydrodynamic background
Kaon and nucleon rescattering plus viscous corrections in a Fluidum hydrodynamic background yield phi spin alignment consistent with zero, in disagreement with STAR data.
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Schwinger Effect in a Twice Anisotropic Holographic Model
In a twice anisotropic holographic QCD model, magnetic anisotropy lowers the Schwinger pair-production barrier while spatial anisotropy raises it.
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