Spin alignment of vector mesons by glasma fields

Abstract

We explain how spin alignment of vector mesons can be induced by background fields, such as electromagnetic fields or soft gluon fields. Our study is based on the quantum kinetic theory of spinning quarks and antiquarks and incorporates the relaxation of the dynamically generated spin polarization. The spin density matrix of vector mesons is obtained by quark coalescence via the Wigner function and kinetic equation. Our approach predicts a local spin correlation that is distinct from the non-local expressions previously obtained in phenomenological derivations. We estimate the magnitude of such local correlations in the glasma model of the preequilibrium phase of relativistic heavy ion collisions. It is found that the resulting spin alignment could be greatly enhanced and may be comparable to the experimental measurement in order of magnitude. We further propose new phenomenological scenarios to qualitatively explain the transverse-momentum and centrality dependence of spin alignment in a self-consistent framework.

arXiv comment47 pages, 9 figures, minor revisions and extension, journal version

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• Vector meson's spin alignments in high energy reactions
• Spin alignment of vector mesons from quark dynamics in a rotating medium
• Collisional corrections to spin polarization from quantum kinetic theory using Chapman-Enskog expansion
• Transverse and longitudinal spin alignment from color fields in heavy ion collisions
• Vector and Tensor Spin Polarization for Vector Bosons at Local Equilibrium
• Mean free path of photons in relativistic heavy ion collisions
• Quarkonium Polarization in Medium from Open Quantum Systems and Chromomagnetic Correlators
• Spin alignment of $K^{\ast }$ induced by strange-baryon density inhomogeneity
• Spin alignment of quarkonia in vortical quark-gluon plasma
• First measurement of D${}^{\ast +}$ vector spin alignment in Pb$-$Pb collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=5.02$ TeV
• Anisotropic linear waves and breakdown of the momentum expansion in spin magnetohydrodynamics
• Polarized Dissociation and Spin Alignment of Moving Quarkonium in Quark-Gluon Plasma
• Production of $K^{+}{K}^{-}$ Pairs Through Decay of $\varphi$ Meson
• Tensor spin polarization induced by curved freeze-out hypersurface