Polarized Dissociation and Spin Alignment of Moving Quarkonium in Quark-Gluon Plasma

Abstract

Recent experiments have found spin alignment of $J/\psi$ with respect to event plane in heavy ion collisions, suggesting a medium effect that is spin dependent. We propose a possible mechanism with polarized dissociation from the motion of $J/\psi$ with respect to the medium. We calculate polarized dissociation rate for quarkonium spin triplet state from spin chromomagnetic coupling in the potential non-relativistic QCD framework. This is done for the leading order gluo-dissociation process and next to leading order inelastic Coulomb scattering process. The polarized dissociation rate is expressed as a function of relative velocity between quarkonium and QGP and the quantization axis. Applying the polarized dissociation rate to quarkonium evolution with dissociation effect only in a Bjorken flow, we find the spin $0$ state to dissociate less than the other spin states, leading to positive ${\rho }_{00}-1/3$. Regeneration contribution is expected to give a contribution with the opposite sign.

28 pages, 8 figures

References in corpus (9)

• Pattern of Global Spin Alignment of $\varphi$ and $K^{\ast 0}$ mesons in Heavy-Ion Collisions
• Transverse Momentum Spectra of J/ψin Heavy-Ion Collisions
• Spin alignment of vector mesons in heavy-ion collisions
• Measurement of the J/$\psi$ polarization with respect to the event plane in Pb-Pb collisions at the LHC
• Spin alignment of vector mesons by glasma fields
• Vector meson's spin alignments in high energy reactions
• Gluo-dissociation of Heavy Quarkonium in the Quark-Gluon Plasma Revisited
• The spin alignment of vector mesons with light front quarks
• Quarkonium Polarization in Medium from Open Quantum Systems and Chromomagnetic Correlators

Cited by in corpus (1)

• Spin alignment of quarkonia in vortical quark-gluon plasma