Gluo-dissociation of Heavy Quarkonium in the Quark-Gluon Plasma Revisited

Abstract

Using an effective Hamiltonian derived from the QCD multipole expansion, we calculate the cross sections of gluo-dissociation of heavy quarkonia in the quark-gluon plasma, by including both the chromo-electric dipole ($E_1$) as well as the chromo-magnetic dipole ($M_1$) transition mechanisms. While the former allows to reproduce the results from operator-product-expansion calculations in the Coulomb approximation, the latter as a novel contribution is shown to be significant at low energies close to the threshold. Using thus obtained cross sections, we further carry out a full calculation of the gluo-dissociation rates for various charmonia and bottomonia within a non-relativitic in-medium potential model. The $M_1$ contribution turns out to be most prominent for the $J/\psi$ and accounts for $\sim 10\%-25\%$ of the total ($E1+M1$) dissociation rate at temperatures close to the transition temperature.

arXiv comment9 pages, 5 figures

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• Nuclear modification of ${\rm Y}$ states in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Charmonium Triangular Flow in High Energy Nuclear Collisions
• Heavy Quarkonium Dissociation by Thermal Gluons at Next-to-leading Order in the Quark-Gluon Plasma
• Magnetic field induced hair structure in charmonium gluon-dissociation
• Spin alignment of quarkonia in vortical quark-gluon plasma
• Polarized Dissociation and Spin Alignment of Moving Quarkonium in Quark-Gluon Plasma
• Suppression of quarkonia in PbPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV