Gluo-dissociation of Heavy Quarkonium in the Quark-Gluon Plasma Revisited
Shile Chen🇨🇳 · Min He🇨🇳
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 () as well as the chromo-magnetic dipole () 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 contribution turns out to be most prominent for the and accounts for of the total () dissociation rate at temperatures close to the transition temperature.