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 () and the chromo-magnetic dipole () transition mechanisms. While the former allows us 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 nonrelativistic in-medium potential model. The contribution turns out to be most prominent for the and accounts for 10%–25% of the total () dissociation rate at temperatures close to the transition temperature.
- Received 20 June 2017
DOI:https://doi.org/10.1103/PhysRevC.96.034901
©2017 American Physical Society