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arXiv · 1705.10110

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

Shile Chen·Min He
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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 $J/ψ$ and accounts for $\sim 10\%-25\%$ of the total ($E1+M1$) dissociation rate at temperatures close to the transition temperature.

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Shile Chen, Min He. 2017-05-29. Gluo-dissociation of Heavy Quarkonium in the Quark-Gluon Plasma Revisited. https://doi.org/10.1103/physrevc.96.034901

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