Gluo-dissociation of heavy quarkonium in the quark-gluon plasma reexamined

Shile Chen and Min He
Phys. Rev. C 96, 034901 – Published 5 September 2017

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 (E1) and the chromo-magnetic dipole (M1) 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 M1 contribution turns out to be most prominent for the J/ψ and accounts for 10%–25% of the total (E1+M1) dissociation rate at temperatures close to the transition temperature.

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  • Received 20 June 2017

DOI:https://doi.org/10.1103/PhysRevC.96.034901

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Shile Chen and Min He*

  • Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China

  • *Corresponding author: minhephys@gmail.com

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Issue

Vol. 96, Iss. 3 — September 2017

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