Quarkonium dissociation in perturbative QCD

Abstract

For weakly bound quarkonia, we rederive the next-to-leading order cross sections of quarkonium dissociation by partons that include the hard thermal loop (HTL) resummation. Our results calculated with an effective vertex from the Bethe-Salpeter amplitude reduce to those obtained by potential nonrelativistic QCD (pNRQCD) in the relevant kinematical limit, and they can be used in a wide temperature range applicable to heavy quark systems in heavy ion collisions. Based on the lattice computation of the temperature-dependent binding energy, our numerical analysis on ${\rm Y}(1S)$ indicates that at high temperature the dominant mechanism for quarkonium dissociation is inelastic parton scattering as expected in the quasifree approximation, while it is the gluo-dissociation at low temperature. By comparing with the momentum diffusion coefficient of a heavy quark, we discuss possible O(g) corrections to the next-to-leading order thermal width.

18 pages, 10 figures

References in corpus (9)

• Static quark-antiquark pairs at finite temperature
• Observation of sequential Upsilon suppression in PbPb collisions
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• Quarkonium suppression in heavy-ion collisions: an open quantum system approach
• Heavy quark diffusion in perturbative QCD at next-to-leading order
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• Upsilon production in U+U collisions at 193 GeV with the STAR experiment
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Cited by in corpus (5)

• Heavy Quarkonium in Extreme Conditions
• Rapid bound-state formation of Dark Matter in the Early Universe
• ${\rm Y}(1S)$ transverse momentum spectra through dissociation and regeneration in heavy ion collisions
• $J/\psi$ near $T_c$
• Energy loss of heavy quarkonia in hot QCD plasmas