Quarkonium dissociation in perturbative QCD

Juhee Hong, Su Houng Lee

Research output: Contribution to journalArticle

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 ϒ(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 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.

Original languageEnglish
Article number034905
JournalPhysical Review C
Volume99
Issue number3
DOIs
Publication statusPublished - 2019 Mar 15

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quantum chromodynamics
dissociation
partons
quarks
ionic collisions
numerical analysis
apexes
diffusion coefficient
binding energy
momentum
temperature
cross sections
approximation
scattering

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

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title = "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 ϒ(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 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.",
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Quarkonium dissociation in perturbative QCD. / Hong, Juhee; Lee, Su Houng.

In: Physical Review C, Vol. 99, No. 3, 034905, 15.03.2019.

Research output: Contribution to journalArticle

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