Dissociation of Heavy Quarkonia in the Quark-Gluon Plasma

Abstract

Using a temperature-dependent potential obtained from lattice gauge calculations, we study the stability of heavy quarkonia in the quark-gluon plasma. We find that only the Upsilon(1S) and the eta_b(1S) are bound in the quark-gluon plasma, and have a small binding energy. The quark-gluon plasma may be revealed by an Upsilon(1S) dilepton peak with an invariant mass close to twice the current b quark mass, which is lower than the Upsilon(1S) mass in free space. The quarkonia Upsilon(1S) and eta_b(1S) can dissociate by collision with quarks and gluons in the quark-gluon plasma. We evaluate the dissociation cross section of the Upsilon(1S) due to gluon absorption. The Upsilon(1S) and the eta_b(1S) can also dissociate spontaneously at temperatures above the dissociation temperature 1.11T_c, where T_c is the quark-gluon plasma phase transition temperature. At temperatures slightly above the dissociation temperature these states appear as resonances, which provides another signature for the quark-gluon plasma.

19 pages, in LaTex, add an appendix and a figure

References in corpus (5)

• Quark Mass and Flavour Dependence of the QCD Phase Transition
• Quarkonium Feed-Down and Sequential Suppression
• String Breaking and Quarkonium Dissociation at Finite Temperatures
• Heavy Quarkonium Dissociation Cross Sections in Relativistic Heavy-Ion Collisions
• Dissociation of a Heavy Quarkonium at High Temperatures

Cited by in corpus (19)

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• Momentum spectra of charmonium produced in a quark-gluon plasma
• Heavy quark bound states above $T_c$
• Quarkonia in the deconfined phase: effective potentials and lattice correlators
• D mesons in matter and the in-medium properties of charmonium
• Color Screening and Quark-Quark Interactions in Finite Temperature QCD
• The Momentum Kick Model Description of the Near-Side Ridge and Jet Quenching
• Potential Models and Lattice Gauge Current-Current Correlators
• Quarkonia and Quark Drip Lines in Quark-Gluon Plasma
• Momentum Kick Model Analysis of PHENIX Near-Side Ridge Data and Photon Jet
• Static quark anti-quark free and internal energy in 2-flavor QCD
• Gluo-dissociation of Heavy Quarkonium in the Quark-Gluon Plasma Revisited
• Heavy Quarkonium Dissociation by Thermal Gluons at Next-to-leading Order in the Quark-Gluon Plasma
• Existence of mesons after deconfinement
• Heavy Quarkonia and Quark Drip Lines in Quark-Gluon Plasma
• The Role of Produced Hadrons in J/psi Suppression
• Free Quarks and Antiquarks versus Hadronic Matter