Properties of charmonia in a hot equilibrated medium

Abstract

We investigate the properties of charmonia in a thermal medium, showing that with increasing temperature the decay widths of these mesons behave in a non-trivial way. Our analysis is based on a potential model with interaction potential extracted from thermal lattice QCD calculations of the free-energy of a static quark-antiquark pair. We find that in the crossover region some decay widths are extremely enhanced, which might be interpreted as a signature of the transition from hadronic matter to the deconfined phase. In particular, at temperatures $T\sim T_c$ the decay widths of the $J/\Psi$ that depend on the value of the wave function at the origin are enhanced with respect to the values in vacuum by about a factor 2. In the same temperature range the decay width of the process ${\chi }_{cJ}\to J/\Psi +\gamma$ is enhanced by approximately a factor 6 with respect to the value in vacuum. At higher temperatures the charmonia states dissociate and the widths of both decay processes become vanishing small.

minor changes, references added, almost matches published version

References in corpus (11)

• Charmonium
• Static quark-antiquark pairs at finite temperature
• Heavy-Quark Kinetics in the QGP at LHC
• Thermal Dileptons at LHC
• Nonperturbative Heavy-Quark Diffusion in the Quark-Gluon Plasma
• Real and imaginary-time $Q\bar{Q}$ correlators in a thermal medium
• Color Screening Melts Quarkonium
• Charmonium at high temperature in two-flavor QCD
• T-Matrix Approach to Quarkonium Correlation Functions in the QGP
• Doubly heavy baryons in a Salpeter model with AdS/QCD inspired potential
• η_b and η_c radiative decays in the Salpeter model with the AdS/QCD inspired potential