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Mott Effect and J/Psi Dissociation at the Quark-Hadron Phase Transition

D. Blaschke·G. Burau·Yu. Kalinovsky·T. Barnes
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Abstract

We investigate the in-medium modification of pseudoscalar and vector mesons in a QCD motivated chiral quark model by solving the Dyson-Schwinger equations for quarks and mesons at finite temperature for a wide mass range of meson masses, from light (pi, rho) to open-charm (D, D*) states. At the chiral / deconfinement phase transition, the quark-antiquark bound states enter the continuum of unbound states and become broad resonances (the hadronic Mott effect). We calculate the in-medium cross sections for charmonium dissociation due to collisions with light hadrons in a chiral Lagrangian approach, and show that the D and D* meson spectral broadening lowers the threshold for charmonium dissociation by pi and rho meson impact. This leads to a step-like enhancement in the reaction rate. We suggest that this mechanism for enhanced charmonium dissociation may be the physical mechanism underlying the anomalous J/Psi suppression observed by NA50.

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D. Blaschke, G. Burau, Yu. Kalinovsky, T. Barnes. 2002-11-28. Mott Effect and J/Psi Dissociation at the Quark-Hadron Phase Transition. https://doi.org/10.1140/epja%2Fi2002-10280-8

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