Mott effect and \(J/\psi\) dissociation at the quark-hadron phase transition

  • D. BlaschkeEmail author
  • G. Burau
  • Yu Kalinovsky
  • T. Barnes


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 (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 \(\rho\)-mesons. 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.


Phase Transition Vector Meson Quark Model Finite Temperature Mott Effect 
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Copyright information

© Springer-Verlag Berlin/Heidelberg 2003

Authors and Affiliations

  • D. Blaschke
    • 1
    • 2
    Email author
  • G. Burau
    • 1
  • Yu Kalinovsky
    • 3
  • T. Barnes
    • 4
    • 5
  1. 1.Department of Physics University of RostockRostockGermany
  2. 2.Bogoliubov Laboratory for Theoretical PhysicsJINR DubnaDubnaRussia
  3. 3.Laboratory for Information TechnologiesJINR DubnaDubnaRussia
  4. 4.Oak Ridge National LaboratoryOak RidgeUSA
  5. 5.Department of Physics and AstronomyUniversity of TennesseeKnoxvilleUSA

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