Chiral Symmetry Restoration and Anomalous J/ψ Suppression

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概要

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• We investigate the in-medium modification of pseudoscalar and vector mesons within a QCD motivated chiral quark model by solving the Dyson-Schwinger equations for quarks and mesons at finite temperature in the wide mass range from light mesons (π, σ ρ) to open-charm mesons (D, D^*). At the chiral/deconfinement phase transition, the quark-antiquark bound states enter the continuum of unbound states and become broad resonances (Mott effect). We calculate the in-medium cross section for charmonium breakup processes due to light hadron impact within a chiral Lagrangian approach and show that the Mott effect for the D-mesons effectively reduces the threshold for charmonium breakup and leads to a step-like behaviour of the reaction rate. This is suggested as an explanation of the anomalous J/ψ suppression phenomenon in the NA50 experiment.

• 2003-07-18

著者

• Blaschke D.

  Department Of Physics University Of Rostock:bogoliubov Laboratory For Theoretical Physics Jinr Dubna

• BURAU G.

  Department of Physics, University of Rostock

• KALINOVSKY Yu.L.

  Laboratory for Information Technologies, JINR Dubna

• YUDICHEV V.L.

  Bogoliubov Laboratory for Theoretical Physics, JINR Dubna

• Burau G.

  Department Of Physics University Of Rostock

• Yudichev V.l.

  Bogoliubov Laboratory For Theoretical Physics Jinr Dubna

• Kalinovsky Yu.l.

  Laboratory For Information Technologies Jinr Dubna

• Kalinovsky Yu.

  Laboratory for Information Technologies, JINR Dubna

関連論文

• Chiral Symmetry Restoration and Anomalous J/ψ Suppression

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