2019 Impact factor 2.176
Hadrons and Nuclei


Eur. Phys. J. A 11, 457-465 (2001)

Excitation of color degrees of freedom of nuclear matter and $J/\psi$ suppression

J. Hüfner1, 2, B.Z. Kopeliovich2, 3 and A. Polleri1

1  Institut für Theoretische Physik der Universität, Philosophenweg 19, D-69120 Heidelberg, Germany
2  Max Planck Institut für Kernphysik, Postfach 103980, D-69029 Heidelberg, Germany
3  Joint Institute for Nuclear Research, Dubna 141980, Moscow Region, Russia

polleri@physik.tu-muenchen.de

(Received: 6 November 2000 / Revised version: 11 April 2001 Communicated by A. Schäfer)

Abstract
In high-energy nuclear collisions, the conventional Glauber model is commonly used to evaluate the contribution to $J/\psi$ suppression originating from the inelastic interaction with colorless bound nucleons. This requires an effective value for the $J/\psi$-nucleon absorption cross-section which is larger than theoretically expected. On the other hand, multiple nucleon-nucleon collisions, mediated by color exchange interactions, excite their color degrees of freedom. We investigate the importance of this effect and find that these excited states provide a larger cross-section for $J/\psi$ absorption. We conclude that the related corrections are important to explain the effective value extrapolated from experiment.

PACS
25.75.Dw - Particle and resonance production.

© Società Italiana di Fisica, Springer-Verlag 2001