Jörg Hüfner | Searcharxiv

arXiv2000

Color degrees of freedom in nuclear collisions and charmonium suppression

In high energy nuclear collisions, the Glauber model is commonly used to evaluate $J/ψ$ suppression due to inelastic interaction with colorless bound nucleons. This requires an effective value for the $J/ψ$-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 conclude that the related corrections are important to explain the effective value extrapolated from experiment.

hep-ph↗

arXiv2000

Excitation of Color Degrees of Freedom of Nuclear Matter and $J/ψ$ Suppression

In high energy nuclear collisions, the conventional Glauber model is commonly used to evaluate the contribution to $J/ψ$ suppression originating from the inelastic interaction with colorless bound nucleons. This requires an effective value for the $J/ψ$-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 $J/ψ$ absorption. We conclude that the related corrections are important to explain the effective value extrapolated from experiment.

hep-ph↗