J/psi and etac in the nuclear medium: QCD sum rule approach
Frank Klingl, Sungsik Kim, Su Houng Lee, Philippe Morath, Wolfram Weise
Abstract
We investigate the masses of the lowest cc states, the J/psi and etac, in nuclear matter using QCD sum rules. Up to dimension four, the differences between the operator product expansions in vacuum and in medium arise from the density-dependent change in the gluon condensate and from a new contribution proportional to the nucleon expectation value of the twist-2 gluon operator. Both terms together give an attractive shift of about 5-10 MeV to the J/psi and etac masses in nuclear matter.
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