J/psi and eta_c in the nuclear medium: QCD sum rule approach

Details J/psi and eta_c in the nuclear medium: QCD sum rule approach J/psi and eta_c in the nuclear medium: QCD sum rule approach

1998-11-20

arxiv.org/abs/nucl-th/9811070v2

Phys.Rev.Lett.82:3396-3399,1999; Erratum-ibid.83:4224,1999

Physics

Nuclear Physics

Nuclear Theory

4 pages, ReVTeX, 2 figures in eps, submitted to Phys.Rev.Lett. Updated version: an error in eqn. 4 has been corrected, several

Scientific paper

10.1103/PhysRevLett.82.3396

We investigate the masses of the lowest c\bar{c} states, the J/psi and eta_c, 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 eta_c masses in nuclear matter.

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