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

1998/11/30 by Frank Klingl, Sungsik Kim, Su Houng Lee +2 · 1 citation
Physics and Astronomy · #nucl-th #hep-ph

paper · pdf · doi:10.1103/physrevlett.82.3396

published as Phys.Rev.Lett.82:3396-3399,1999; Erratum-ibid.83:4224,1999 · 4 pages, ReVTeX, 2 figures in eps, submitted to Phys.Rev.Lett. Updated version: an error in eqn. 4 has been corrected, several references have been added, figures have been revised

arxiv created 1998/12/01 · arxiv updated 2011/09/29

Abstract

We investigate the masses of the lowest cc 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.

Cited by

• Open-Charm Vector Mesons in Hot and Dense Nuclear Matter