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

Frank Klingl, Sungsik Kim, Su Houng Lee, Philippe Morath, Wolfram Weise

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Abstract

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.

Original languageEnglish
Pages (from-to)3396-3399
Number of pages4
JournalPhysical Review Letters
Volume82
Issue number17
DOIs
Publication statusPublished - 1999 Jan 1

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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