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J/psi and eta_c in the nuclear medium: QCD sum rule approach | | Frank Klingl
; Sungsik Kim
; Su Houng Lee
; Philippe Morath
; Wolfram Weise
; | | Date: |
20 Nov 1998 | | Journal: | Phys.Rev.Lett. 82 (1999) 3396-3399; Erratum-ibid. 83 (1999) 4224 | | Subject: | nucl-th hep-ph | | Abstract: | We investigate the masses of the lowest car{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. | | Source: | arXiv, nucl-th/9811070 | | Services: | Forum | Review | PDF | Favorites | |
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