J/psi and eta_c in the nuclear medium: QCD sum rule approach
Nuclear Theory
2011-09-29 v2 High Energy Physics - Phenomenology
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.
Cite
@article{arxiv.nucl-th/9811070,
title = {J/psi and eta_c in the nuclear medium: QCD sum rule approach},
author = {Frank Klingl and Sungsik Kim and Su Houng Lee and Philippe Morath and Wolfram Weise},
journal= {arXiv preprint arXiv:nucl-th/9811070},
year = {2011}
}
Comments
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