Rho meson properties in nuclear matter from QCD sum rules

Abstract

We study the properties of rho mesons in nuclear matter by means of QCD sum rules at finite density. For increased sensitivity, we subtract out the vacuum contributions. With the spectral function as estimated in the literature, these subtracted sum rules are found to be not well satisfied. We suppose that Landau singularities from higher resonance states in the nearby region in this channel are the cause for this failure.

Comments: 5 pages including 1 figure, Latex, uses sprocl.sty, psfig; Presented at the Conference on Strong and Electroweak Matter (SEWM 2000), Marseille, France, 14-17 June 2000