QCD sum rules for rho mesons in nuclear matter - art. no. 065204

We investigate QCD sum rules for vector currents in the rho meson channel i n the nuclear medium. For increased sensitivity, we subtract out the vacuum contributions. With a saturation scheme often considered in the literature , we find these "subtracted" sum rules to be unstable. It indicates the imp ortance of other contributions neglected in the saturation scheme. These in clude more Landau singularities at low energy, additional operators in the medium, and possibly the in-medium width of the rho meson.