New QCD Sum Rules for In-Medium Nucleons

Abstract

New QCD sum rules for nucleons in nuclear matter are derived from a mixed correlation function of spin-1/2 and spin-3/2 interpolating fields. These sum rules allow a determination of the scalar self-energy of the nucleon independent of the poorly known four-quark condensates. An analysis of these new sum rules in concert with previous nucleon sum rules from spin-1/2 interpolators indicates consistency with the expectations of relativistic mean-field phenomenology. We find $M^{\ast }=0.68\pm 0.08$ GeV and ${\Sigma }_v=0.31\pm 0.06$ GeV at nuclear matter saturation density.

Invited talk presented at Baryons '95. 5 page RevTeX Manuscript with embedded figures. This and related papers may also be obtained from http://www.phys.washington.edu/~derek/Publications.html