QCD SUM-RULES FOR NUCLEONS IN NUCLEAR-MATTER-III

The self-energies of quasinucleon states in nuclear matter are investi gated using a finite-density QCD sum-rule approach developed previousl y. The sum rules are obtained for a general QCD interpolating field fo r the nucleon. The key phenomenological inputs are the nucleon sigma t erm, the strangeness content of the nucleon, and quark and gluon distr ibution functions deduced from deep-inelastic scattering. The emphasis is on testing the sensitivity and stability of sum-rule predictions t o variations of the condensates and other input parameters. At nuclear matter saturation density, the Lorentz vector self-energy is found to be positive with a magnitude of a few hundred MeV, which is comparabl e to that suggested by relativistic nuclear phenomenology This result is quite stable. The prediction for the scalar self-energy is very sen sitive to the undetermined values of the in-medium four-quark condensa tes.