NEW QCD SUM-RULES FOR NUCLEONS IN NUCLEAR-MATTER

Two new QCD sum rules for nucleons in nuclear matter are obtained from a mixed correlator of spin-1/2 and spin-3/2 interpolating fields, The se new sum rules, which are insensitive to the poorly known four-quark condensates, provide additional information on the nucleon scalar sel f-energy, They are analyzed along with previous spin-1/2 interpolator- based sum rules which are also insensitive to the poorly known four-qu ark condensates. The analysis indicates consistency with the expectati ons of relativistic nuclear phenomenology at nuclear matter saturation density. However, a weaker density dependence near saturation is sugg ested, Using previous estimates of in-medium condensate uncertainties, we find M = 0.64(-0.09)(+0.13) GeV and Sigma(upsilon) = 0.29(-0.10)( +0.06) GeV at nuclear matter saturation density.