Modification of nucleon spectral function in nuclear matter from QCD sum rules

in-medium spectral functions of the nucleon and its negative parity excited state in nuclear matter are investigated from QCD sum rules with the maximum entropy method (MEM). We construct the parity projected in-medium nucleon QM sum rule with all known first-order cs, corrections to the Wilson coefficients of the operator product expansion (OPE). It is found that the quark condensate <(q) over barq > and Vector quark condensate < q(dagger)q > have dominant contributions and thus the in-medium behaviors of both positive and negative parity states are strongly affected by the density dependencies of these condensates. The density dependencies of the effective masses and vector self-energies are also examined