NEGATIVE-PARITY BARYONS IN THE QCD SUM-RULE

Masses and couplings of negative parity baryons are studied in the QCD sum rule, A technique to single out tile negative-parity spectrum is proposed. The quark condensates that break the chiral symmetry cause m ass splittings between the ground state and negative parity baryons, s uggesting that they form parity doublet. (In the flavor singlet spectr a the negative parity baryon is the lowest state.) We also compute the pi NN coupling and found that it vanishes in the soft pion limit due to the chiral structure of the interpolating field.