Sign convention of residues in QCD sum rules
نویسنده
چکیده
where |N(q)〉 is a one-nucleon state with four-momentum q and u(q) is a Dirac spinor for the nucleon. λN is the coupling strength which measures the ability of the interpolating field ηN to excite the nucleon from the QCD vacuum. In fact, the above interpolating field couples to the negative parity nucleons also. Recently, the techniques to study negative parity baryons are given in Ref. and Ref., respectively. In general, the interpolating fields for octet baryons are expressed as a combination of two fields such as 7 O 1 = ǫabc [
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