QCD Sum Rules and the Nucleon Structure
In this talk, I wish to describe the method of QCD sum rules as a means of taking into account strong interaction effects in physical phenomena in which strong interactions, as described by quantum chromodynamics (QCD) among quarks and gluons, play an important role. The determination of the isovector and isoscalar axial coupling constants, g A and g A S , via the method of QCD sum rules is used to illustrate the method. The determination of the neutron-proton mass difference from the method serves as another interesting example. Our present efforts focus on the possibility of employing the method to treat nonleptonic weak interaction problems, including parity-violating πNN, ρNN, and ωNN couplings, decays of heavy mesons or of heavy baryons, etc. Throughout the present talk, I shall discuss primarily the issues related to the nucleon structure.
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