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QCD Sum Rules and Couplings of the Nucleon to Axial Fields?

並列摘要


We describe the method of QCD sum rules, using calculation of the couplings of the nucleon to axial fields as an illustrative example. Our interest is centered about the behavior of a system of quarks, antiquarks, and gluons under the influence of an external field, leading to a modified version of the method of QCD sum rules. In particular, the isovector axial coupling constant go is determined from a QCD sum rule for (gA-l), and it is shown that, with standard values of the quark condensates, gA=1.26±0.08. A sum rule is also obtained for the ”isoscalar” axial coupling constant gA^s, which is found to be 0.13 if the isovector values of susceptibilities are used.

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