QCD Sum Rules and the Induced Pseudoscalar Coupling
Abstract
We present an extension of the QCD sum rule method in the external fields so as to determine the induced pseudoscalar coupling constant gP, which tests the validity of the partially conserved axial current (PCAC) hypothesis. This is essentially that we pick out the "higher-order" effects of both the hadron and quark (QCD) sides. A specific QCD sum rules for gP is obtained and its prediction is briefly analyzed. It turns out that the final prediction on gP is extremely stable. In view of the versatile nature of the present QCD sum rule methods, we appendix some discussions on the possible future of the method.
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