Comment on 'Induced Pseudoscalar Coupling Constant' by Il-Tong Cheon and Myung Ki Cheoun (nucl-th/9811009)
Harold W. Fearing, TRIUMF
Abstract
In a recent preprint Cheon and Cheoun have derived from a chiral model an additional term, not usually appearing in the standard matrix element for radiative muon capture. Using that term they generate a large correction to the RMC spectrum which tends to resolve the problem caused by the too large value of gP found in the TRIUMF RMC experiment. In this comment we observe first that their extra term leads to an amplitude which is not gauge invariant and second that such a term should be present, in a gauge invariant way, in an earlier full chiral perturbation theory calculation, which however found negligible differences from the standard approach.
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