Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-05-07
Phys.Rev.Lett. 85 (2000) 3576-3579
Physics
Nuclear Physics
Nuclear Theory
4 pages, 3 figures; typos corrected; references updated; some rewording; conclusions unchanged
Scientific paper
10.1103/PhysRevLett.85.3576
The relevance of the axial current for pion production processes off the nucleon with real or virtual photons is revisited. Employing the hypothesis of a partially conserved axial current (PCAC), it is shown that, when all of the relevant contributions are taken into account, PCAC does not provide any additional constraint for threshold production processes that goes beyond the Goldberger-Treiman relation. In particular, it is shown that pion electroproduction processes at threshold cannot be used to extract any information regarding the weak axial form factor. The relationships found in previous investigations are seen to be an accident of the approximations usually made in this context.
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