arXiv:nucl-th/9506025·v1·Nuclear Theory
Analysis of the Low-Energy Theorem for \gamma p \to p \pi^0
H.W.L. Naus (Institute for Theoretical Physics, University of Heidelberg, Heidelberg, Germany)🇩🇪 · R.M. Davidson (National Institute for Nuclear Physics and High Energy Physics, Amsterdam, The Netherlands)🇳🇱
Abstract
The derivation of the `classical' low-energy theorem (LET) for \gamma p \rightarrow p\pi^0 is re-examined and compared to chiral perturbation theory. Both results are correct and are not contradictory; they differ because different expansions of the same quantity are involved. Possible modifications of the extended partially conserved axial-vector current relation, one of the starting points in the derivation of the LET, are discussed. An alternate, more transparent form of the LET is presented.
Comments: 5 pages, Revtex, no figures, no tables