1998/03/20 by P. Zenczykowski
Physics and Astronomy · #hep-ph
published as Acta Phys.Polon. B30 (1999) 271-285 · LaTeX 16 pages, 1 ps figure
arxiv created 1998/03/20 · arxiv updated 2009/11/30
We study the question whether the pole-model VMD approach to weak radiative hyperon decays can be made consistent with Hara's theorem and still yield the pattern of asymmetries characteristic of the quark model. It is found that an essential ingredient which governs the pattern of asymmetries is the assumed off-shell behaviour of the parity-conserving 1/2- 1/2+ gamma amplitudes. It appears that this behaviour can be chosen in such a way that the pattern characteristic of the quark model is obtained, and yet Hara's theorem satisfied. As a byproduct, however, all parity-violating amplitudes in weak radiative and nonleptonic hyperon decays must then vanish in the SU(3) limit. This is in conflict with the observed size of weak meson-nucleon couplings.