Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-03-20
Acta Phys.Polon. B30 (1999) 271-285
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX 16 pages, 1 ps figure
Scientific paper
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.
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