Weak Radiative Hyperon Decays and Vector Meson Dominance

Details Weak Radiative Hyperon Decays and Vector Meson Dominance Weak Radiative Hyperon Decays and Vector Meson Dominance

1998-10-13

arxiv.org/abs/hep-ph/9810337v1

Nucl.Phys.Proc.Suppl. 75B (1999) 53-56

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at 3rd International Conference on Hyperons, Charm and Beauty Hadrons, Genoa, Italy, 30 Jun - 3 Jul 1998; To appear

Scientific paper

10.1016/S0920-5632(99)00323-0

We study the question whether the phenomenologically successful VMD approach to weak radiative hyperon decays can be made consistent with Hara's theorem and still yield the pattern of asymmetries exhibited by experimental data. It appears that an essential ingredient which governs the pattern of asymmetries is the off-shell behaviour of the input electromagnetic 1/2^- 1/2^+ \gamma couplings. Although this behaviour can be chosen in such a way that the experimentally observed pattern is obtained, and yet Hara's theorem satisfied, at the same time the approach yields a definite prediction for the size of weak meson-nucleon coupling constants. Comparison with experiment reveals then another conflict.

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