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arxiv: hep-ph/0610191 · v1 · submitted 2006-10-16 · ✦ hep-ph

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Radiative and nonleptonic hyperon decays in broken SU(3)

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classification ✦ hep-ph
keywords parity-violatingamplitudesdecaysdescriptionhyperonlargenlhdnonleptonic
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We report on the recently proposed joint resolution of two long-standing puzzles in weak radiative (WR) and nonleptonic (NL) hyperon decays (HD). First, a good VMD-based description of WRHD is presented. In particular, the large negative asymmetry observed in the \Sigma^+ \to p \gamma decay is explained through a calculably large SU(3)-breaking effect in the relevant parity-violating amplitude. Second, the achieved description of the parity-violating WRHD amplitudes permits the extraction, via the SU(2)_W + VMD route, of the non-soft-pion correction term in the parity-violating NLHD amplitudes. The latter subtracts a substantial amount from the current-algebra commutator term, thus leading to the resolution of the old S:P discrepancy in NLHD.

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