Hyperon Beta-Decay Analysis and the Recent KTeV Data
Philip G. Ratcliffe
Abstract
The analysis of hyperon semi-leptonic decay data is addressed with reference to SU(3) breaking and isospin mixing between LambdaO and SigmaO. Various approaches to SU(3) breaking are discussed and compared. The phenomenological implications of Lambda0-Sigma0 mixing are not to be underestimated: it can induce vector couplings in decays otherwise purely axial and may also modify rates. In regard of the KTeV data on Xi0O -> Sigma+ e antineutrino, predictions are presented and the impact of present a future data on the extraction of F and D is also examined. In addition, the implications of the new data for the use of octet baryon beta decays in determining Vus are considered.
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