Hyperon Beta-Decay Analysis and the Recent KTeV Data

Details Hyperon Beta-Decay Analysis and the Recent KTeV Data Hyperon Beta-Decay Analysis and the Recent KTeV Data

2000-12-12

arxiv.org/abs/hep-ph/0012133v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, uses aipproc.cls, aipproc.sty (included), axodraw.sty, cite.sty. Presented at SPIN 2000 (Osaka, Oct. 2000)

Scientific paper

10.1063/1.1384080

The analysis of hyperon semi-leptonic decay data is addressed with reference to SU(3) breaking and isospin mixing between Lambda^O and Sigma^O. Various approaches to SU(3) breaking are discussed and compared. The phenomenological implications of Lambda^0-Sigma^0 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 Xi^0O -> 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 V_us are considered.

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