Determination of the Kobayashi-Maskawa-Cabibbo matrix element V(us) under various flavor symmetry breaking models in hyperon semileptonic decays
Mar, 199613 pages
Published in:
- Phys.Rev.D 54 (1996) 6855-6860
e-Print:
- hep-ph/9603256 [hep-ph]
Report number:
- DP-5687
Citations per year
Abstract:
We study the success to describe hyperon semileptonic decays of four models that incorporate second-order SU(3) symmetry breaking corrections. The criteria to assess their success is by determining V_{us} in each of the three relevant hyperon semileptonic decays and comparing the values obtained with one another and also with the one that comes from K_{l3} decays. A strong dependence on the particular symmetry breaking model is observed. Values of V_{us} which do not agree with the one of K_{l3} are generally obtained. However, in the context of chiral perturbation theory, only the model whose corrections are O(m_s) and O(m_s^{3/2}) is successful. Using its predictions for the f_1 form factors one can quote a value of V_{us} from this model, namely, V_{us}=0.2176\pm 0.0026, which is in excellent agreement with the K_{l3} one.- 12.15.Ji
- 12.15.Hh
- 13.30.Ce
- hyperon: semileptonic decay
- semileptonic decay: hyperon
- Kobayashi-Maskawa angle
- quark: up
- quark: strangeness
- symmetry breaking: flavor
- symmetry breaking: SU(3)
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