The Value of the Kobayashi-Maskawa-Cabibbo matrix element V(us) and flavor symmetry breaking in hyperon semileptonic decays
May 13, 199116 pages
Published in:
- Phys.Rev.D 45 (1992) 879-883
Report number:
- PRINT-91-0188 (MEXICO)
Citations per year
Abstract: (APS)
We perform a detailed model-independent analysis of the determination of Vus in the ΔS=1 decays Λ→peν, Σ−→neν, and Ξ−→Λeν. Values systematically higher than the Ke3 one are obtained. A reconciliation may be only obtained through second-order changes of a few percent in the leading vector form factors f1, provided that these changes always increase their magnitudes over their conserved vector current (CVC) predictions. Using the CVC or the recoil part of recent flavor-symmetry-breaking calculations, the value Vus=0.2558±0.0027 is obtained, which is higher than the Ke3 one by 2.6 standard deviations.- Lambda: semileptonic decay
- semileptonic decay: Lambda
- Sigma-: semileptonic decay
- semileptonic decay: Sigma-
- Xi-: semileptonic decay
- semileptonic decay: Xi-
- K: semileptonic decay
- semileptonic decay: K
- CKM matrix matrix
- symmetry breaking: SU(3)
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