Determination of the Kobayashi-Maskawa-Cabibbo matrix element V_{us} under various flavor-symmetry-breaking models in hyperon semileptonic decays

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.

Final version

References in corpus (3)

• SU(3) Breaking Effects in Hyperon Semi-Leptonic Decays and the extraction of F and D
• Beta decay of hyperons in a relativistic quark model
• Chiral Corrections to Hyperon Vector Form Factors

Cited by in corpus (10)

• CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories
• Semileptonic Hyperon Decays
• SU(3) symmetry breaking in hyperon semileptonic decays
• Semileptonic Hyperon Decays and CKM Unitarity
• V_{us} from hyperon semileptonic decays
• Present knowledge of the Cabibbo-Kobayashi-Maskawa matrix
• Measurement of the branching ratios of the decays Xi0 --> Sigma+ e- nubar and anti-Xi0 --> anti-Sigma+ e+ nu
• Updating V_us from kaon semileptonic decays
• Chiral corrections to the vector and axial couplings of quarks and baryons
• Measurement of the branching ratio of the decay ${\Xi }^0\to {\Sigma }^{+}{\mu }^{-}{\bar{\nu }}_{\mu }$