Determination of the Kobayashi-Maskawa-Cabibbo matrix elementVusunder various flavor-symmetry-breaking models in hyperon semileptonic decays | Zendy

Rubén FloresMendieta | Zendy; A. García | Zendy; G. Sánchez-Colón | Zendy

Open Access

Determination of the Kobayashi-Maskawa-Cabibbo matrix elementVusunder various flavor-symmetry-breaking models in hyperon semileptonic decays

Author(s) -

Rubén FloresMendieta,

A. García,

G. Sánchez-Colón

Publication year - 1996

Publication title -

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Language(s) - English

Resource type - Journals

eISSN - 1089-4918

pISSN - 0556-2821

DOI - 10.1103/physrevd.54.6855

Subject(s) - physics , particle physics , hyperon , chiral perturbation theory , context (archaeology) , symmetry breaking , order (exchange) , combinatorics , mathematics , hadron , quark , paleontology , finance , economics , biology

We study the success to describe hyperon semileptonic decays of four modelsthat incorporate second-order SU(3) symmetry breaking corrections. The criteriato assess their success is by determining V_{us} in each of the three relevanthyperon semileptonic decays and comparing the values obtained with one anotherand also with the one that comes from K_{l3} decays. A strong dependence on theparticular symmetry breaking model is observed. Values of V_{us} which do notagree with the one of K_{l3} are generally obtained. However, in the context ofchiral perturbation theory, only the model whose corrections are O(m_s) andO(m_s^{3/2}) is successful. Using its predictions for the f_1 form factors onecan 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.Comment: Final versio

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