Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-03-09
Phys.Rev.D54:6855-6860,1996
Physics
High Energy Physics
High Energy Physics - Phenomenology
Final version
Scientific paper
10.1103/PhysRevD.54.6855
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.
Flores-Mendieta Ruben
Garcia Arnaldo
Sanchez-Colon Gabriel
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