Extraction of the CKM matrix element V-us from the hyperon semileptonic decays

作者：Sharma N^*; Dahiya H; Chatley P K

来源：European Physical Journal A, 2010, 44(1): 125-128.

DOI：10.1140/epja/i2010-10942-x

The chiral constituent quark model with configuration mixing (chi CQM(config)), which is successful in explaining the weak vector and axial-vector form factors for the strangeness-changing as well as strangeness-nonchanging hyperon semileptonic decays at Q(2) = 0, has been extended to determine the CKM matrix element V-us for the strangeness-changing decays. The implications of the effect of the SU(3) symmetry breaking, Q(2)-dependence and radiative corrections on the form factors and V-us have also been investigated. It is found that the results with SU(3) symmetry breaking show considerable improvement over the SU(3) symmetric results when compared with the existing experimental data. The inclusion of the Q(2)-dependence and radiative corrections in form factors have only a small effect on the prediction of Vus as is expected from the theory.

• 出版日期2010-4