Hyperon semileptonic decays in QCD sum rules

Abstract

We investigate the hyperon semileptonic decays within the framework of QCD sum rules. The flavor $SU(3)$ symmetry breaking effects are analyzed via the relevant form factors and corresponding branching fractions. Employing the $z$-series parameterization to capture the $q^2$ dependence of form factors, we calculate the hyperon semileptonic decay rates and confront them with the recent experimental measurements. Moreover, we calculate as well the non-standard tensor form factors, which involve certain new physics beyond the standard model.

Comments: 18 pages, 2 figures