First measurement of branching ratio and g(1)/f(1) of the neutral cascade hyperon using final state polarization

摘要

The KTeV collaboration has made a first observation of neutral cascade beta decay (Xi(0) --> Sigma(+) e(-)<(nu)over bar>). We present measurements of the branching ratio and form factors for this semi leptonic process. The results agree well with the Cabibbo SU(3)(f) theory and do not favor attempts to include symmetry breaking effects. [References: None]