A Test of the Standard Model, Using Da$Φ$ne

Abstract

Both the light hypernucleus ${}_Λ{\rm H}^4$ and the nucleus ${\rm He}^4$ have spin 0. The ratio $R$ of the electron to muon rates for the pure Fermi transitions \begin{equation} R=\frac{Γ\left({}_Λ{\rm H}^4\rightarrow {\rm e}^- + \bar ν+{\rm He}^4\right)} {Γ\left({}_Λ{\rm H}^4\rightarrow μ^- + \bar ν+{\rm He}^4\right)} \end{equation} is a sensitive measure of the presence of a {\em second-class} weak current (to the extent that SU(3) is valid in strong interactions), and hence, is a test of the Standard Model. Rates and sensitivities, using Da$Φ$ne, the $e^+e^-$ machine under construction at Frascati, are discussed.