Observation of the Decay ${\ensuremath{\Xi}}^{0}\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$

Observation of the Decay $Ξ^{0} \to Σ^{+} μ^{-} {\bar{ν}}_{μ}$

E. Abouzaid et al. (KTeV Collaboration)

Phys. Rev. Lett. 95, 081801 – Published 19 August 2005

Abstract

The $Ξ^{0}$ muon semileptonic decay has been observed for the first time with nine identified events using the KTeV beam line and detector at Fermilab. The decay is normalized to the $Ξ^{0}$ beta decay mode and yields a value for the ratio of decay rates $Γ (Ξ^{0} \to Σ^{+} μ^{-} {\bar{ν}}_{μ}) / Γ (Ξ^{0} \to Σ^{+} e^{-} {\bar{ν}}_{e})$ of $[{1.8}_{- 0.5}^{+ 0.7} (stat) \pm 0.2 (syst)] \times 10^{- 2}$ . This is in agreement with the SU(3) flavor symmetric quark model.