Phys. Rev. Lett. 95, 081801 (2005) [4 pages]Observation of the Decay Ξ0→Σ+μ-ν̅ μReceived 25 April 2005; published 19 August 2005 The Ξ0 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 Ξ0 beta decay mode and yields a value for the ratio of decay rates Γ(Ξ0→Σ+μ-ν̅ μ)/Γ(Ξ0→Σ+e-ν̅ e) of [1.8-0.5+0.7(stat)±0.2(syst)]×10-2. This is in agreement with the SU(3) flavor symmetric quark model. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.081801
DOI:
10.1103/PhysRevLett.95.081801
PACS:
13.30.Ce, 14.20.Jn
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