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The Xi^0 muon semi-leptonic decay has been observed for the first time withnine identified events using the KTeV beam line and detector at Fermilab. Thedecay is normalized to the Xi^0 beta decay mode and yields a value for theratio of decay rates of $(1.8^{+0.7}_{-0.5}(stat.)\pm0.2(syst.))\times10^{-2}$. This is in agreement with the SU(3) flavor symmetric quark model.

physical review letters

Observation of the Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Ξ</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>Σ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msub><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>μ</mml:mi></mml:msub></mml:math>

Observation of the DecayΞ0→Σ+μ−ν¯μ