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Study of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>K</mml:mi><mml:mi>L</mml:mi></mml:msub><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mi>ν</mml:mi><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover></mml:math> Decay at the J-PARC KOTO Experiment
The KOTO collaboration has now carefully analyzed widely discussed preliminary data containing four signal events for a rare kaon decay---an excess suggesting physics beyond the Standard Model---and found that Standard Model background events are large enough to explain the signal.