First observation of the isospin violating decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:mo>→</mml:mo><mml:mi mathvariant="italic">Λ</mml:mi><mml:msup><mml:mover accent="true"><mml:mi mathvariant="italic">Σ</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup><mml:mo>+</mml:mo><mml:mi mathvariant="normal">c</mml:mi><mml:mo>.</mml:mo><mml:mi mathvariant="normal">c</mml:mi><mml:mo>.</mml:mo></mml:math>

F. Feldbauer, D. Ambrose, F. F. An et al.|Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields|2012

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