First Evidence for the Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi>L</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>
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説明
We present the first evidence for the decay {ital K}{sub {ital L}}{r_arrow}{ital e}{sup +}{ital e}{sup {minus}}{mu}{sup +}{mu}{sup {minus}} based on the observation of one event with an estimated background of 0.067{sub {minus}0.025}{sup +0.057} event. We determine the branching ratio to be {ital B}({ital K}{sub {ital L}}{r_arrow}{ital e}{sup +}{ital e}{sup {minus}}{mu}{sup +}{mu}{sup {minus}})=(2.9{sub {minus}2.4}{sup +6.7}){times}10{sup {minus}9}. In addition, we set a 90{percent} confidence upper limit on the combined branching ratio for the lepton flavor violating decays {ital K}{sub {ital L}}{r_arrow}{ital e}{sup {minus_plus}}{ital e}{sup {minus_plus}}{mu}{sup {plus_minus}}{mu}{sup {plus_minus}} to be {ital B}({ital K}{sub {ital L}}{r_arrow}{ital e}{sup {minus_plus}}{ital e}{sup {minus_plus}}{mu}{sup {plus_minus}}{mu}{sup {plus_minus}}){lt}6.1{times}10{sup {minus}9} assuming a uniform phase space distribution. {copyright} {ital 1996 The American Physical Society.}
収録刊行物
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- Physical Review Letters
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Physical Review Letters 76 4312-4315, 1996-06-03
American Physical Society (APS)
