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The NA62 Collaboration; Cortina Gil, Eduardo; Husek, Tomas | |||
Aquest document és un/a article, creat/da en: 2019 | |||
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The NA62 experiment at CERN reports a search for the lepton number violating decays K+→π−e+e+ and K+→π−μ+μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2 x 10^-10 and 4.2 x 10^-11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively. | |||
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