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 × 10E−10 and 4.2 × 10E−11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.
Searches for lepton number violating K+ decays
Volpe R.;Anzivino G.;Brizioli F.;Imbergamo E.;Lollini R.;Piandani R.;Santoni C.;Checcucci B.;Piccini M.;
2019
Abstract
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 × 10E−10 and 4.2 × 10E−11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.File in questo prodotto:
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