Searches for lepton number violating K+ -> pi- e+ e+ and K+ -> pi- pi0 e+ e+ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016-2018. Upper limits of 5.3 x 10^(-11 )and 8.5 x 10^(-10) are obtained on the decay branching fractions at 90% confidence level. The former result improves by a factor of four over the previous best limit, while the latter result represents the first limit on the K+ -> pi- pi0 e+ e+ decay rate.
Searches for lepton number violating K+ → π− (π0) e+ e+ decays
R. Arcidiacono;M. Boretto;E. Menichetti;E. Migliore;D. Soldi;R. Guida;
2022-01-01
Abstract
Searches for lepton number violating K+ -> pi- e+ e+ and K+ -> pi- pi0 e+ e+ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016-2018. Upper limits of 5.3 x 10^(-11 )and 8.5 x 10^(-10) are obtained on the decay branching fractions at 90% confidence level. The former result improves by a factor of four over the previous best limit, while the latter result represents the first limit on the K+ -> pi- pi0 e+ e+ decay rate.
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