A search for the lepton number violating K+ ? p-µ+e+ and lepton flavour violating K+ ? p-µ-e+ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90% confidence level: B(K+ ? p-µ+e+) < 4.2 × 10-11 and B(K+ ? p+µ-e+) < 6.6 × 10-11. These results improve over the previous limits by factors of 12 and 8 respectively.
Searches for lepton flavour and lepton number violation in K+ decays at NA62
Anzivino G.;Barbanera M.;Brizioli F.;Checcucci B.;Imbergamo E.;Lollini R.;Lupi M.;Piandani R.;Santoni C.;Volpe R.;
2021
Abstract
A search for the lepton number violating K+ ? p-µ+e+ and lepton flavour violating K+ ? p-µ-e+ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90% confidence level: B(K+ ? p-µ+e+) < 4.2 × 10-11 and B(K+ ? p+µ-e+) < 6.6 × 10-11. These results improve over the previous limits by factors of 12 and 8 respectively.File in questo prodotto:
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