Searches for the lepton number violating K+ → π−μ+e+ decay and lepton flavour violating decays K+ → π+μ−e+ and π0 → μ−e+ are reported, using NA62 data collected in 2017 and 2018. In the absence of a significant excess above the background in each channel, upper limits on the branching ratios are established at 90% confidence level: B(K+ → π−μ+e+) < 4.2 × 10−11, B(K+ → π+μ−e+) < 6.6 × 10−11, and B(π0 → μ−e+) < 3.2 × 10−10
Searches for lepton flavour/number violation in K+ and π0 decays at the NA62 experiment / Swallow J., Akmete A., Aliberti R., Ambrosino F., Ammendola R., Angelucci B., Antonelli A., Anzivino G., Arcidiacono R., Bache T., Baeva A., Baigarashev D., Bandiera L., Barbanera M., Bernhard J., Biagioni A., Bician L., Biino C., Bizzeti A., Blazek T., et al.. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - ELETTRONICO. - 402:(2022), pp. 0-0. (22nd International Workshop on Neutrinos from Accelerators, NuFact 2021 ita 2021).
Searches for lepton flavour/number violation in K+ and π0 decays at the NA62 experiment
Bizzeti A.
;Bucci F.
;Iacopini E.
;Latino G.
;Lenti M.
;Marchevski R.
;Panichi I.
;Ruggiero G.
;Turisini M.
;Volpe R.
;
2022
Abstract
Searches for the lepton number violating K+ → π−μ+e+ decay and lepton flavour violating decays K+ → π+μ−e+ and π0 → μ−e+ are reported, using NA62 data collected in 2017 and 2018. In the absence of a significant excess above the background in each channel, upper limits on the branching ratios are established at 90% confidence level: B(K+ → π−μ+e+) < 4.2 × 10−11, B(K+ → π+μ−e+) < 6.6 × 10−11, and B(π0 → μ−e+) < 3.2 × 10−10
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