An Improved Limit on the Rate Of Decay K+ -> pi+ mu+ e-
R.Appel, G.S.Atoyan, B.Bassalleck, D.R.Bergman, D.N.Brown, N.Cheung,, S.Dhawan, H.Do, J.Egger, S.Eilerts, C.Felder, H.Fischer, M.Gach, W.Herold,, V.V.Issakov, H.Kaspar, D.E.Kraus, D.M.Lazarus, L.Leipuner, P.Lichard, J.Lowe,, J.Lozano, H.Ma, W.Majid, W.Menzel, S.Pislak
TL;DR
This paper reports new upper limits on the rare decay rates of K+ -> pi+ mu+ e- and pi0 -> mu+ e-, significantly constraining possible new physics beyond the Standard Model.
Contribution
The experiment E865 at BNL provides the most stringent upper limits to date on these rare decay processes, improving previous bounds.
Findings
Upper limit on K+ -> pi+ mu+ e- branching ratio: 3.9x10^-11
Combined upper limit on K+ -> pi+ mu+ e-: 2.8x10^-11
Upper limit on pi0 -> mu+ e-: 3.8x10^-10
Abstract
The experiment E865 at BNL places an upper limit on the branching ratio for the decay K+ -> pi+ mu+ e- of 3.9x10^-11 (90% C.L.). Along with with other results this yields a combined upper limit on this branching ratio of 2.8x10^-11. A new upper limit on the branching ratio for pi0 -> mu+ e- of 3.8x10^-10 (90% C.L.) is also established. The experiment and analysis are described.
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