First observation of the decay K+ -> e+ nu mu+ mu-
H.Ma, R. Appel, G.S. Atoyan, B. Bassalleck, D.R. Bergman, N. Cheung,, S. Dhawan, H. Do, J. Egger, S. Eilerts, W. Herold, V.V. Issakov, H. Kaspar,, D.E. Kraus, D.M. Lazarus, P. Lichard, J. Lowe, J. Lozano, W. Majid, S., Pislak, A.A. Poblaguev, P. Rehak, A. Sher, J.A. Thompson
TL;DR
This paper reports the first observation of the rare decay K+ -> e+ nu mu+ mu- with a measured branching ratio, providing new experimental data on kaon decay modes.
Contribution
It presents the first experimental observation and measurement of the decay K+ -> e+ nu mu+ mu-, including a detailed branching ratio estimate.
Findings
Branching ratio: (1.72 +/- 0.37 +/- 0.17 +/- 0.19) x 10^{-8}
First observation of this decay mode
Quantitative analysis of background and model dependence
Abstract
Experiment 865 at the Brookhaven AGS has observed the decay K^+ -> e^+ nu mu^+ mu^-. The branching ratio extracted is (1.72 +/- 0.37(stat) +/- 0.17(syst) +/- 0.19(model)) x 10^{-8} where the third term in the error results from the use of a model to extrapolate into a kinematic region dominated by background.
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