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, P. Truoel, M. E. Zeller
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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