First observation of the decay K+ -> e+ nu mu+ mu-

Ma, H.; Appel, R.; Atoyan, G. S.; Bassalleck, B.; Bergman, D. R.; Cheung, N.; Dhawan, S.; Do, H.; Egger, J.; Eilerts, S.; Herold, W.; Issakov, V. V.; Kaspar, H.; Kraus, D. E.; Lazarus, D. M.; Lichard, P.; Lowe, J.; Lozano, J.; Majid, W.; Pislak, S.; Poblaguev, A. A.; Rehak, P.; Sher, A.; Thompson, J. A.; Truoel, P.; Zeller, M. E.

First observation of the decay K+ -> e+ nu mu+ mu-

Authors

Description

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.
4 pages, 6 figures, Revtex4. Correction to figure and minor text changes