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

doi:10.1103/PhysRevD.73.037101

paper

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

arXiv:hep-ex/0505011 · doi:10.1103/PhysRevD.73.037101

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.

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