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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. Lozano,W. Majid,S. Pislak,A. A. Poblaguev,P. Rehak,A. Sher,J. A. Thompson,P. Truoel,M. E. Zeller

PHYSICAL REVIEW D（2006）

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摘要
Experiment 865 at the Brookhaven AGS has observed the decay K+-> e(+)nu(e)mu(+)mu(-). The branching ratio extracted is (1.72 +/- 0.37(stat)+/- 0.17(syst)+/- 0.19(model))x10(-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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weak interaction
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