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arxiv: hep-ex/0502020 · v3 · submitted 2005-02-09 · ✦ hep-ex

An Improved upper limit on the decay K^+ -> pi^+ mu^+ e^-

Aleksey Sher , R. Appel , G.S. Atoyan , B. Bassalleck , D.R. Bergman , N. Cheung , S. Dhawan , H. Do
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J. Egger S. Eilerts W. Harold V.V. Issakov H. Kaspar D.E. Kraus D.M. Lazarus P. Lichard J. Lowe J. Lozano H. Ma W. Majid S. Pislak A.A. Poblaguev P. Rehak A. Sher J.A. Thompson P. Truoel M.E. Zeller
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keywords limitupperbranchingdatadecaye865experimentratio
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Based on results of a search for the lepton-family-number-violating decay $K^+ \to \pi^+\mu^+ e^-$ with data collected by experiment E865 at the Alternating Gradient Synchrotron of Brookhaven National Laboratory, we place an upper limit on the branching ratio at $2.1 \times 10^{-11}$ (90% C.L.). Combining the results with earlier E865 data and those of a previous experiment, E777, an upper limit on the branching ratio of $1.3 \times 10^{-11}$ (90% C.L.) is obtained.

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