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

Abstract

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.

v2: 13 pages, submitted to the Phys. Rev. D v3: 13 pages, resubmitted to Phys. Rev. D (corrections include: a more detailed overview of the combined analysis of the available experimntal data)

References in corpus (2)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• An Improved Limit on the Rate Of Decay K+ -> pi+ mu+ e-

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