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

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

2005-02-09

arxiv.org/abs/hep-ex/0502020v3

Phys.Rev.D72:012005,2005

Physics

High Energy Physics

High Energy Physics - Experiment

v2: 13 pages, submitted to the Phys. Rev. D v3: 13 pages, resubmitted to Phys. Rev. D (corrections include: a more detailed ov

Scientific paper

10.1103/PhysRevD.72.012005

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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