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

A.A. Poblaguev; A. Sher; B. Bassalleck; D.E. Kraus; D.M. Lazarus; D.R. Bergman; G.S. Atoyan; H. Do; H. Kaspar; H.Ma

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

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arxiv hep-ex/0505011 v3 pith:GUNW2XON submitted 2005-05-06 hep-ex

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

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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 (E865 collaboration)

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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.

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Rare kaon decays $K^- \to \ell^- \bar{\nu}_\ell \ell'^{+} \ell'^{-}$: Standard Model predictions from lattice QCD
hep-ph 2026-05 conditional novelty 7.0

Lattice QCD supplies Standard Model branching-fraction predictions for all four K to l nu l' l' channels with controlled uncertainties of 2-7 percent, consistent with published data and preliminary NA62 results.