Measurements of the rare decay K_{L} -> e^{+} e^{-} e^{+} e^{-}

Details Measurements of the rare decay K_{L} -> e^{+} e^{-} e^{+} e^{-} Measurements of the rare decay K_{L} -> e^{+} e^{-} e^{+} e^{-}

2001-04-24

arxiv.org/abs/hep-ex/0104043v1

Phys.Rev.Lett.86:5425-5429,2001

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.86.5425

We observe 441 K_{L} -> e^{+} e^{-} e^{+} e^{-} candidate events with a background of 4.2 events and measure B(K_{L} -> e^{+} e^{-} e^{+} e^{-}) = (3.72 \pm 0.18(stat) \pm 0.23(syst)) \times 10^{-8} in the KTeV/E799II experiment at Fermilab. Using the distribution of the angle between the planes of the e^{+} e^{-} pairs, we measure the CP parameters beta_{CP} = -0.23 \pm 0.09(stat) \pm 0.02(syst) and gamma_{CP} = -0.09 \pm 0.09(stat) \pm 0.02(syst). We also present the first detailed study of the e^{+} e^{-} invariant mass spectrum in this decay mode.

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