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

Abstract

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.

14 pages, 4 figures

Cited by in corpus (8)

• Kaon Decays in the Standard Model
• Triple product asymmetries in K, D_(s) and B_(s) decays
• The radiative corrections to double-Dalitz decays revisited
• Radiative Corrections to Double Dalitz Decays: Effects on Invariant Mass Distributions and Angular Correlations
• Measurements of the Decay KL->e+e-mu+mu-
• New Physics Searches at Kaon and Hyperon Factories
• Lepton pair decays of the $K_L$ meson in the light-front model
• Experimental results on $K_L$ decays