Measurements of the rare decay K_{L} -> e^{+} e^{-} e^{+} e^{-}
High Energy Physics - Experiment
2010-05-28 v1
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.
Cite
@article{arxiv.hep-ex/0104043,
title = {Measurements of the rare decay K_{L} -> e^{+} e^{-} e^{+} e^{-}},
author = {The KTeV Collaboration and A. Alavi-Harati},
journal= {arXiv preprint arXiv:hep-ex/0104043},
year = {2010}
}
Comments
14 pages, 4 figures