Measurements of the decay KL→e+e-γ

E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, E. Blucher, G. J. Bock, E. Cheu, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, A. Glazov, A. Golossanov, Y. B. Hsiung, D. A. Jensen, R. Kessler, H. G E Kobrak, K. Kotera, J. Ladue, A. LedovskoyP. L. McBride, E. Monnier, H. Nguyen, R. Niclasen, E. J. Ramberg, R. E. Ray, M. Ronquest, J. Shields, W. Slater, D. Smith, N. Solomey, E. C. Swallow, P. A. Toale, R. Tschirhart, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. J. Wilking, R. Winston, E. T. Worcester, T. Yamanaka, E. D. Zimmerman

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    The E799-II (KTeV) experiment at Fermilab has collected 83262 KL→e+e-γ(γ) events above a background of 79 events. We measure a decay width, normalized to the KL→π0π0πD0 (π0→γ γ, π0→γγ, πD0→e+e-γ(γ)) decay width, of Γ(KL→e+e-γ(γ))/ Γ(KL→π0π0πD0)=(1.3302±0.0046stat±0.0102syst) ×10-3. We also measure parameters of two KLγ*γ form factor models. In the Bergström-Massó-Singer parametrization, we find CαK*=-0.517±0.030stat±0.022syst. We separately fit for the first parameter of the D'Ambrosio-Isidori-Portolés model and find αDIP=-1.729±0.043stat±0.028syst. © 2007 The American Physical Society.
    Original languageEnglish
    Article number051804
    JournalPhysical Review Letters
    Issue number5
    Publication statusPublished - 3 Aug 2007


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