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.

Original languageEnglish (US)
Article number051804
JournalPhysical review letters
Issue number5
StatePublished - Aug 3 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Blucher, E., Bock, G. J., Cheu, E., Coleman, R., Corcoran, M. D., Cox, B., Erwin, A. R., Glazov, A., Golossanov, A., Hsiung, Y. B., Jensen, D. A., Kessler, R., Kobrak, H. G. E., Kotera, K., Ladue, J., ... Zimmerman, E. D. (2007). Measurements of the decay KL→e+e-γ. Physical review letters, 99(5), [051804].