Phys. Rev. Lett. 99, 051804 (2007) [5 pages]Measurements of the Decay KL→e+e-γReceived 23 February 2007; published 3 August 2007 The E799-II (KTeV) experiment at Fermilab has collected 83 262 KL→e+e-γ(γ) events above a background of 79 events. We measure a decay width, normalized to the KL→π0π0πD0 (π0→γγ, 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 URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.051804
DOI:
10.1103/PhysRevLett.99.051804
PACS:
13.20.Eb, 14.40.Aq
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