Ja n 20 06 Measurement of the Form-Factor Slopes for the Decay K L → π ± e ∓ ν with the KLOE Detector The KLOE Collaboration
semanticscholar(2008)
Abstract
We present a measurement of the K-π vector current form-factor parameters for the decay KL → πeν. We use 328 pb of data collected in 2001 and 2002, corresponding to ∼ 2 million Ke3 events. Measurements of semileptonic form factors provide information about the dynamics of the strong interaction and are necessary for evaluation of the phase-space integral Ie K needed to measure the CKM matrix element |Vus| for KL → πeν decays. Our result is λ+ = (28.6 ± 0.5 ± 0.4)10 for a linear fit, and λ+ = (25.5 ± 1.5 ± 1.0)10, λ + = (1.4 ± 0.7 ± 0.4)10 for a quadratic fit. key words: ke3 form factor PACS: 13.20.Eb
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