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We present a measurement of the K–π vector current form-factor parameters for the decay KL→π±e∓ν. We use 328 pb −1 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 IKe needed to measure the CKM matrix...
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