Measurement of the Form-Factor Slopes for the Decay KLe3 with the KLOE Detector

Abstract

We present a measurement of the K-pi vector current form-factor parameters for the Ke3 decay. We use 328 pb${}^{-1}$ of data collected in 2001 and 2002, corresponding to about 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 Ke3 decays. Our result is $l=(28.6\pm 0.5\pm 0.4)10^{-3}$ for a linear fit, and $l^{\prime }=(25.5\pm 1.5\pm 1.0)10^{-3}$, $l^{\prime \prime }=(1.4\pm 0.7\pm 0.4)10^{-3}$ for a quadratic fit.

Submitted to Phys. Lett. B

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