Measurement of the K_L \to πμνform factor parameters with the KLOE detector

Details Measurement of the K_L \to πμνform factor parameters with the KLOE detector Measurement of the K_L \to πμνform factor parameters with the KLOE detector

2007-10-24

arxiv.org/abs/0710.4470v3

JHEP 0712:105,2007

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1088/1126-6708/2007/12/105

Using 328 pb^{-1}of data collected at DAFNE corresponding to $\sim$ 1.8 million $K_L\to \pi\mu\nu$ decays, we have measured the $K_{\mu 3}$ form factor parameters. The structure of the $K-\pi$ vector-current provides information about the dynamics of the strong interaction; its knowledge is necessary for evaluation of the phase-space integral required for measuring the CKM matrix element $V_{us}$ and for testing lepton universality in kaon decays. Using a new parametrization for the vector and scalar form factors, we find $\lambda_+$=\pt(25.7\pm 0.6),-3, and $\lambda_0$=\pt(14.0\pm 2.1),-3,. Our result for $\lambda_0$, together with recent lattice calculations of $f_\pi$, $f_K$ and $f(0)$, satisfies the Callan-Trieman relation

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