The Kpi vector form factor and constraints from Kl3 decays

Details The Kpi vector form factor and constraints from Kl3 decays The Kpi vector form factor and constraints from Kl3 decays

2011-01-14

arxiv.org/abs/1101.2887v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, uses econfmacros style. Talk presented by R. Escribano at the 6th International Workshop on the CKM Unitarity Triangl

Scientific paper

The slope and curvature parameters of the $K\pi$ vector form factor, $F_+^{K\pi}$, are fitted to the data on $\tauKpi$ and $K_{l3}$ decays yielding $\lambda_+'=(25.49 \pm 0.31) \times 10^{-3}$ and $\lambda_+"= (12.22 \pm 0.14) \times 10^{-4}$. The pole position of the $K^*(892)^\pm$ is found to be at $m_{K^*(892)^\pm}= 892.0\pm 0.5$ MeV and $\Gamma_{K^*(892)^\pm}= 46.5 \pm1.1$ MeV. The phase-space integrals relevant for $K_{l3}$ analyses and the $P$-wave isospin-1/2 $K\pi$ phase-shift threshold parameters are also calculated.

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