The Kpi vector form factor and constraints from Kl3 decays

Diogo R. Boito, Rafel Escribano, Matthias Jamin

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 $λ_+'=(25.49 \pm 0.31) \times 10^{-3…