Johan Bijnens, Pere Talavera
We study the electromagnetic form factor of the pion and kaons at
low-energies with the use of Chiral Perturbation Theory. The analysis
is performed within the three flavour framework and at
next-to-next-to-leading order. We explain carefully all the relevant
consistency checks on the expressions, present full analytical results
for the pion form factor and describe all the assumptions in the
analysis. From the phenomenological point of view we make use of our
expression and the available data to obtain the charge radius of the
pion obtaining $_V^\pi=(0.452+-0.013) fm^2$, as well as the
low-energy constant $L_9^r(m_\rho)= (5.93+-0.43)10^{-3}$. We also
obtain experimental values for 3 combinations of order $p^6$
constants.