KK scattering amplitude to one loop in chiral perturbation theory, its unitarization and pion form factors Original Research Article

We have calculated the KK → KK scattering amplitude to next-to-leading order in chiral perturbation theory. Then, making use of a unitarization procedure with one or several coupled channels (ππ, KK in our case) we have calculated the ππ → ππ, ππ → KK and KK → KK S- and P-waves in good agreement with the experiment up to √s ⋍ 1.2 GeV.