K_{l4} at two-loops and CHPT predictions for ππ-scattering

Gabriel Amoros , Johan Bijnens (Lund) , Pere Talavera (Orsay)

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classification ✦ hep-ph

keywords chptpredictionstwo-loopscalculationschiraldecay-constantsdiscussell4

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We present the results from our two-loop calculations of masses, decay-constants, vacuum-expectation-values and the $K_{\ell4}$ form-factors in three-flavour Chiral Perturbation Theory (CHPT). We use this to fit the $L_i^r$ to two-loops and discuss the ensuing predictions for $\pi\pi$-threshold parameters.

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K_{l4} at two-loops and CHPT predictions for ππ-scattering

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