Low Energy Constants from Kl4 Form-Factors

G. Amor\'os (Lund U. & Helsinki U.); J. Bijnens; P. Talavera (Lund U.)

arxiv: hep-ph/9912398 · v2 · submitted 1999-12-17 · ✦ hep-ph

Low Energy Constants from Kl4 Form-Factors

G. Amor\'os (Lund U. & Helsinki U.) , J. Bijnens , P. Talavera (Lund U.) This is my paper

classification ✦ hep-ph

keywords chptconstantsform-factorstwo-loopcalculatedcalculationschangeschiral

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We have calculated the form-factors F and G in K ---> pi pi e nu decays (Kl4) to two-loop order in Chiral Perturbation Theory (ChPT). Combining this together with earlier two-loop calculations an updated set of values for the L's, the ChPT constants at p^4, is obtained. We discuss the uncertainties in the determination and the changes compared to previous estimates.

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