Low Energy Constants from Kl4 Form-Factors

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

Low Energy Constants from Kl4 Form-Factors

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arxiv hep-ph/9912398 v2 pith:DIQQ7HG7 submitted 1999-12-17 hep-ph

G. Amorós (Lund U. & Helsinki U.) , J. Bijnens , P. Talavera (Lund U.) This is my paper · ORCID

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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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First complete lattice QCD determination of the four structure-dependent form factors for K- → ℓ- ν̄ℓ ℓ'+ ℓ'- decays at physical quark masses with controlled statistical and systematic errors.

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