Low Energy Constants from Kl4 Form-Factors

Abstract

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.

6 pages, uses axodraw.sty, 2 figures, bug in program corrected, new numerical results

References in corpus (1)

• Renormalization of chiral perturbation theory to order p^6

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