A new measurement of K+(e4) decay and the s-wave pi-pi-scattering length a00

Abstract

A sample of 400000 events from the decay K+->pi+pi-e+nu(e)(K(e4)) has been collected in experiment E865 at the Brookhaven AGS. The analysis of these data yields new measurements of the K(e4) branching ratio (4.11+-0.01+-0.11)*10**(-5)), the s-wave pi-pi scattering length a00=0.228+-0.012+-0.003, and the form factors F, G, and H of the hadronic current and their dependence on the invariant pi-pi mass.

References in corpus (10)

• Roy equation analysis of pi pi scattering
• Elastic $\pi \pi$ scattering to two loops
• The Low Energy $\pi \pi$ Amplitude to One and Two Loops
• QCD Isospin Breaking in Meson Masses, Decay Constants and Quark Mass Ratios
• The pi pi S-wave scattering lengths
• The quark condensate from K_{e_4} decays
• $K_{\ell 4}$ Form-Factors and $\pi$-$\pi$ Scattering
• Determination of Two-Loop $\pi \pi$ Scattering Amplitude Parameters
• Low Energy Constants from Kl4 Form-Factors
• A Parametrization for $K^{+}\to {\pi }^{+}{\pi }^{-}{e}^{+}\nu$

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