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arxiv: hep-ex/0106071 · v1 · pith:5VSBLNCJnew · submitted 2001-06-19 · ✦ hep-ex

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

S. Pislak , R. Appel , G.S. Atoyan , B. Bassalleck , D.R. Bergman , N. Cheung , S. Dhawan , H. Do
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J. Egger S. Eilerts W. Herold V.V. Issakov H. Kaspar D.E. Kraus D. M. Lazarus P. Lichard J. Lowe J. Lozano H. Ma W. Majid A.A. Poblaguev P. Rehak A. Sher J.A. Thompson P. Truol M.E. Zeller BNL-E865 Collaboration
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classification ✦ hep-ex
keywords decaylengthpi-pis-waveanalysisbeenbranchingbrookhaven
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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.

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