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

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arxiv hep-ex/0106071 v1 pith:5VSBLNCJ submitted 2001-06-19 hep-ex

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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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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  1. Global parametrizations of $\pi\pi$ scattering with dispersive constraints: Beyond the S0 wave

    hep-ph 2024-12 conditional novelty 6.0 of 10

    New global, dispersion-constrained parametrizations for the S2, P, D, F, and G pion-pion partial waves, valid to roughly 1.8 to 2.1 GeV.

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