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New measurement of K(+)(e4) decay and the s-pave pi pi-scattering length a(0)(0)
S Pislak1, R Appel, G S Atoyan
1Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland.
Physical Review Letters
|December 12, 2001
Abstract:
A sample of 4 x 10(5) events from the decay K(+)-->pi(+)pi(-)e(+)nu(e) (K(e4)) has been collected in experiment E865 at the Brookhaven Alternating Gradient Synchrotron. The analysis of these data yields new measurements of the K(e4) branching ratio [(4.11+/-0.01+/-0.11) x 10(-5)], the s-wave pi pi scattering length [a(0)(0) = 0.216+/-0.013(stat)+/-0.004(syst)+/-0.005(theor)], and the form factors F, G, and H of the hadronic current and their dependence on the invariant pi pi mass.