High statistics measurement of Ke4 decay properties

Details High statistics measurement of Ke4 decay properties High statistics measurement of Ke4 decay properties

2003-01-31

arxiv.org/abs/hep-ex/0301040v1

Phys.Rev.D67:072004,2003

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 10 figures, submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.67.072004

We report experimental details and results of a new measurement of the decay K+ -> pi+pi-e+nue (Ke4}. A sample of more than 400,000 Ke4 events with low background has been collected by Experiment 865 at the Brookhaven Alternate Gradient Synchrotron. From these data, the branching ratio (4.11+-0.01+-0.11)*10**(-5) and the pi-pi invariant mass dependence of the form factors F, G, and H of the weak hadronic current as well as the phase shift difference delta00-delta11 for pi-pi-scattering were extracted. Using constraints based on analyticity and chiral symmetry, a new value with considerably improved accuracy for the s-wave pi-pi-scattering length a00 has been obtained also: a00=0.216+-0.013 (stat.)+-0.002(syst.)+-0.002(theor.).

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