High statistics measurement of Ke4 decay properties
Abstract
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.).
Cite
@article{arxiv.hep-ex/0301040,
title = {High statistics measurement of Ke4 decay properties},
author = {S. Pislak and R. Appel and G. S. Atoyan and B. Bassalleck and D. R. Bergman and N. Cheung and S. Dhawan and H. Do and J. Egger and S. Eilerts and H. Fischer and W. Herold and V. V. Issakov and H. Kaspar and D. E. Kraus and D. M. Lazarus and P. Lichard and J. Lowe and J. Lozano and H. Ma and W. Majid and A. A. Poblaguev and P. Rehak and A. Sher and Aleksey Sher and J. A. Thompson and P. Truöl and M. E. Zeller},
journal= {arXiv preprint arXiv:hep-ex/0301040},
year = {2008}
}
Comments
15 pages, 10 figures, submitted to Phys. Rev. D