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, 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
TL;DR
This paper reports a precise measurement of the K(e4) decay branching ratio, the s-wave pi-pi scattering length a00, and the hadronic form factors, providing valuable data for understanding low-energy QCD interactions.
Contribution
It presents new experimental measurements of K(e4) decay parameters and pi-pi scattering length using a large data sample, improving previous precision and understanding.
Findings
K(e4) branching ratio measured as (4.11±0.01±0.11)×10^(-5)
pi-pi scattering length a00 determined as 0.228±0.012±0.003
Form factors F, G, H characterized and their dependence on pi-pi invariant mass
Abstract
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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