New measurement of K(+)(e4) decay and the s-pave pi pi-scattering length a(0)(0).

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, P Truöl,M E Zeller

Physical review letters（2001）

引用 23|浏览5

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摘要

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.

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