New Measurement Of Ke4(+) Decay And The S- Wave Pi Pi Scattering Length A(0)(0) (Vol 87, Pg 2001, 221801)

S Pislak,R Appel,G S Atoyan,B Bassalleck,D R Bergman,N Cheung,S Dhawan,H Do,J P Egger,S Eilerts,W D Herold,V V Issakov,H Kaspar,D E Kraus,D M Lazarus,P Lichard,J J Lowe, J Lozano,Hongtao Ma,W Majid, A Poblaguev, P Rehak,A Sher,J A Thompson, P Truol,M Zeller

PHYSICAL REVIEW LETTERS（2010）

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摘要

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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form factor

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