title: New measurement of K(+)(e4) decay and the s-pave pi pi-scattering length a(0)(0).
abstract: 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.
authors.affiliation: Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Pislak
authors.forename: R
authors.initials: R
authors.lastname: Appel
authors.forename: G S
authors.initials: GS
authors.lastname: Atoyan
authors.forename: B
authors.initials: B
authors.lastname: Bassalleck
authors.forename: D R
authors.initials: DR
authors.lastname: Bergman
authors.forename: N
authors.initials: N
authors.lastname: Cheung
authors.forename: S
authors.initials: S
authors.lastname: Dhawan
authors.forename: H
authors.initials: H
authors.lastname: Do
authors.forename: J
authors.initials: J
authors.lastname: Egger
authors.forename: S
authors.initials: S
authors.lastname: Eilerts
authors.forename: W
authors.initials: W
authors.lastname: Herold
authors.forename: V V
authors.initials: VV
authors.lastname: Issakov
authors.forename: H
authors.initials: H
authors.lastname: Kaspar
authors.forename: D E
authors.initials: DE
authors.lastname: Kraus
authors.forename: D M
authors.initials: DM
authors.lastname: Lazarus
authors.forename: P
authors.initials: P
authors.lastname: Lichard
authors.forename: J
authors.initials: J
authors.lastname: Lowe
authors.forename: J
authors.initials: J
authors.lastname: Lozano
authors.forename: H
authors.initials: H
authors.lastname: Ma
authors.forename: W
authors.initials: W
authors.lastname: Majid
authors.forename: A A
authors.initials: AA
authors.lastname: Poblaguev
authors.forename: P
authors.initials: P
authors.lastname: Rehak
authors.forename: A
authors.initials: A
authors.lastname: Sher
authors.forename: J A
authors.initials: JA
authors.lastname: Thompson
authors.forename: P
authors.initials: P
authors.lastname: Truöl
authors.forename: M E
authors.initials: ME
authors.lastname: Zeller