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