Measurement of structure-dependent K+ --> &mgr;(+)nu(&mgr;)gamma decay
We report the first measurement of a structure-dependent component in the decay K+-->&mgr;(+)nu(&mgr;)gamma. Using the kinematic region where the muon kinetic energy is greater than 137 MeV and the photon energy is greater than 90 MeV, we find that the absolute value of the sum of the vector and axial-vector form factors is |F(V)+F(A)| = 0.165+/-0.007+/-0.011. This corresponds to a branching ratio of B(SD+) = (1.33+/-0.12+/-0.18)x10(-5). We also set the limit -0. 04<F(V)-F(A)<0.24 at 90% C.L.
Adler
S
Brookhaven National Laboratory, Upton, New York 11973, USA.
Atiya
MS
Chiang
IH
Diwan
MV
Frank
JS
Haggerty
JS
Kettell
SH
Kycia
TF
Li
KK
Littenberg
LS
Sambamurti
A
Stevens
A
Strand
RC
Witzig
C
Komatsubara
TK
Kuriki
M
Muramatsu
N
Sugimoto
S
Inagaki
T
Kabe
S
Kobayashi
M
Kuno
Y
Sato
T
Shinkawa
T
Yoshimura
Y
Kishi
Y