Search for pi(0)-->nu(mu)nu(mu) decays in the LSND detector.
We observe a net beam excess of 8.7+/-6.3(stat)+/-2.4(syst) events, above 160 MeV, resulting from the charged-current reaction of nu(micro) and/or nu;(mu) on C and H in the LSND detector. No beam-related muon background is expected in this energy regime. Within an analysis framework of pi(0)-->nu(mu)nu;(mu), we set a direct upper limit for this branching ratio of Gamma(pi(0)-->nu(mu)nu;(mu))/Gamma(pi(0)-->all)<1.6 x 10(-6) at 90% confidence level.
Auerbach
L B
LB
Temple University, Philadelphia, Pennsylvania 19122, USA.
Burman
R L
RL
Caldwell
D O
DO
Church
E D
ED
Cochran
A K
AK
Donahue
J B
JB
Fazely
A R
AR
Garvey
G T
GT
Gunasingha
R M
RM
Imlay
R L
RL
Kahrimanis
G
G
Louis
W C
WC
Majkic
R
R
Malik
A
A
McIlhany
K L
KL
Metcalf
W J
WJ
Mills
G B
GB
Rupnik
D
D
Sandberg
V D
VD
Smith
D
D
Somodi
R F
RF
Stancu
I
I
Strossman
W D
WD
Sung
M
M
Tayloe
R
R
VanDalen
G J
GJ
Vernon
W
W
Wadia
N
N
White
D H
DH
Yellin
S
S
Yi
H
H