Search for pi(0)-->nu(mu)nu(mu) decays in the LSND detector.

Authors :: Auerbach LB
Burman RL
Caldwell DO
Church ED
Cochran AK
Donahue JB
Fazely AR
Garvey GT
Gunasingha RM
Imlay RL
Kahrimanis G
Louis WC
Majkic R
Malik A
McIlhany KL
Metcalf WJ
Mills GB
Rupnik D
Sandberg VD
Smith D
Somodi RF
Stancu I
Strossman WD
Sung M
Tayloe R
VanDalen GJ
Vernon W
Wadia N
White DH
Yellin S
Yi H
Source :: Physical review letters [Phys Rev Lett] 2004 Mar 05; Vol. 92 (9), pp. 091801. Date of Electronic Publication: 2004 Mar 04.
Publication Year :: 2004
Abstract: 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.