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Search for pi(0)-->nu(mu)nu(mu) decays in the LSND detector
L B Auerbach1, R L Burman, D O Caldwell
1Temple University, Philadelphia, Pennsylvania 19122, USA.
Physical Review Letters
|April 20, 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.