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

L B Auerbach; R L Burman; D O Caldwell; E D Church; A K Cochran; J B Donahue; A R Fazely; G T Garvey; R M Gunasingha; R L Imlay; G Kahrimanis; W C Louis; R Majkic; A Malik; K L McIlhany; W J Metcalf; G B Mills; D Rupnik; V D Sandberg; D Smith; R F Somodi; I Stancu; W D Strossman; M Sung; R Tayloe; G J VanDalen; W Vernon; N Wadia; D H White; S Yellin; H Yi; LSND Collaboration

doi:10.1103/PhysRevLett.92.091801

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

Phys Rev Lett. 2004 Mar 5;92(9):091801. doi: 10.1103/PhysRevLett.92.091801. Epub 2004 Mar 4.

Affiliation

¹ Temple University, Philadelphia, Pennsylvania 19122, USA.

PMID: 15089459
DOI: 10.1103/PhysRevLett.92.091801

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.