Phys. Rev. Lett. 66, 2189–2192 (1991)Upper limit on the branching ratio for the decay π0→νν¯Received 26 December 1990; published in the issue dated 29 April 1991 An experimental upper limit on the branching ratio for the decay π0→νν¯ is set at 8.3×10-7 (90% C.L.). This decay is forbidden if neutrinos are purely left handed. The limit also applies to any decays of the π0 to weakly interacting neutrals. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.66.2189
DOI:
10.1103/PhysRevLett.66.2189
PACS:
13.20.Cz, 14.60.Gh
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