Abstract
Analysis of 122 965 dimuon final states produced by 209-GeV muons in a magnetized iron calorimeter has set a lower limit on the mass of a neutral heavy muon ({bar M}{sup 0}). If the {bar M}{sup 0} is coupled with Fermi strength to a right-handed charged current and decays to {mu}{mu}{nu} with a 10% branching ratio, its mass exceeds 9 GeV/c{sup 2}.
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