+ v • In this case, the w+ decay liould be too ~ rapid to observe directly in emulsion. + + (g) ProC I12/2HE, M, 1-1 Leing respectively mCisses of v m L v L the heavy lepton and the nucleon. f{x ) is shown for ~ = 2 GeV (curve 1) and m ~ = 4 GeV (curve 2). The full curve 3 shO\1S the assumed neutrino spectrum, neE ), multiplied by kaon decay shoulder of the spectrum is not v v included. .4ction of heavy muon, H, in the process v + N +!-1 + hadrons i ++ + follo\'led by the decay H + ~ (e ) + V (v ) + v • l.l e ~ O O(h) Production of heavy muon, M, in the process v + N + M + hadrons, o + +followed by the decay H + ~ + ~ (e ) + V (v ). ~ e Note that other detection processes could not distinguish between (a), (b), (d), {f}, (h). Figure 2: + The dotted lines show the branching ratio f(x ) = o(v + M_) as a function of m o{v + ~ ) neutrino energy, E, where x