Inverse muon decay, neutrino dimuon production, and a search for neutral heavy leptons at the Tevatron

The authors report on three recent measurements by the CCFR collaboration using the Fermilab Tevatron quad-triplet neutrino beam with neutrino energies up to 600 GeV. In a sample of 666,000 neutrino and 132,000 antineutrino events, 1,151 inverse μ-decay events, νμe- → μ-νe, were isolated corresponding to a rate with respect to νμ-N charged current interactions of (0.125 ± .009(stat.) ± .003(sys.)) x 10-2. The data also contain 1,522 νμ and 275 bar νμ induced opposite sign dimuon events which are due predominantly to charm production at the hadronic vertex. Using this sample, they have measured the strange sea content of the nucleon, ηs = ∫ dx(2xs(x))/ ∫ dx(xu(x)+xd(x)) = 0.57+0.012-0.008, the Cabbibo-Kobayashi-Masakawa matrix element, |Vcd| = 0.220+.015-.018, and the slow-rescaling model charm mass parameter, mc = 1.3+0.6-0.5GeV. Finally, a search for neutral heavy leptons in our μ-μ+ sample excludes such particles with masses up to 18 GeV and muonic coupling greater than 10-3 with respect to standard Fermi coupling. 14 refs., 4 figs