Neutrino production of opposite sign dimuons in the NOMAD experiment

Astier, P.; Autiero, D.; Baldisseri, A.; Baldo, Massimilla; Ballocchi, G.; Banner, M.; Bassompierre, G.; Benslama, K.; Besson, N.; Bird, I.; Blumenfeld, B.; Bobisut, Furio; Bouchez, J.; Boyd, S.; Bueno, A.; Bunyatov, S.; Camilleri, L.; Cardini, A.; Cattaneo, P. W.; Cavasinni, V.; CERVERA VILLANUEVA, A.; Collazuol, Gianmaria; Conforto, G.; Conta, C.; Contalbrigo, M.; Cousins, R.; Daniels, D.; Degaudenzi, H.; DE SANTO, A.; Delprete, T.; Dignan, T.; DI LELLA, L.; Silva, E. DO COUTO E.; Dumarchez, J.; Ellis, M.; Fazio, T.; Feldman, G. J.; Ferrari, R.; Ferrere, D.; Flaminio, V.; Fraternali, M.; Gaillard, J. M.; Gangler, E.; Geiser, A.; Geppert, D.; Gibin, Daniele; Gninenko, S.; Godley, A.; GOMEZ CADENAS, J. J.; Gosset, J.; Gossling, C.; Gouanere, M.; Grant, A.; Graziani, G.; Guglielmi, A.; Hagner, C.; Hernando, J.; Hubbard, D.; Hurst, P.; Hyett, N.; Iacopini, E.; Joseph, C.; Juget, F.; Kirsanov, M.; Klimov, O.; Kokkonen, J.; Kovzelev, A.; Krasnoperov, A.; Kuznetsov, V.; Lacaprara, S.; Lakic, B.; Lanza, A.; LA ROTONDA, L.; Laveder, Marco; LETESSIER SELVON, A.; Levy, J. M.; Linssen, L.; Ljubicic, A.; Long, J.; Lupi, A.; MANOLA POGGIOLI, E.; Marchionni, A.; Martelli, F.; Mechain, X.; Mendiburu, J. P.; Meyer, J. P.; Mezzetto, M.; Mishra, S. R.; Moorhead, G. F.; Mossuz, L.; Nedelec, P.; Nefedov, Y. U.; NGUYEN MAU, C.; Orestano, D.; Pastore, F.; Peak, L. S.; Pennacchio, E.; Pessard, H.; Petti, R.; Placci, A.; Pluquet, A.; Polesello, G.; Pollmann, D.; Polyarush, A.; Popov, B.; Poulsen, C.; Rathouit, P.; Roda, C.; Rubbia, A.; Salvatore, F.; Schahmaneche, K.; Schmidt, B.; Schmidt, T.; Sevior, M. E.; Sillou, D.; Soler, F. J. P.; Sozzi, G.; Steele, D.; Steininger, M.; Stiegler, U.; Stipcevic, M.; Stolarczyk, T.; TAREB REYES, M.; Taylor, G. N.; Tereshchenko, S.; Toropin, A.; Touchard, A. M.; Tovey, S. N.; Tran, M. T.; Tsesmelis, E.; Ulrichs, J.; Vacavant, L.; VALDATA NAPPI, M.; Valuev, V.; Vannucci, F.; Varvell, K. E.; Veltri, M.; Vercesi, V.; Verkindt, D.; Vieira, J. M.; Vinogradova, T.; M. K., Vo; Weber, F.; Weisse, T.; Wilson, F.; Winton, L. J.; Yabsley, B. D.; Zaccone, H.; Zuber, K.; Zuccon, P.

doi:10.1016/S0370-2693(00)00612-2

The NOMAD Collaboration presents a study of opposite sign dimuon events in the framework of Leading Order QCD. A total of 2714 neutrino- and 115 antineutrino-induced opposite sign dimuon events with E-mu 1, E-mu 2 > 4.5 GeV, 15 < E-nu < 300 GeV and Q(2) > 1 (GeV/c)(2) are observed in the Front-Calorimeter of NOMAD during the 1995 and 1996 runs. The analysis yields a value for the charm quark mass of m(c) = 1.3(-0.3-0.3)(+0.3+0.3) GeV/c(2) and fur the average semileptonic branching ratio of B-c = 0.095(-0.007-0.013)(+0.007+0.014). The ratio of the strange to non-strange sea in the nucleon is measured to be kappa = 0.48(-0.07-0.12)(+0.09+0.17). The measured rate of charm-induced dimuon relative to single muon, as a function of neutrino energy, is consistent with the slow rescaling hypothesis of heavy quark production.