Neutrino production of opposite sign dimuons in the NOMAD experiment
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# Neutrino production of opposite sign dimuons in the NOMAD experiment

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 NOMAD Collaboration; Astier, P.; Cervera Villanueva, Anselmo; Gómez Cadenas, Juan José Perfil This document is a artículoDate2000 Este documento está disponible también en : http://hdl.handle.net/10550/49654 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 Eμ1,Eμ2>4.5 GeV, 151(GeV/c)2 are observed %in the data from the 1995 and 1996 runs. in the Front-Calorimeter of NOMAD during the 1995 and 1996 runs. The analysis yields a value for the charm quark mass of mc=1.3+0.3+0.3−0.3−0.3GeV/\mboxc2 and for the average semileptonic branching ratio of Bc=0.095+0.007+0.014−0.007−0.013. The ratio of the strange to non-strange sea in the nucleon is measured to be κ=0.48+0.09+0.17−0.07−0.12. 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. NOMAD Collaboration Astier, P. Cervera Villanueva, Anselmo Gómez Cadenas, Juan José 2000 Neutrino production of opposite sign dimuons in the NOMAD experiment Physics Letters B 486 1-2 35 48 http://dx.doi.org/10.1016/S0370-2693(00)00612-2