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Neutrino production of opposite sign dimuons in the NOMAD experiment

P. Astier D. Autiero A. Baldisseri M. Baldo-Ceolin G. Ballocchi M. Banner G. Bassompierre 1 K. Benslama N. Besson I. Bird B. Blumenfeld F. Bobisut J. Bouchez S. Boyd A. Bueno S. Bunyatov L. Camilleri A. Cardini P W. Cattaneo V. Cavasinni A. Cervera-Villanueva G M. Collazuol G. Conforto C. Conta M. Contalbrigo R. Cousins D. Daniels H. Degaudenzi A. de Santo T. del Prete T. Dignan L. Di Lella E Silva E. Do Couto J. Dumarchez M. Ellis T. Fazio 1 G J. Feldman R. Ferrari D. Ferrere V. Flaminio M. Fraternali J.M. Gaillard 1 E. Gangler A. Geiser D. Geppert D. Gibin S. Gninenko A. Godley J J. Gomez-Cadenas J. Gosset C. Gssling M. Gouanere 1 A. Grant G. Graziani a M. Guglielmi C. Hagner J. Hernando D. Hubbard P. Hurst N. Hyett E. Iacopini C. Joseph F. Juget M. Kirsanov O. Klimov J. Kokkonen A. Kovzelev A. Krasnoperov 1 V. Kuznetsov S. Lacaprara B. Lakic A. Lanza L. La Rotonda M. Laveder A. Letessier-Selvon J M. Levy L. Linssen A. Ljubicic J. Long A. Lupi E. Manola-Poggioli 1 A. Marchionni F. Martelli X. Mechain J.P. Mendiburu 1 J P. Meyer M. Mezzetto S R. Mishra G F. Moorhead L. Mossuz 1 P. Nedelec 1 Yu. Nefedov C. Nguyen-Mau D. Orestano F. Pastore L S. Peak E. Pennacchio H. Pessard 1 R. Petti A. Placci A. Pluquet G. Polesello D. Pollmann A. Polyarush B. Popov C. Poulsen P. Rathouit C. Roda A. Rubbia F. Salvatore K. Schahmaneche B. Schmidt T. Schmidt M E. Sevior D. Sillou 1 F J P. Soler Gabriella Sozzi D. Steele M. Steininger U. Stiegler M. Stipcevic T. Stolarczyk M. Tareb-Reyes G N. Taylor S. Tereshchenko A. Toropin a M. Touchard S N. Tovey M T. Tran E. Tsesmelis J. Ulrichs L. Vacavant M. Valdata-Nappi V. Valuev 1 F. Vannucci K E. Varvell M. Veltri V. Vercesi D. Verkindt J M. Vieira T. Vinogradova M K. Vo F. Weber T. Weisse F F. Wilson L J. Winton B D. Yabsley H. Zaccone K. Zuber P. Zuccon
Abstract : 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 $Q^{2} 1\;(\mbox{GeV}/\mbox{c})^{2}$ 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 $m_{c} = 1.3^{+0.3\;+0.3}_{-0.3\;-0.3}\;\mbox{GeV}/\m box{c}^{2}$ and for the average semileptonic branching ratio of $B_{c} = 0.095^{+0.007\;+0.014}_{-0.007\;-0.013}$. The ratio of the strange to non-strange sea in the nucleon is measured to be $\kappa = 0.48^{+0.09 +0.17}_{-0.07 -0.12}$. 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.
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P. Astier, D. Autiero, A. Baldisseri, M. Baldo-Ceolin, G. Ballocchi, et al.. Neutrino production of opposite sign dimuons in the NOMAD experiment. Physics Letters B, Elsevier, 2000, 486, pp.35-48. ⟨in2p3-00006060⟩

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