Leading-order QCD Analysis of Neutrino-Induced Dimuon Events

P. Vilain , G. Wilquet , R. Beyer , W. Flegel , T. Mouthuy (1) , H. Vers , J. Panman , a N. Rozanov (1) , K. Winter , G. Zacek , V. Zacek , F W. Bsser , C. Foos , L. Gerland , T. Layda , F. Niebergall , G. Rdel , P. Sthelin , T. Voss , V. Lematre , D. Favart , G. Grgoire , E. Knoops , P. Gorbunov , E A. Grigoriev , V D. Khovanskii , A. Maslennikov , W. Lippich , A. Nathaniel , A. Staude , J. Vogt , a G. Cocco , A. Ereditato , G. Fiorillo , F. Marchetti-Stasi , P. Strolin , A. Capone , D. de Pedis , U. Dore , A. Frenkel-Rambaldi , P F. Loverre , D. Macina , G. Piredda , R. Santacesaria , E. Di Capua , B. Saitta , B. Akkus , E. Arik , M. Serin-Zeyrek , R. Sever , P. Tolun , R. Nahnhauer , H E. Roloff

1 CPPM - Centre de Physique des Particules de Marseille

The results of a leading-order QCD analysis of neutrino-induced charm production are presented. They are based on a sample of 4111 $\numu$- and 871 $\anumu$-induced opposite-sign dimuon events with $E_{\mu 1},E_{\mu 2} 6~{\rm GeV}$, $35 E_{\nu} 290~{\rm GeV}$ and $Q^2 5.5\,{\rm GeV^2}$, observed in the CHARM~II detector exposed to the CERN wideband neutrino and antineutrino beams. The analysis yields the value of \linebreak the charm quark mass $m_c=1.79\pm0.38\,{\rm GeV}/c^2$ and the Cabibbo--Kobayashi--Maskawa matrix element $|V_{cd}|=0.219\pm0.016$. The strange quark content of the nucleon is found to be suppressed with respect to non-strange sea quarks by a factor $\kappa =0.39\pm0.09$.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

P. Vilain, G. Wilquet, R. Beyer, W. Flegel, T. Mouthuy, et al.. Leading-order QCD Analysis of Neutrino-Induced Dimuon Events. European Physical Journal C: Particles and Fields, 1999, 11, pp.19-34. ⟨in2p3-00012122⟩