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A precision measurement of electroweak parameters in neutrino-nucleon scattering

  • Author(s): McFarland, KS;
  • Arroyo, CG;
  • King, BJ;
  • De Barbaro, L;
  • De Barbaro, P;
  • Bazarko, AO;
  • Bernstein, RH;
  • Bodek, A;
  • Bolton, T;
  • Budd, H;
  • Bugel, L;
  • Conrad, J;
  • Drucker, RB;
  • Harris, DA;
  • Johnson, RA;
  • Kim, JH;
  • Kinnel, T;
  • Lamm, MJ;
  • Lefmann, WC;
  • Marsh, W;
  • McNulty, C;
  • Mishra, SR;
  • Naples, D;
  • Quintas, PZ;
  • Romosan, A;
  • Sakumoto, WK;
  • Schellman, H;
  • Sciulli, FJ;
  • Seligman, WG;
  • Shaevitz, MH;
  • Smith, WH;
  • Spentzouris, P;
  • Stern, EG;
  • Vakili, M;
  • Yang, UK;
  • Yu, J;
  • Zeller, GP
  • et al.
Abstract

The CCFR collaboration reports a precise measurement of electroweak parameters derived from the ratio of neutral-current to charged-current cross-sections in neutrino-nucleon scattering at the Fermilab Tevatron. We determine sin2 θ(on-shell)W = 0.2236 ± 0.0028 (expt.) ± 0.0030 (model) for Mtop = 175 GeV, MHiggs = 150 GeV. This is equivalent to MW = 80.35 ± 0.21 GeV. The good agreement of this measurement with Standard Model expectations implies the exclusion of additional vvqq contact interactions at 95% confidence at a mass scale of 1-8 TeV, depending on the form of the contact interaction.

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