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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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