Precision EW tests provide valuable information about Standard- and Beyond-Standard-Model Physics

• Precision EW tests provide valuable information about Standard- and Beyond-Standard-Model Physics

• Neutrino experiments provide important EW precision measurements

• For NuTeV the SM predicts 0.2227 ± 0.0003 but we measure

• sin2qW(on-shell) = 0.2277 ± 0.0013(stat.) ±0.0009(syst.)

• (Previous neutrino measurements gave 0.2277 ± 0.0036)

• In comparison to the Standard Model

  • The NuTeV data prefers a lower effective left-handed quark coupling

• The discrepancy with the Standard Model could be related to:

  • Quark model uncertainties (but only partially!)
  • and / or
  • Possibly new physics that is associated with neutrinos and interactions with left-handed quarks

Notes: