A Departure from Prediction: Electroweak Physics at Nutev

Details A Departure from Prediction: Electroweak Physics at Nutev A Departure from Prediction: Electroweak Physics at Nutev

2002-05-22

arxiv.org/abs/hep-ex/0205080v2

Physics

High Energy Physics

High Energy Physics - Experiment

submitted to the proceedings of Rencontres de la Vallee d'Aoste, March 2002, 16 pages, 5 figures; v2. fix Eqn 9 and delta-N de

Scientific paper

The NuTeV experiment has performed precision measurements of the ratio of neutral-current to charged-current cross-sections in high rate, high energy neutrino and anti-neutrino beams on a dense, primarily steel, target. The separate neutrino and anti-neutrino beams, high statistics, and improved control of other experimental systematics, allow the determination of electroweak parameters with significantly greater precision than past neutrino-nucleon scattering experiments. Our null hypothesis test of the standard model prediction measures sin2thetaW=0.2277+/-0.0013(stat)+/-0.0009(syst), a value which is 3.0 standard deviations above the prediction. We discuss possible explanations for and implications of this discrepancy.

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