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2002•Physical Review LettersOpen access

Precise Determination of Electroweak Parameters in Neutrino-Nucleon Scattering

G. P. Zeller, K. S. McFarland, T. Adams, A. Alton, S. Avvakumov, L. de Barbaro, P. de Barbaro, Robert Bernstein, A. Bodek, T. Bolton, J. Brau, D. Buchholz, H. Budd, L. Bugel, J. M. Conrad, R. B. Drucker, B. T. Fleming, R. Frey, J. A. Formaggio, J. Goldman, M. Goncharov, Deborah A. Harris, R. A. Johnson, J. H. Kim, S. Koutsoliotas, M. J. Lamm, W. Marsh, D. Mason, J. McDonald, C. McNulty, D. Naples, P. Nienaber, A. Romosan, W. K. Sakumoto, H. Schellman, M. H. Shaevitz, P. Spentzouris, E. G. Stern, N. Suwonjandee, M. Tzanov, M. Vakili, A. Vaitaitis, U. K. Yang, J. S. Yu, E. D. Zimmerman

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Abstract

The NuTeV Collaboration has extracted the electroweak parameter ${sin}^{2}{\ensuremath{\theta}}_{W}$ from the measurement of the ratios of neutral current to charged current $\ensuremath{\nu}$ and $\overline{\ensuremath{\nu}}$ cross sections. Our value, ${sin}^{2}{\ensuremath{\theta}}_{W}^{(\mathrm{on}\ensuremath{-}\mathrm{shell})}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.2277\ifmmode\pm\else\textpm\fi{}0.0013(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.0009(\mathrm{syst})$, is 3 standard deviations above the standard model prediction. We also present a model independent analysis of the same data in terms of neutral-current quark couplings.

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What this paper is about

The NuTeV Collaboration has extracted the electroweak parameter ${sin}^{2}{\ensuremath{\theta}}_{W}$ from the measurement of the ratios of neutral current to charged current $\ensuremath{\nu}$ and $\overline{\ensuremath{\nu}}$ cross sections. Our value, ${sin}^{2}{\ensuremath{\theta}}_{W}^{(\mathrm{on}\ensuremath{-}\mathrm{shell})}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.2277\ifmmode\pm\else\textpm\fi{}0.0013(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.0009(\mathrm{syst})$, is 3 standard deviations above the standard model prediction. We also present a model independent analysis of the same data in terms of neutral-current quark couplings.

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Available abstract

The NuTeV Collaboration has extracted the electroweak parameter ${sin}^{2}{\ensuremath{\theta}}_{W}$ from the measurement of the ratios of neutral current to charged current $\ensuremath{\nu}$ and $\overline{\ensuremath{\nu}}$ cross sections. Our value, ${sin}^{2}{\ensuremath{\theta}}_{W}^{(\mathrm{on}\ensuremath{-}\mathrm{shell})}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.2277\ifmmode\pm\else\textpm\fi{}0.0013(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.0009(\mathrm{syst})$, is 3 standard deviations above the standard model prediction. We also present a model independent analysis of the same data in terms of neutral-current quark couplings.

Key concepts: Electroweak interaction, Physics, Particle physics, Neutral current, Charged current, Standard Model (mathematical formulation), Weinberg angle, Nucleon

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