Effect of asymmetric strange seas and isospin-violating parton distribution functions onsin2θWmeasured in the NuTeV experiment
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields2002Vol. 65(11)
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G. P. Zeller, K. S. McFarland, T. Adams, T. Alexander, 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. Yu, E. D. Zimmerman
Abstract
The NuTeV Collaboration recently reported a value of ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{W}$ measured in neutrino-nucleon scattering that is 3 standard deviations above the standard model prediction. This result is derived assuming that (1) the strange sea is quark-antiquark symmetric, $s(x)=\overline{s}(x),$ and (2) up and down quark distributions are symmetric under the simultaneous interchange of $u\ensuremath{\leftrightarrow}d$ and $p\ensuremath{\leftrightarrow}n.$ We report the impact of violations of these symmetries on ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{W}$ and discuss the theoretical and experimental constraints on such asymmetries.