Nuclear modification of valence-quark distributions and its effects on NuTeV sin^2 theta_W anomaly

Details Nuclear modification of valence-quark distributions and its effects on NuTeV sin^2 theta_W anomaly Nuclear modification of valence-quark distributions and its effects on NuTeV sin^2 theta_W anomaly

2004-12-21

arxiv.org/abs/hep-ph/0412307v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, LaTeX, 1 eps file, to be published in Proceedings of the 6th International Workshop on Neutrino Factories and Superbe

Scientific paper

10.1016/j.nuclphysbps.2005.05.09

We investigated a nuclear modification difference between up- and down-valence quark distributions by analyzing structure function F_2 and Drell-Yan cross-section ratios. Although nuclear modifications of the valence-quark distributions themselves are rather well determined, it is difficult to find their difference from the present data. We estimated such an effect on the NuTeV sin^2 theta_W value and its uncertainty by the Hessian method. At this stage, it is not large enough to explain the whole NuTeV anomaly. However, the modification difference cannot be precisely determined, so that further studies are needed.

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