Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-10-17
Phys.Lett.B707:523-528,2012
Physics
High Energy Physics
High Energy Physics - Phenomenology
revtex4, 7 pages, 3 figures; text improved, new comments and references
Scientific paper
Charge and isospin symmetry violations to valence and sea distribution functions in the nucleon are evaluated (at low resolution scale) by means of a meson cloud model and light-cone quark wave functions. Their perturbative evolution are implemented at Next-to-next-to-leading order (NNLO) using an original evolution code in order to include the perturbatively generated strange - anti-strange asymmetry typical of the three loop evolution expansion. Charge symmetry violating QED effects are also added and the distributions, evolved at the experimental scale, are compared with available information. The role of non-perturbative effects is emphasized in the interpretation of the, so called, NuTeV anomaly and new experiments at very-high energy.
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