Radiatively Generated Isospin Violations in the Nucleon

Details Radiatively Generated Isospin Violations in the Nucleon Radiatively Generated Isospin Violations in the Nucleon

2005-01-18

arxiv.org/abs/hep-ph/0501169v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 3 figures

Scientific paper

Isospin violating valence and sea distributions are evaluated due to QED leading ${\cal{O}}{(\alpha)}$ corrections to the standard QCD evolution equations. Unique perturbative predictions are obtained within the radiative parton model, and confirm earlier results. Nonperturbative contributions have been estimated and depend on a single free parameter chosen to be the current quark mass.The relevance of our predictions for extracting $\sin^2 \theta_W$ from DIS $\nu(\bar{\nu})N$ data (`NuTeV anomaly') is discussed as well.

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