Radiatively Generated Isospin Violations in the Nucleon
Abstract
Isospin violating valence and sea distributions are evaluated due to QED leading O(α) 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 2 θW from DIS ()N data (`NuTeV anomaly') is discussed as well.
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