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A previous calculation of electroweak O(alpha) corrections to deep-inelasticneutrino scattering, as e.g. measured by NuTeV and NOMAD, is supplemented byhigher-order effects. In detail, we take into account universal two-loopeffects from \Delta\alpha and \Delta\rho as well as higher-order final-statephoton radiation off muons in the structure function approach. Moreover, wemake use of the recently released O(alpha)-improved parton distributionsMRST2004QED and identify the relevant QED factorization scheme, which is DISlike. As a technical byproduct, we describe slicing and subtraction techniquesfor an efficient calculation of a new type of real corrections that are inducedby the generated photon distribution. A numerical discussion of thehigher-order effects suggests that the remaining theoretical uncertainty fromunknown electroweak corrections is dominated by non-universal two-loop effectsand is of the order 0.0003 when translated into a shift insin^2\theta_W=1-MW^2/MZ^2. The O(alpha) corrections implicitly included in theparton distributions lead to a shift of about 0.0004.Comment: 25 pages, latex, 8 postscript figure

Electroweak higher-order effects and theoretical uncertainties in deep-inelastic neutrino scattering