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

Abstract

A previous calculation of electroweak O(alpha) corrections to deep-inelastic neutrino scattering, as e.g. measured by NuTeV and NOMAD, is supplemented by higher-order effects. In detail, we take into account universal two-loop effects from Δαand Δρas well as higher-order final-state photon radiation off muons in the structure function approach. Moreover, we make use of the recently released O(alpha)-improved parton distributions MRST2004QED and identify the relevant QED factorization scheme, which is DIS like. As a technical byproduct, we describe slicing and subtraction techniques for an efficient calculation of a new type of real corrections that are induced by the generated photon distribution. A numerical discussion of the higher-order effects suggests that the remaining theoretical uncertainty from unknown electroweak corrections is dominated by non-universal two-loop effects and is of the order 0.0003 when translated into a shift in sin^2θ_W=1-MW^2/MZ^2. The O(alpha) corrections implicitly included in the parton distributions lead to a shift of about 0.0004.

25 pages, latex, 8 postscript figures

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• Parton distributions incorporating QED contributions
• Nuclear Antishadowing in Neutrino Deep Inelastic Scattering
• The NuTeV Anomaly, Lepton Universality, and Non-Universal Neutrino-Gauge Couplings
• Effect of Asymmetric Strange-Antistrange Sea to the NuTeV Anomaly
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• The NuTeV Anomaly, Neutrino Mixing, and a Heavy Higgs Boson
• Radiative Corrections to Neutrino Deep Inelastic Scattering Revisited
• Strange quark asymmetry in the nucleon and the NuTeV anomaly
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• Nuclear modification difference between u_v and d_v distributions and its relation to NuTeV sin^2 theta_W anomaly
• Possible Explanations for the NuTeV Weinberg Angle Measurement
• Relations Between NC and CC Neutrino Structure Functions for Nucleons and Nuclei

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