Non-factorizable contributions to deep inelastic scattering at large x

We use soft-collinear effective theory (SCET) to study the factorization properties of deep inelastic scattering in the region of phase space where 1-x = O(Lambda_{QCD/Q}). By applying a regions analysis to loop diagrams in the Breit frame, we show that the appropriate version of SCET includes anti-hard-collinear, collinear, and soft-collinear fields. We find that the effects of the soft-collinear fields spoil perturbative factorization even at leading order in the 1/Q expansion.

lepton nucleon: deep inelastic scattering
factorization
effective Lagrangian
Feynman graph: higher-order
quantum chromodynamics
current: electromagnetic
parton: momentum spectrum
tree approximation

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