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In this paper we show how gauge symmetries in an effective theory can be used to simplify proofs of factorization formulas in highly energetic hadronic processes. We use the soft-collinear effective theory, generalized to deal with back-to-back jets of collinear particles. Our proofs do not depend on the choice of a particular gauge, and the formalism is applicable to both exclusive and inclusive factorization. As examples we treat the - form factor (^*^0), light meson form factors (^*MM), as well as deep inelastic scattering (e^-pe^-X), the Drell-Yan process (ppXl^+l^-), and deeply virtual Compton scattering (^*p^ (*) p).
Bauer et al. (2002) studied this question.
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