paper

Invariant Operators in Collinear Effective Theory

arXiv:hep-ph/0107001 · doi:10.1016/S0370-2693(01)00902-9

Abstract

We consider processes which produce final state hadrons whose energy is much greater than their mass. In this limit interactions involving collinear fermions and gluons are constrained by a symmetry, and we give a general set of rules for constructing leading and subleading invariant operators. Wilson coefficients C(mu,P) are functions of a label operator P, and do not commute with collinear fields. The symmetry is used to reproduce a two-loop result for factorization in B -> D pi in a simple way.

11 pages, 2 figs, journal version

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