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We present a formulation of soft-collinear effective theory (SCET) in thetwo-jet sector as a theory of decoupled sectors of QCD coupled to Wilson lines.The formulation is manifestly boost-invariant, does not require theintroduction of ultrasoft modes at the hard matching scale Q, and has manifestpower counting in inverse powers of Q. The spurious infrared divergences whicharise in SCET when ultrasoft modes are not included in loops disappear when theoverlap between the sectors is correctly subtracted, in a manner similar to thefamiliar zero-bin subtraction of SCET. We illustrate this approach by analyzingdeep inelastic scattering in the endpoint region in SCET and comment on otherapplications.

Power Counting and Modes in SCET