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The resummed differential thrust rate in e+e- annihilation is calculatedusing Soft-Collinear Effective Theory (SCET). The resulting distribution in thetwo-jet region T~1 is found to agree with the corresponding expression derivedby the standard approach. A matching procedure to account for finitecorrections at T < 1 is then described. There are two important advantages ofthe SCET approach. First, SCET manifests a dynamical seesaw scale q = p^2/Q inaddition to the center-of-mass energy Q and the jet mass scale p ~ Q ~ sqrt(1 -T). Thus, the resummation of logs of p/q can be cleanly distinguished from theresummation of logs of Q/p. Second, finite parts of loop amplitudes appear inspecific places in the perturbative distribution: in the matching to the hardfunction, at the scale Q, in matching to the jet function, at the scale p, andin matching to the soft function, at the scale q. This allows for a consistentmerger of fixed order corrections and resummation. In particular, the total NLOe+e- cross section is reproduced from these finite parts without having toperform additional infrared regulation.

Resummation and NLO Matching of Event Shapes with Effective Field Theory