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      On Power Suppressed Operators and Gauge Invariance in SCET

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          Abstract

          The form of collinear gauge invariance for power suppressed operators in the soft-collinear effective theory is discussed. Using a field redefinition we show that it is possible to make any power suppressed ultrasoft-collinear operators invariant under the original leading order gauge transformations. Our manipulations avoid gauge fixing. The Lagrangians to O(lambda^2) are given in terms of these new fields. We then give a simple procedure for constructing power suppressed soft-collinear operators in SCET_II by using an intermediate theory SCET_I.

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          Author and article information

          Journal
          19 March 2003
          2003-07-10
          Article
          10.1103/PhysRevD.68.034021
          hep-ph/0303156
          2b28c030-3ee9-4a0b-ad26-8dbbbd261fbd
          History
          Custom metadata
          MIT-CTP-3349, UCSD/PTH 03-01
          Phys.Rev. D68 (2003) 034021
          15 pages, journal version
          hep-ph

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