Reparameterization invariance for collinear operators

Published

Journal Article

We discuss restrictions on operators in the soft-collinear effective theory (SCET) which follow from the ambiguity in the decomposition of collinear momenta and the freedom in the choice of light-like basis vectors n and n̄. Invariance of SCET under small changes in n and/or n̄ implies a symmetry of the effective theory that constrains the form of allowed operators with collinear fields. The restrictions occur at a given order in the power counting as well as between different orders. As an example, we present the complete set of higher order operators that are related to the collinear quark kinetic term. ©2002 Elsevier Science B.V. All rights reserved.

Full Text

Duke Authors

Cited Authors

  • Manohar, AV; Mehen, T; Pirjol, D; Stewart, IW

Published Date

  • July 11, 2002

Published In

Volume / Issue

  • 539 / 1-2

Start / End Page

  • 59 - 66

International Standard Serial Number (ISSN)

  • 0370-2693

Digital Object Identifier (DOI)

  • 10.1016/S0370-2693(02)02029-4

Citation Source

  • Scopus