Power Counting in Dimensionally Regularized NRQCD

Details Power Counting in Dimensionally Regularized NRQCD Power Counting in Dimensionally Regularized NRQCD

1997-07-10

arxiv.org/abs/hep-ph/9707313v1

Phys.Rev. D57 (1998) 413-423

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 5 figures, revtex

Scientific paper

10.1103/PhysRevD.57.413

We present a scheme for calculating in NRQCD with consistent power counting in the heavy quark velocity v. As an example, we perform the systematic matching of an external current onto NRQCD at subleading order in v, a calculation relevant for the process e^+e^- -> hadrons near threshold. Consistent velocity power counting in dimensional regularization is achieved by including two distinct gluon fields, one corresponding to gluon radiation and one corresponding to an instantaneous potential. In this scheme power counting is manifest in any gauge, and also holds for non-gauge interactions. The matching conditions for an external vector current in NRQCD are calculated to O(g^2 v^2) and the cancellation of infrared divergences in the matching conditions is shown to require both gluon fields. Some subtleties arising in the matching conditions at subleading order are addressed.

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