Narrow Resonances in Effective Field Theory

Abstract

We discuss the power counting for effective field theories with narrow resonances near a two-body threshold. Close to threshold, the effective field theory is perturbative and only one combination of coupling constants is fine-tuned. In the vicinity of the resonance, a second, ``kinematic'' fine-tuning requires a nonperturbative resummation. We illustrate our results in the case of nucleon-alpha scattering.

11 pages, revtex4, 3 ps figures

References in corpus (1)

• Effective theory of the Delta(1232) in Compton scattering off the nucleon

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