Journal
PHYSICS LETTERS B
Volume 569, Issue 3-4, Pages 159-167Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2003.07.049
Keywords
effective field theory; narrow resonances
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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. (C) 2003 Elsevier B.V. All fights reserved.
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