Narrow resonances in effective field theory

P. F. Bedaque, H. W. Hammer, U. Van Kolck

Research output: Contribution to journalArticlepeer-review

150 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)159-167
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
StatePublished - Sep 11 2003


  • Effective field theory
  • Narrow resonances

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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