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Narrow resonances in effective field theory
2003
Physics Letters B
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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.
doi:10.1016/j.physletb.2003.07.049
fatcat:r7ex5vl2vnaifo76lax6g4zihe