Narrow Resonances in Effective Field Theory

Details Narrow Resonances in Effective Field Theory Narrow Resonances in Effective Field Theory

2003-04-02

arxiv.org/abs/nucl-th/0304007v1

Phys.Lett. B569 (2003) 159-167

Physics

Nuclear Physics

Nuclear Theory

11 pages, revtex4, 3 ps figures

Scientific paper

10.1016/j.physletb.2003.07.049

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.

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