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Improved unitarized Heavy Baryon Chiral Perturbation Theory for pi N scattering

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Improved unitarized Heavy Baryon Chiral Perturbation Theory for pi N scattering

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Gómez Nicola, Ángel; Nieves Pamplona, Juan Miguel; Peláez Sagredo, José Ramón; Ruiz Arriola, Enrique

Aquest document és un/a article, creat/da en: 2000

We show how the unitarized description of pion nucleon scattering within Heavy Baryon Chiral Perturbation Theory can be considerably improved, by a suitable reordering of the expansion over the nucleon mass. Within this framework, the Delta resonance and its associated pole can be recovered from the chiral parameters obtained from low-energy determinations. In addition, we can obtain a good description of the six S and P wave phase shifts in terms of chiral parameters with a natural size and compatible with the Resonance Saturation Hypothesis.

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