Improved unitarized Heavy Baryon Chiral Perturbation Theory for π N scattering



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Gómez Nicola, Ángel and Nieves, J. and Peláez Sagredo, José Ramón and Ruiz Arriola, E. (2000) Improved unitarized Heavy Baryon Chiral Perturbation Theory for π N scattering. Physics letters B, 486 (1-feb). pp. 77-85. ISSN 0370-2693

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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 ∆ 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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© 2000 Elsevier Science B.V. All rights reserved.
This research was supported by DGES under contract PB98-1367 and by the Junta de Andalucía. Work partially supported by DGICYT under contracts AEN97-1693 and PB98-0782. We thank P. Buttiker, J.A.Oller and E.Oset for useful comments and discussions.

Uncontrolled Keywords:Nucleon scattering; Elastic-scattering; Meson interactions; One-loop; Approximation; Amplitude; Model
Subjects:Sciences > Physics > Physics-Mathematical models
Sciences > Physics > Mathematical physics
ID Code:30673
Deposited On:05 Jun 2015 09:37
Last Modified:10 Dec 2018 15:10

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