Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-11-21
Physics
High Energy Physics
High Energy Physics - Phenomenology
PROCEEDINGS to the 33rd International School of Nuclear Physics "From Quarks and Gluons to Hadrons and Nuclei"- 7 Pag,, 1 Tabl
Scientific paper
In this work we study the $\pi N$ scattering process within the Baryon Chiral Perturbation Theory framework in the covariant scheme of Extended-On-Mass-Shell (EOMS). We compare the description obtained in this scheme with the previously obtained using the Infrared Regularization scheme and show that EOMS accomplishes the best convergence, being able to extract from partial wave analyses reliable values of important quantities as the Goldberger-Treiman deviation. In regard to the latter, we solve the long-standing problem concerning to the extraction of the Goldberger-Treiman deviation with covariant ChPT that jeopardized the applicability of ChPT to the $\pi N$ system. We also show the potential of the unitarization techniques applied to the perturbative calculation in the EOMS scheme, that allow us to increase the range of validity of our description up to $\approx 200$ MeV in $\sqrt{s}$.
Alarcón J. M.
Camalich Martin J.
Oller Jose Antonio
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