Low energy analysis of $\pi N$ scattering and the pion-nucleon sigma term with covariant baryon chiral perturbation theory

J. M. Alarcón, J. Martin Camalich, J. A. Oller

The pion-nucleon sigma term (${\sigma }_{\pi N}$) is an observable of fundamental importance because embodies information about the internal scalar structure of the nucleon. Nowadays this qua…