4 papers · 1 filter
Pion-delta sigma-term
I. P. Cavalcante, M. R. Robilotta, J. Sa Borges +2
We use a configuration space chiral model in order to evaluate nucleon and delta sigma-terms. Analytic expressions are consistent with chiral counting rules and give rise to expect…
The Skyrmion Model and the Dynamical Breakdown of Chiral Symmetry
F. L. Braghin, I. P. Cavalcante
A scalar field, , is coupled to the skyrmion. Its classical value in the vacuum ("condensate") reduces to the pion decay constant, , being thus proportional to the…
Unitarized pion-nucleon scattering amplitude from inverse amplitude method
Isabela P. Cavalcante, J. Sa Borges
In a recent work on low energy pion-nucleon scattering, instead of using chiral perturbation theory (ChPT) amplitude, we started from a pion-nucleon {\it soft-pion} result and used…
Unitarized ChPT Amplitudes and Crossing Symmetry Violation
Isabela P. Cavalcante, J. Sá Borges
Pion-pion scattering amplitude obtained from one-loop Chiral Perturbation Theory (ChPT) is crossing symmetric, however the corresponding partial-wave amplitudes do not respect exac…