Pion-delta sigma-term
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 expected non-analytic terms in the chiral limit. We obtain the results $σ_N=46$ MeV and $σ_Δ=32$ MeV, which are very close to values extracted from experiment and produced by other groups.
hep-ph↗