PT Journal
AU Guerrero Navarro, GH
   Vicente Vacas, MJ
TI Threshold pion electro- and photoproduction off nucleons in covariant chiral perturbation theory
SO Physical Review D
JI Phys. Rev. D
PY 2020
BP 113016
EP 23pp
VL 102
IS 11
DI 10.1103/PhysRevD.102.113016
LA English
AB Pion electro- and photoproduction off the nucleon close to threshold is studied in covariant baryon chiral perturbation theory at O(p(3)) in the extended-on-mass-shell scheme, with the explicit inclusion of the Delta(1232) resonance. The relevant low energy constants are fixed by fitting the available experimental data with the theoretical model. The inclusion of the Delta resonance as an explicit degree of freedom substantially improves the agreement with data and the convergence of the model.
ER