  Neutral current single pion production induced by neutrinos and antineutrinos
on nucleon targets has been investigated in manifestly relativistic baryon
chiral perturbation theory with explicit $\Delta(1232)$ degrees of freedom up
to $\mathcal{O}(p^3)$. At low energies, where chiral perturbation theory is
applicable, the total cross sections for the different reaction channels
exhibit a sizable non-resonant contribution, which is not present in event
generators of broad use in neutrino oscillation and cross section experiments
such as GENIE and NuWro.
