Complete next-to-next-to-leading order calculation of NN → NNπ in chiral effective field theory

We present the results of the pion production operator calculated up-to-and- including next-to-next-to-leading order (NNLO) in chiral effective field theory. We in- clude explicit Delta degrees of freedom and demonstrate that they provide essential con- tribution required to understand neutral pion production data. Analysis of chiral loops at NNLO reveals new mechanisms which are important, but haven't been considered in phenomenological studies so far.