https://doi.org/10.1051/epjconf/20100303003
Low-energy π NN system
1
Forschungszentrum Jülich, Institut für Kernphysik (Theorie) and
Julich Center for Hadron Physics, D-52425
Jülich,
Germany
2
Institute for Theoretical and Experimental Physics, B.
Cheremushkinskaya 25, 117218
Moscow,
Russia
a e-mail: v.baru@fz-juelich.de
The reaction NN → NNπ is studied at low energies within chiral perturbation theory (ChPT). Special emphasis is put on p-wave pion production in different channels of NN → NNπ and Charge Symmetry Breaking (CSB) effects in pn → dπ0 recently measured at TRIUMF. A very good agreement of the p-wave amplitudes with experimental observables demonstrates the applicability of ChPT to these reactions regardless the large momentum transfer. The results of a complete calculation of CSB effects at leading order are presented. Based on this calculation we extract the strong contribution to the neutron-proton mass difference.
© Owned by the authors, published by EDP Sciences, 2010
