Abstract
Chiral effective field theory (EFT) of Quantum Chromodynamics (QCD) provides a model independent understanding of the nature at low energies. The short range physics in such an EFT is encoded in the so called low energy constants (LECs). These LECs, once determined from one process, can be applied to make predictions for many other processes. In this talk we focus on pion production in nucleon-nucleon collisions which provides access to the LEC that plays an important role connecting different few-nucleon reactions. We demonstrate that this LEC can be extracted from NN → NNπ by studying double polarization observables in the reaction The corresponding measurement is planned in the near future at the COSY accelerator.
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