Bonn 2010 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 44: Hadronenstruktur und -spektroskopie VIII
HK 44.6: Group Report
Thursday, March 18, 2010, 15:30–16:00, HG IV
Pion production in nucleon-nucleon collisions at low energies — •Vadim Baru1,2, Evgeny Epelbaum1,3,4, Arseniy Filin2,3, Johann Haidenbauer1,5, Christoph Hanhart1,5, Alexander Kudryavtsev2, Vadim Lensky2,6, and Ulf-G. Meißner1,3,4,5 — 1Institut für Kernphysik (Theorie) and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany — 2Institute for Theoretical and Experimental Physics, 117218, B. Cheremushkinskaya 25, Moscow, Russia — 3Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, D-53115 Bonn, Germany — 4Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany — 5Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany — 6European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*), Strada delle Tabarelle 286, Villazzano (Trento), I-38050 TN, Italy
With the advent of chiral perturbation theory, the low-energy effective field theory of QCD, high accuracy calculations for hadronic reactions with a controlled error estimation have become possible. We survey the recent developments in the reaction NN → NNπ in chiral EFT. We argue that the counting scheme that acknowledges the large momentum transfer between the initial and the final nucleons allows for a consistent description of s- and p-wave pion production. The status of the theory for pion production in the isospin conserving case allows us to challenge charge symmetry breaking effects recently observed experimentally in pn→ dπ0.