Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Hadronenstruktur und -spektroskopie VIII

HK 44.6: Gruppenbericht

Donnerstag, 18. März 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. Meißner1,3,4,51Institut 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 NNNNπ 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 pndπ0.

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