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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Struktur und Dynamik von Kernen
HK 10.7: Vortrag
Montag, 19. März 2012, 18:30–18:45, RW 3
Neutral pion photoproduction on the trinucleon in ChPT — •Mark Lenkewitz1, Evgeny Epelbaum2, Hans-Werner Hammer1, and Ulf-G. Meißner1 — 1Helmholtz-Institut für Strahlen- und Kernphysik und Bethe-Center for Theoretical Physics, Universität Bonn — 2Institut für Theoretische Physik II, Ruhr-Universität Bochum
Threshold pion photoproduction on the trinucleon is investigated in the framework of baryon ChPT at next-to-leading one-loop order in the chiral expansion. To this order in small momenta, the production operator is a sum of one- and two-nucleon terms. We calculate the expectation value of the production operator using chiral wave functions in a manifestly three-dimensional approach without partial wave expansion. The resulting integrals are evaluated using Monte Carlo integration.We obtain results for the threshold production multipoles on 3He and 3H and comment on the sensitivity to the fundamental neutron amplitude.
[1] M. Lenkewitz, E. Epelbaum, H.-W. Hammer, Ulf-G. Meißner, Phys. Lett. B 700 (2011) 365. http://arxiv.org/abs/1103.3400