München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 5: Theorie
HK 5.1: Vortrag
Montag, 20. März 2006, 14:00–14:15, B
Pion-photon exchange nucleon-nucleon potentials — •Norbert Kaiser — Physik-Dept. T39, TU Muenchen, 85747 Garching
We calculate in chiral perturbation theory the long-range isospin-violating NN-potential generated by pion-photon exchange. The leading order term and the dominant next-to-leading correction (proportional to the large isovector magnetic moment κv = 4.7 of the nucleon) turn out to be of similar size but opposite in sign. The corresponding spin-spin and tensor potentials VS,T(r) in coordinate space have a simple analytical form. We consider also effects from virtual Δ-isobar excitation as well as other isospin-breaking contributions to the 2π-exchange NN-potential induced by additional one-photon exchange. The dominant two-loop 2πγ-exchange potential proportional to the large isoscalar p-wave π N-coupling c3 is also evaluated. Our analytical results are in form such that they can be easily implemented into phase-shift analyses and few-body calculations.