2007/09/30 by Vladimir Pascalutsa, Marc Vanderhaeghen · 3 citations
Physics and Astronomy · #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevd.77.014027
published as Phys.Rev.D77:014027,2008 · 32 pages, 14 figs
arxiv created 2007/10/01 · arxiv updated 2009/12/01
We present a theoretical study of the radiative pion photoproduction on the nucleon (γN → πN γ') in the \De-resonance region, with the aim to determine the magnetic dipole moment (MDM) of the Δ+(1232). The study is done within the framework of chiral effective-field theory where the expansion is performed (to next-to-leading order) in the δ power-counting scheme which is an extension of chiral perturbation theory to the Δ-resonance energy region. We present the results for the absorptive part of the Δ MDM, as well as perform a sensitivity study of the dependence of γN → πN γ' observables on the real part of the Δ MDM. We find that an asymmetry for circular polarization of the photon beam may provide a model-independent way to measure the Δ MDM.