Magnetic moment of the Delta(1232)-resonance in chiral effective field theory

Abstract

We perform a relativistic chiral effective field theory calculation of the radiative pion photoproduction ($\gamma p\to {\pi }^{0}p{\gamma }^{\prime }$) in the $\Delta$-resonance region, to next-to-leading order in the ``delta-expansion''. This work is aimed at a model-independent extraction of the ${\Delta }^{+}$ magnetic moment from new precise measurements of this reaction. It also predicts the chiral behavior of $\Delta$'s magnetic moment, which can be used to extrapolate the recent lattice QCD results to the physical point.

Comments: 5 pages, 3 figures; two sentences and one reference added - version accepted for publication in PRL