Chiral effective-field theory in the Delta(1232) region : II. radiative pion photoproduction
We present a theoretical study of the radiative pion photoproduction on the nucleon ($$\gamma N \rightarrow \pi N \gamma'$$) in the $$\De$$-resonance region, with the aim to determine the magnetic dipole moment (MDM) of the $$\Delta^+(1232)$$. The study is done within the framework of chiral effective-field theory where the expansion is performed (to next-to-leading order) in the $$\delta$$ power-counting scheme which is an extension of chiral perturbation theory to the $$\Delta$$-resonance energy region. We present in detail the results for the absorptive part of the $$\Delta$$ MDM, as well as a sensitivity study for the radiative pion photoproduction observables on the real part of the $$\Delta$$ MDM. We find that an asymmetry for circular polarization of the photon beam may provide a model-independent way to measure the $$\Delta$$ MDM.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE - Office of Energy Research (ER)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 917691
- Report Number(s):
- JLAB-THY-07-739; DOE/OR/23177-0170; arxiv:0709.4583; TRN: US0805082
- Country of Publication:
- United States
- Language:
- English
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