SAID Analysis of Meson Photoproduction : Determination of Neutron and Proton EM Couplings
arXiv:1401.3027 · doi:10.1051/epjconf/20147304003
Abstract
We present an overview of the GW SAID group effort to analyze on new pion photoproduction on both proton- and neutron-targets. The main database contribution came from the recent CLAS and MAMI unpolarized and polarized measurements. The differential cross section for the processes gamma n --> pi- p was extracted from new measurements accounting for Fermi motion effects in the impulse approximation (IA) as well as NN and piN effects beyond the IA. The EM coupling results are compared to other recent studies.
4 pages, 3 figures, 2 tables; Contribution to the proceedings of the 13th International Conference on Meson-Nucleon Physics and Structure of Nucleon (MENU 2013), Rome, Italy, Sept. - Oct. 2013
References in corpus (8)
- Unitary Isobar Model - MAID2007
- Extended Partial-Wave Analysis of piN Scattering Data
- Updated analysis of NN elastic scattering to 3 GeV
- Multichannel parametrization of πN scattering amplitudes and extraction of resonance parameters
- Well-established nucleon resonances revisited by double-polarization measurements
- Beam asymmetry for pi+ and pi0 photoproduction on the proton for photon energies from 1.102 to 1.862 GeV
- Helicity amplitudes for photoexcitation of nucleon resonances off neutrons
- Evaluation of the gn-->pi-p differential cross sections in the Delta-isobar region