We report a new extraction of nucleon resonance couplings using pi- photoproduction cross sections on the neutron. The world database for the process gn-->pi-p above 1 GeV has quadrupled with the addition of new differential cross sections from the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab in Hall B. Differential cross sections from CLAS have been improved with a new final-state interaction determination using a diagrammatic technique taking into account the SAID phenomenological NN and piN final-state interaction amplitudes. Resonance couplings have been extracted and compared to previous determinations. With the addition of these new cross sections, significant changes are seen in the high-energy behavior of the SAID cross sections and amplitudes.
@article{arxiv.1208.0970,
title = {Progress on Neutron-Target Multipoles above 1 GeV},
author = {I. I. Strakovsky and W. Chen and H. Gao and W. J. Briscoe and D. Dutta and A. E. Kudryavtsev and M. Mirazite and M. Paris and P. Rossi and S. Stepanyan and V. E. Tarasov and R. L. Workman},
journal= {arXiv preprint arXiv:1208.0970},
year = {2017}
}
Comments
4 pages, 3 figures, 1 table; talk given at 12th International Workshop on Meson Production, Properties and Interaction (MESON2012), 31 May - 5 June 2012, Krakow, Poland; will be published online in European Journal Web of Conferences