D. Ho, et al. (CLAS Collaboration)
Phys. Rev. Lett. 118 (24) (2017) 242002
Publication year: 2017

We report the first beam-target double-polarization asymmetries in the γ+n(p)π+p(p) reaction spanning the nucleon resonance region from invariant mass W= 1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in HD have been used with the CLAS detector at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the {\it{E}} polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses, and have led to significant revisions for several γnN resonance photo-couplings.

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