Article
Beam-Target Helicity Asymmetry for γ→ n→→ π− p in the N* Resonance Region
Physical review letters
Document Type
Article
Publication Date
1-1-2017
Disciplines
Abstract
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 solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) 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 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 photocouplings.
Published Citation
Ho, D., P. Peng, C. Bass, P. Collins, A. D’Angelo, A. Deur, J. Fleming, Biselli A. et al [CLAS Collaboration]. "Beam-Target Helicity Asymmetry for γ→ n→→ π− p in the N* Resonance Region." Physical review letters 118, no. 24 (2017). https://doi.org/10.1103/PhysRevLett.118.242002
DOI
10.1103/PhysRevLett.118.242002
Citation Information
D. Ho, Angela Biselli and CLAS Collaboration. "Beam-Target Helicity Asymmetry for γ→ n→→ π− p in the N* Resonance Region" Physical review letters Vol. 118 Iss. 24 (2017) Available at: http://works.bepress.com/angela_biselli/145/
Copyright 2017 American Physical Society
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