Title
Beam-Target Helicity Asymmetry for γ→ n→→ π− p in the N* Resonance Region
Document Type
Article
Publication Date
2017
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.
Publication Title
Physical review letters
Repository Citation
Ho, D.; Biselli, Angela; and CLAS Collaboration, "Beam-Target Helicity Asymmetry for γ→ n→→ π− p in the N* Resonance Region" (2017). Physics Faculty Publications. 161.
https://digitalcommons.fairfield.edu/physics-facultypubs/161
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
Comments
Copyright 2017 American Physical Society
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