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Title: Beam-target helicity asymmetry for γ n π - p in the N * resonance region

In this paper, we report the first beam-target double-polarization asymmetries in the $$\gamma + n(p) \rightarrow \pi^- + p(p)$$ 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 analysis techniques 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 revised values for several $$\gamma nN^*$$ resonance photo-couplings.
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Publication Date:
Report Number(s):
JLAB-PHY-17-2438; DOE/OR/23177-4109; arXiv:1705.04713
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1702743
Grant/Contract Number:
AC05-06OR23177; AC02-06CH11357; SC0016583
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 24; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); George Washington Univ., Washington, DC (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); National Research Foundation of Korea (NRF)
Contributing Orgs:
CLAS Collaboration
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; pion photoproduction
OSTI Identifier:
1364106
Alternate Identifier(s):
OSTI ID: 1364204; OSTI ID: 1393447; OSTI ID: 1439806