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Title: Eta photoproduction in a combined analysis of pion- and photon-induced reactions

The $$\eta N$$ final state is isospin-selective and thus provides access to the spectrum of excited nucleons without being affected by excited $$\Delta$$ states. To this end, the world database on eta photoproduction off the proton up to a center-of-mass energy of $$E\sim 2.3$$ GeV is analyzed, including data on differential cross sections, and single and double polarization observables. The resonance spectrum and its properties are determined in a combined analysis of eta and pion photoproduction off the proton together with the reactions $$\pi N\to \pi N$$, $$\eta N$$, $$K\Lambda$$ and $$K\Sigma$$. For the analysis, the so-called J\"ulich coupled-channel framework is used, incorporating unitarity, analyticity, and effective three-body channels. Parameters tied to photoproduction and hadronic interactions are varied simultaneously. Furthermore, the influence of recent MAMI $T$ and $F$ asymmetry data on the eta photoproduction amplitude is discussed in detail.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Univ. Bonn, Bonn (Germany)
  2. The George Washington Univ., Washington, D.C. (United States)
  3. Forschungszentrum Julich, Julich (Germany)
  4. Univ. Bonn, Bonn (Germany); Forschungszentrum Julich, Julich (Germany)
  5. Forschungszentrum Julich, Julich (Germany); Univ. of Georgia, Athens, GA (United States)
Publication Date:
OSTI Identifier:
1303859
Report Number(s):
JLAB-THY--16-2323; DOE/OR/23177--3902; arXiv:1504.01643
Journal ID: ISSN 1434-6001; PII: 252; PHY 1415459
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
European Physical Journal. A
Additional Journal Information:
Journal Volume: 51; Journal Issue: 6; Journal ID: ISSN 1434-6001
Publisher:
Springer
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS