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Title: The impact of $$K^{+}\Lambda$$ photoproduction on the resonance spectrum

The Julich-Bonn coupled-channel framework is extended to $$K^+\Lambda$$ photoproduction. The spectrum of nucleon and $$\Delta$$ resonances is extracted from simultaneous fits to several pion-induced reactions in addition to pion, eta and $$K^+\Lambda$$ photoproduction off the proton. More than 40,000 data points up to a center-of-mass energy of E$$\sim$$2.3 GeV including recently measured double-polarization observables are analyzed. The influence of the $$\gamma p\to K^+\Lambda$$ channel on the extracted resonance parameters and the appearance of states not seen in other channels is investigated. Furthermore, the Julich-Bonn model includes effective three-body channels and guarantees unitarity and analyticity, which is a prerequisite for a reliable determination of the resonance spectrum in terms of poles and residues.
Authors:
 [1] ;  [2] ;  [3]
  1. Univ. Bonn, Bonn (Germany)
  2. The George Washington Univ., Washington, D.C. (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Univ. Bonn, Bonn (Germany); Forschungszentrum Julich, Julich (Germany)
Publication Date:
Report Number(s):
JLAB-THY-18-2640; DOE/OR/23177-4341; arXiv:1801.10458
Journal ID: ISSN 1434-6001; PII: 12541
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
European Physical Journal. A
Additional Journal Information:
Journal Volume: 54; 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 Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1462176