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Title: Scrutinizing the evidence for N ( 1685 )

The helicity-dependent observable E for the reaction γd → ηn(p) with a spectator proton was recently measured in this paper by the A2 Collaboration at MAMI in Mainz. The data were interpreted as further evidence for a narrow resonance with spin and parity J P = 1/2 + (P 11 wave). However, a full partial-wave analysis without any narrow resonance leads to an excellent description of the data. Finally, imposing a narrow resonance with the properties suggested by the A2 Collaboration leads to a significant deterioration of the fit quality: there is no need for a narrow resonance.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [1] ;  [4]
  1. Univ. of Bonn (Germany). Helmholtz Inst. for Radiation and Nuclear Physics; Petersburg Nuclear Physics Inst., Gatchina (Russian Federation). National Research Centre Kurchatov Inst.
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Univ. of Bonn (Germany). Helmholtz Inst. for Radiation and Nuclear Physics; Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. Univ. of Bonn (Germany). Helmholtz Inst. for Radiation and Nuclear Physics
Publication Date:
Report Number(s):
JLAB-PHY-17-2548; DOE/OR/23177-4210; arXiv:1701.06387
Journal ID: ISSN 2469-9985
Grant/Contract Number:
AC05-06OR23177; SFB/TR110; RSF 16-12-10267
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 3; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. of Bonn (Germany); Petersburg Nuclear Physics Inst., Gatchina (Russian Federation)
Sponsoring Org:
USDOE; German Research Foundation (DFG); Russian Science Foundation (RSF)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; particle interactions; photon & charged-lepton interactions with hadrons; photonuclear reactions; baryons; exotic baryons
OSTI Identifier:
1391858
Alternate Identifier(s):
OSTI ID: 1349391