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Title: Extracting meson-baryon contributions to the electroexcitation of the N (1675)-5/2 nucleon resonance

We report on the determination of the electrocouplings for the transition from the proton to the N (1675)-5/2 resonance state using recent differential cross section data on ep → eπ+n by the CLAS collaboration at 1.8 ≤ Q² < 4.5GeV². The data have been analyzed using two different approaches, the unitary isobar model and fixed-t dispersion relations. The extracted γ*p → N (1675)-5/2 helicity amplitudes show considerable coupling through the AP1/2 amplitude, that is significantly larger than predicted three-quark contribution to this amplitude. The amplitude AP3/2 is much smaller. Both results are consistent with the predicted sizes of the meson-baryon contributions at Q² ≥ 1.8 GeV² from the dynamical coupled-channel model.
Authors:
 [1] ;  [2]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Yerevan Physics Institute, Yerevan, (Armenia)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Publication Date:
OSTI Identifier:
1192846
Report Number(s):
JLAB-PHY--14-1990; DOE/OR/23177--3251; arXiv:1412.1296
Journal ID: ISSN 0556-2813; PRVCAN
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 1; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
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