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Title: Primakoff effect in η-photoproduction off protons

In this paper, we analyse data on forward η -meson photoproduction off a proton target and extract the η → γγ decay width utilizing the Primakoff effect. The hadronic amplitude that enters into our analysis is strongly constrained because it is fixed from a global fit to available γp → pη data for differential cross-sections and polarizations. Finally, we compare our results with present information on the two-photon η-decay from the literature. We provide predictions for future PrimEx experiments at Jefferson Laboratory in order to motivate further studies.
Authors:
;  [1] ;  [1] ;  [2]
  1. Forschungszentrum Julich, Julich (Germany)
  2. Univ. Bonn, Bonn (Germany); Forschungszentrum Julich, Julich (Germany)
Publication Date:
OSTI Identifier:
1005092
Report Number(s):
JLAB-THY--10-1126; DOE/OR/23177--1123; arXiv:1001.0646
Journal ID: ISSN 1434-6001; TRN: US1101082
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
European Physical Journal. A
Additional Journal Information:
Journal Volume: 44; Journal Issue: 2; Journal ID: ISSN 1434-6001
Publisher:
Springer
Research Org:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; CEBAF ACCELERATOR; DECAY; DIFFERENTIAL CROSS SECTIONS; PHOTOPRODUCTION; PRIMAKOFF EFFECT; PROTONS; TARGETS