2003/06/26 by I. G. Aznauryan · 3 citations
Chemistry · Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Inorganic Fluorides and Related Compounds #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.1103/physrevc.68.065204
published as Phys.Rev. C68 (2003) 065204 · 26 pages, 6 figures
arxiv created 2003/06/26 · openalex publication_date 2003/12/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Using dispersion relations good description of existing data on \ensuremathη photoproduction on protons in the resonance energy region is obtained, and the contributions of the resonances D13(1520), S11(1535), S11(1650), D15(1675), F15(1680), D13(1700), P11(1710), P13(1720) to \ensuremathγp\ensuremath→\ensuremathηp are found. In order to estimate model dependence of the obtained resonance characteristics, an isobar model is used for the analysis of the same data. We conclude that the results for the contributions of the resonances D13(1520), S11(1535), S11(1650), F15(1680) to corresponding multipole amplitudes are stable. With this the results for D13(1520) and F15(1680), combined with their Particle Data Group (PDG) photoexcitation helicity amplitudes, allow to find the branching ratios Br[D13(1520)\ensuremath→\ensuremathηN]=(0.05\ifmmode±\else\textpm\fi0.02)%, Br[F15(1680)\ensuremath→\ensuremathηN]=(0.16\ifmmode±\else\textpm\fi0.04)% which have significantly better accuracy than the PDG data. The total Breit-Wigner width of the S11(1535) is model dependent. We have obtained \ensuremathΓ[S11(1520)]=142\phantom\rule0.3em0exMeV and 195\phantom\rule0.3em0exMeV using dispersion relations and the isobar model, respectively. The results for the D15(1675), P11(1710), P13(1720) obtained in two approaches are close to each other. The results for the D13(1700) are model dependent.