Measurement of η photoproduction on the proton from threshold to 1500 MeV

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• 作者：The GRAAL Collaboration ; O. Bartalini ; V. Bellini ; J. P. Bocquet ; P. Calvat ; M. Capogni ; L. Casano ; M. Castoldi ; A. D'Angelo and J. -P. Didelez ; et al.
• 关键词：PACS. 13.60.Le Meson production ; 13.88.+e Polarization in interactions and scattering ; 25.20.Lj Photoproduction reactions
• 刊名：The European Physical Journal A - Hadrons and Nuclei
• 出版年：2007
• 出版时间：August, 2007
• 年：2007
• 卷：33
• 期：2
• 页码：169-184
• 全文大小：583 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Nuclear Physics, Heavy Ions and Hadrons
  Elementary Particles and Nuclei
  Nuclear Fusion
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-601X

文摘

Beam asymmetry and differential cross-section for the reaction γp → ηp were measured from production threshold to 1500MeV photon laboratory energy. The two dominant neutral decay modes of the η -meson, η → 2γ and η → 3π0 , were analyzed. The full set of measurements is in good agreement with previously published results. Our data were compared with three models. They all fit satisfactorily the results but their respective resonance contributions are quite different. The possible photoexcitation of a narrow state N(1670) was investigated and no evidence was found.