Beam asymmetry Σ in η′ photoproduction off the proton at the GRAAL experiment

Abstract : The only recent η′ photoproduction data off proton available in literature are the differential and total cross sections published by the CLAS and CB-ELSA-TAPS Collaborations. However, the wide information about reaction cross sections are not sufficient to understand the role of resonances involved in the process. Different theoretical works stressed the importance to measure also polarization observables in order to solve the ambiguities in the choice of the parameters used in their models. We present the analysis of η′ photoproduction off the proton analysis, identifying the investigated meson by the π+π−η, π0π0η, and γγ decay modes by using the GRAAL apparatus; and we show the preliminary GRAAL results on the beam asymmetry Σ at beam energy of 1475 MeV.
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Submitted on : Monday, January 4, 2016 - 3:24:48 PM
Last modification on : Tuesday, May 22, 2018 - 9:48:10 PM

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G. Mandaglio, V. Bellini, J.P. Bocquet, M. Capogni, F. Curciarello, et al.. Beam asymmetry Σ in η′ photoproduction off the proton at the GRAAL experiment. 13th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2013), Sep 2013, Rome, Italy. pp.04006, ⟨10.1051/epjconf/20147304006⟩. ⟨in2p3-01250284⟩

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