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Mandaglio, G; Bellini, V; Bocquet, J P; Capogni, M; Curciarello, F; D'Angelo, A; De Leo, V; Didelez, J P; Di Salvo, R; Fantini, A
EPJ Web of conferences, 01/2014, Letnik: 72Journal Article
Differential and total cross section measurements on eta' photoproduction were published by the CLAS Collaboration (M. Dugger et al., Phys.Rev.Lett.96, 062001 (2006) and M. Williams et al., Phys.Rev.C80, 045213 (2009)) for center-of-mass energies from near the threshold up to 2.84 GeV, and by the CB-ELSA-TAPS Collaboration (V. Crede et al., Phys.Rev.C80, 055202 (2009)) up to 2.36 GeV and also making a precise threshold scan of the differential cross section in the 1446 - 1527.4 MeV gamma beam energy range. 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 have also polarization observables in order to solve the ambiguity in the choice of the parameters used in their models. We present the analysis of the eta' photoproduction off the proton, identifying the meson via the gamma gamma , pi super(0)pi super(0)eta, and pi super(+)pi super(-)eta decay modes by using the GRAAL apparatus; and we show the preliminary GRAAL results on the beam asymmetry capital sigma from the threshold (1.446 GeV) up to 1.5 GeV.
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