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Levi Sandri, P.; Mandaglio, G.; De Leo, V.; Bartalini, O.; Bellini, V.; Bocquet, J. -P.; Capogni, M.; Curciarello, F.; Didelez, J. -P.; D’Angelo, A.; Di Salvo, R.; Fantini, A.; Franco, D.; Gervino, G.; Ghio, F.; Girolami, B.; Giusa, A.; Lapik, A.; Lleres, A.; Mammoliti, F.; Manganaro, M.; Moricciani, D.; Mushkarenkov, A.; Nedorezov, V.; Randieri, C.; Rebreyend, D.; Rudnev, N.; Russo, G.; Schaerf, C.; Sperduto, M. -L.; Sutera, M. -C.; Turinge, A.; Vegna, V.; Zonta, I.
The European physical journal. A, Hadrons and nuclei, 07/2015, Letnik: 51, Številka: 7Journal Article
The $\Sigma$ beam asymmetry in $\eta^{\prime}$ photoproduction off the proton was measured at the GrAAL polarized photon beam with incoming photon energies of 1.461 and 1.480 GeV. For both energies the asymmetry as a function of the meson emission angle shows a clear structure, more pronounced at the lowest one, with a change of sign around 90$^o$. The results are compared to the existing theories that fail to account for the data.
