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  • First measurement of the helicity asymmetry \(E\) in \(\eta\) photoproduction on the proton
    Senderovich, I; Morrison, B T; Dugger, M; Pasyuk, E; Keith, C D; Meekins, D G; D R; Collins, P; Adhikari, K P; Akbar, Z; Anderson, M D; Badui, R A; Ball, J; Battaglieri, M; Bedlinskiy, I; Biselli, A S; Boiarinov, S; Brooks, W K; Carman, D S; Celentano, A; Chandavar, S; Charles, G; Cole, P L; Contalbrigo, M; D'Angelo, A; De Vita, R; De Sanctis, E; Dupre, R; Egiyan, H; Fradi, A; Elouadrhiri, L; Fedotov, G; Fegan, S; Filippi, A; Fleming, J A; Gilfoyle, G P; Giovanetti, K L; Glazier, D I; Goetz, J T; Gohn, W; Gothe, R W; Griffioen, K A; Guidal, M; Guo, L; Hakobyan, H; Hanretty, C; Hattawy, M; D Ho; Holtrop, M; Ishkhanov, B S; Jenkins, D; Jo, H S; Joo, K; Kim, A; Kubarovsky, V; Lenisa, P; Livingston, K; MacGregor, I J D; Mattione, P; Mineeva, T; Mokeev, V; Movsisyan, A; Net, L A; Niccolai, S; Niculescu, G; Niculescu, I; Osipenko, M; Park, K; Park, S; Peng, P; Phelps, W; Pogorelko, O; Price, J W; Prok, Y; Puckett, A J R; Rizzo, A; Rosner, G; Roy, P; Sabatie, F; Salgado, C; Schott, D; Schumacher, R A; Seder, E; Simonyan, A; Skorodumina, Iu; Smith, G D; Sokhan, D; Stepanyan, S; Stoler, P; Strakovsky, I I; Tian, Ye; Ungaro, M; Voskanyan, H; Walford, N K; Wei, X; Wood, M H; Zachariou, N; Zana, L; Zhao, Z W; Zonta, I

    arXiv.org, 01/2016
    Paper

    Results are presented for the first measurement of the double-polarization helicity asymmetry E for the \(\eta\) photoproduction reaction \(\gamma p \rightarrow \eta p\). Data were obtained using the FROzen Spin Target (FROST) with the CLAS spectrometer in Hall B at Jefferson Lab, covering a range of center-of-mass energy W from threshold to 2.15 GeV and a large range in center-of-mass polar angle. As an initial application of these data, the results have been incorporated into the J\"ulich model to examine the case for the existence of a narrow \(N^*\) resonance between 1.66 and 1.70 GeV. The addition of these data to the world database results in marked changes in the predictions for the E observable using that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.

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