First measurement of the helicity asymmetry $E$ in $η$ photoproduction on the proton
Creators: name: Senderovich, I.
name: Morrison, B. T.
name: Dugger, M.
name: Ritchie, B. G.
name: Pasyuk, E.
name: Tucker, R.
name: Brock, J.
name: Carlin, C.
name: Keith, C. D.
name: Meekins, D. G.
name: Seely, M. L.
name: R, D.
name: D, M.
name: Collins, P.
name: Adhikari, K. P.
name: Adikaram, D.
name: Akbar, Z.
name: Anderson, M. D.
name: Pereira, S. Anefalos
name: Badui, R. A.
name: Ball, J.
name: Baltzell, N. A.
name: Battaglieri, M.
name: Batourine, V.
name: Bedlinskiy, I.
name: Biselli, A. S.
name: Boiarinov, S.
name: Briscoe, W. J.
name: Brooks, W. K.
name: Burkert, V. D.
name: Carman, D. S.
name: Celentano, A.
name: Chandavar, S.
name: Charles, G.
name: Colaneri, L.
name: Cole, P. L.
name: Contalbrigo, M.
name: Cortes, O.
name: Crede, V.
name: D'Angelo, A.
name: Dashyan, N.
name: De Vita, R.
name: De Sanctis, E.
name: Deur, A.
name: Djalali, C.
name: Dupre, R.
name: Egiyan, H.
name: Alaoui, A. El
name: Fassi, L. El
name: Fradi, A.
name: Elouadrhiri, L.
name: Eugenio, P.
name: Fedotov, G.
name: Fegan, S.
name: Filippi, A.
name: Fleming, J. A.
name: Garillon, B.
name: Ghandilyan, Y.
name: Gilfoyle, G. P.
name: Giovanetti, K. L.
name: Girod, F. -X.
name: Glazier, D. I.
name: Goetz, J. T.
name: Gohn, W.
name: Golovatch, E.
name: Gothe, R. W.
name: Griffioen, K. A.
name: Guidal, M.
name: Guo, L.
name: Hafidi, K.
name: Hakobyan, H.
name: Hanretty, C.
name: Hattawy, M.
name: Hicks, K.
name: Ho, D.
name: Holtrop, M.
name: Hughes, S. M.
name: Ilieva, Y.
name: Ireland, D. G.
name: Ishkhanov, B. S.
name: Jenkins, D.
name: Jiang, H.
name: Jo, H. S.
name: Joo, K.
name: Joosten, S.
name: Keller, D.
name: Khachatryan, G.
name: Khandaker, M.
name: Kim, A.
name: Klein, F. J.
name: Kubarovsky, V.
name: Kunkel, M. C.
name: Lenisa, P.
name: Livingston, K.
name: Lu, H. Y.
name: MacGregor, I. J. D.
name: Mattione, P.
name: McKinnon, B.
name: Meyer, C. A.
name: Mineeva, T.
name: Mokeev, V.
name: Montgomery, R. A.
name: Movsisyan, A.
name: Camacho, C. Munoz
name: Nadel-Turonski, P.
name: Net, L. A.
name: Niccolai, S.
name: Niculescu, G.
name: Niculescu, I.
name: Osipenko, M.
name: Park, K.
name: Park, S.
name: Peng, P.
name: Phelps, W.
name: Pisano, S.
name: Pogorelko, O.
name: Price, J. W.
name: Prok, Y.
name: Puckett, A. J. R.
name: Ripani, M.
name: Rizzo, A.
name: Rosner, G.
name: Roy, P.
name: Sabatie, F.
name: Salgado, C.
name: Schott, D.
name: Schumacher, R. A.
name: Seder, E.
name: Simonyan, A.
name: Skorodumina, Iu.
name: Smith, G. D.
name: Sober, D. I.
name: Sokhan, D.
name: Sparveris, N.
name: Stepanyan, S.
name: Stoler, P.
name: Strakovsky, I. I.
name: Strauch, S.
name: Sytnik, V.
name: Tian, Ye
name: Ungaro, M.
name: Voskanyan, H.
name: Voutier, E.
name: Walford, N. K.
name: Wei, X.
name: Wood, M. H.
name: Zachariou, N.
name: Zana, L.
name: Zhang, J.
name: Zhao, Z. W.
name: Zonta, I.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Results are presented for the first measurement of the double-polarization helicity asymmetry E for the $η$ photoproduction reaction $γp \rightarrow ηp$. 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 Jülich 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.