First measurement of the helicity asymmetry E in η photoproduction on the proton
- Senderovich, I.
- Morrison, B.T.
- Dugger, M.
- Ritchie, B.G.
- Pasyuk, E.
- Tucker, R.
- Brock, J.
- Carlin, C.
- Keith, C.D.
- Meekins, D.G.
- Seely, M.L.
- Rönchen, D.
- Döring, M.
- Collins, P.
- Adhikari, K.P.
- Adikaram, D.
- Akbar, Z.
- Anderson, M
- Anefalos Pereira, S.
- Badui, R.A.
- Ball, J.
- Baltzell, N.A.
- Battaglieri, M.
- Batourine, V.
- Bedlinskiy, I.
- Biselli, A.S.
- Boiarinov, S.
- Briscoe, W.J.
- Brooks, W.K.
- Burkert, V.D.
- Carman, D.S.
- Celentano, A.
- Chandavar, S.
- Charles, G.
- Colaneri, L.
- Cole, P.L.
- Contalbrigo, M.
- Cortes, O.
- Credé, V.
- D'Angelo, A.
- Dashyan, N.
- De Vita, R.
- De Sanctis, E.
- Deur, A.
- Djalali, C.
- Dupre, R.
- Egiyan, H.
- El Alaoui, A.
- El Fassi, L.
- Elouadrhiri, L.
- Eugenio, P.
- Fedotov, G.
- Fegan, S.
- Filippi, A.
- Fleming, J.A.
- Fradi, A.
- Garillon, B.
- Ghandilyan, Y.
- Gilfoyle, G.P.
- Giovanetti, K.L.
- Girod, F.X.
- Glazier, D.I.
- Goetz, J.T.
- Gohn, W.
- Golovatch, E.
- Gothe, R.W.
- Griffioen, K.A.
- Guidal, M.
- Guo, L.
- Hafidi, K.
- Hakobyan, H.
- Hanretty, C.
- Hattawy, M.
- Hicks, K.
- Ho, D.
- Holtrop, M.
- Hughes, S.M.
- Ilieva, Y.
- Ireland, D.G.
- Ishkhanov, B.S.
- Jenkins, D.
- Jiang, H.
- Jo, H.S.
- Joo, K.
- Joosten, S.
- Keller, D.
- Khachatryan, G.
- Khandaker, M.
- Kim, A.
- Klein, F.J.
- Kubarovsky, V.
- Kunkel, M.C.
- Lenisa, P.
- Livingston, K.
- Lu, H.Y.
- MacGregor, I.J.D.
- Mattione, P.
- McKinnon, B.
- Meyer, C.A.
- Mineeva, T.
- Mokeev, V.
- Montgomery, R.A.
- Movsisyan, A.
- Munoz Camacho, C.
- Nadel-Turonski, P.
- Net, L.A.
- Niccolai, S.
- Niculescu, G.
- Niculescu, I.
- Osipenko, M.
- Park, K.
- Park, S.
- Peng, P.
- Phelps, W.
- Pisano, S.
- Pogorelko, O.
- Price, J.W.
- Prok, Y.
- Puckett, A.J.R.
- Ripani, M.
- Rizzo, A.
- Rosner, G.
- Roy, P.
- Sabatié, F.
- Salgado, C.
- Schott, D.
- Schumacher, R.A.
- Seder, E.
- Simonyan, A.
- Skorodumina, Iu.
- Smith, G.D.
- Sober, D.I.
- Sparveris, N.
- Stepanyan, S.
- Stoler, P.
- Strakovsky, I.I.
- Strauch, S.
- Sytnik, V.
- Tian, Ye
- Ungaro, M.
- Voskanyan, H.
- Voutier, E.
- Walford, N.K.
- Wei, X.
- Wood, M.H.
- Zachariou, N.
- Zana, L.
- Zhang, J.
- Zhao, Z.W.
- Zonta, I.
DOIAbstract
Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction γp→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–Bonn 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 from that model. Further comparison with several theoretical approach...
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