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First measurement of the helicity asymmetry E in η photoproduction on the proton
Senderovich, I. (Corresponding author) ; Morrison, B. T. ; Dugger, M. ; Ritchie, B. G. (Corresponding author) ; 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. D. ; 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.FZJ* ; 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. ; Salgado, C. ; Sabatié, F. ; Schott, D. ; Schumacher, R. A. ; Seder, E. ; Simonyan, A. ; Skorodumina, I. ; Smith, G. D. ; Sober, D. I. ; Sparveris, N. ; Stepanyan, S. ; Stoler, P. ; Strakovsky, I. I. ; Strauch, S. ; Sytnik, V. ; Tian, Y. ; 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.
2016
North-Holland Publ.
Amsterdam
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Please use a persistent id in citations: http://hdl.handle.net/2128/9905 doi:10.1016/j.physletb.2016.01.044
Abstract: Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction γp→ηpγp→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⁎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 approaches indicates these data will significantly enhance our understanding of nucleon resonances.
Contributing Institute(s):
- Experimentelle Hadronstruktur (IKP-1)
- JARA-FAME (JARA-FAME)
- JARA - HPC (JARA-HPC)
Research Program(s):
- 612 - Cosmic Matter in the Laboratory (POF3-612) (POF3-612)
- Unified analysis of photon- and pion-induced reactions in the hadron exchange picture (jikp07_20110501) (jikp07_20110501)
Appears in the scientific report
2016
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