Results are presented for the first measurement of the double-polarization helicity asymmetry E for the eta photoproduction reaction gamma p -> 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 Julich-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 Eobservable from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances. (C) 2016 Published by Elsevier B.V.

Senderovich, I., Morrison, B.t., Dugger, M., Ritchie, B.g., Pasyuk, E., Tucker, R., et al. (2016). First measurement of the helicity asymmetry E in η photoproduction on the proton. PHYSICS LETTERS. SECTION B, 755, 64-69 [10.1016/j.physletb.2016.01.044].

First measurement of the helicity asymmetry E in η photoproduction on the proton

COLANERI, LUCA;D'ANGELO, ANNALISA;PISANO, SILVIA;RIZZO, ALESSANDRO;ZONTA, IRENE
2016-04-10

Abstract

Results are presented for the first measurement of the double-polarization helicity asymmetry E for the eta photoproduction reaction gamma p -> 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 Julich-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 Eobservable from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances. (C) 2016 Published by Elsevier B.V.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - Fisica Nucleare e Subnucleare
English
Con Impact Factor ISI
Eta photoproduction; Polarization observable; Helicity asymmetry
CLAS Collaboration
http://ac.els-cdn.com/S0370269316000617/1-s2.0-S0370269316000617-main.pdf?_tid=6ed8a5f2-0046-11e7-901e-00000aacb35e&acdnat=1488568996_687e62eaaaba40c69fd61d37a8af72bb
Senderovich, I., Morrison, B.t., Dugger, M., Ritchie, B.g., Pasyuk, E., Tucker, R., et al. (2016). First measurement of the helicity asymmetry E in η photoproduction on the proton. PHYSICS LETTERS. SECTION B, 755, 64-69 [10.1016/j.physletb.2016.01.044].
Senderovich, I; Morrison, B; Dugger, M; Ritchie, B; Pasyuk, E; Tucker, R; Brock, J; Carlin, C; Keith, C; Meekins, D; Seely, M; Rönchen, D; Döring, M; Collins, P; Adhikari, K; Adikaram, D; Akbar, Z; Anderson, M; Anefalos Pereira, S; Badui, R; Ball, J; Baltzell, N; Battaglieri, M; Batourine, V; Bedlinskiy, I; Biselli, A; Boiarinov, S; Briscoe, W; Brooks, W; Burkert, V; Carman, D; Celentano, A; Chandavar, S; Charles, G; Colaneri, L; Cole, P; 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; Fradi, A; Garillon, B; Ghandilyan, Y; Gilfoyle, G; Giovanetti, K; Girod, F; Glazier, D; Goetz, J; Gohn, W; Golovatch, E; Gothe, R; Griffioen, K; Guidal, M; Guo, L; Hafidi, K; Hakobyan, H; Hanretty, C; Hattawy, M; Hicks, K; Ho, D; Holtrop, M; Hughes, S; Ilieva, Y; Ireland, D; Ishkhanov, B; Jenkins, D; Jiang, H; Jo, H; Joo, K; Joosten, S; Keller, D; Khachatryan, G; Khandaker, M; Kim, A; Klein, F; Kubarovsky, V; Kunkel, M; Lenisa, P; Livingston, K; Lu, H; Macgregor, I; Mattione, P; Mckinnon, B; Meyer, C; Mineeva, T; Mokeev, V; Montgomery, R; Movsisyan, A; Munoz Camacho, C; Nadel Turonski, P; Net, L; Niccolai, S; Niculescu, G; Niculescu, I; Osipenko, M; Park, K; Park, S; Peng, P; Phelps, W; Pisano, S; Pogorelko, O; Price, J; Prok, Y; Puckett, A; Ripani, M; Rizzo, A; Rosner, G; Roy, P; Sabatié, F; Salgado, C; Schott, D; Schumacher, R; Seder, E; Simonyan, A; Skorodumina, I; Smith, G; Sober, D; Sparveris, N; Stepanyan, S; Stoler, P; Strakovsky, I; Strauch, S; Sytnik, V; Tian, Y; Ungaro, M; Voskanyan, H; Voutier, E; Walford, N; Wei, X; Wood, M; Zachariou, N; Zana, L; Zhang, J; Zhao, Z; Zonta, I
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/173675
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