First measurement of the helicity asymmetry E in η photoproduction on the proton
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Journal ArticleDate
2016-04-10Author
Senderovich, IMorrison, BT
Dugger, M
Ritchie, BG
Pasyuk, E
Tucker, R
Brock, J
Carlin, C
Keith, CD
Meekins, DG
Seely, ML
Rönchen, D
Döring, M
Collins, P
Adhikari, KP
Adikaram, D
Akbar, Z
Anderson, MD
Anefalos Pereira, S
Badui, RA
Ball, J
Baltzell, NA
Battaglieri, M
Batourine, V
Bedlinskiy, I
Biselli, AS
Boiarinov, S
Briscoe, WJ
Brooks, WK
Burkert, VD
Carman, DS
Celentano, A
Chandavar, S
Charles, G
Colaneri, L
Cole, PL
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, JA
Fradi, A
Garillon, B
Ghandilyan, Y
Gilfoyle, GP
Giovanetti, KL
Girod, FX
Glazier, DI
Goetz, JT
Gohn, W
Golovatch, E
Gothe, RW
Griffioen, KA
Guidal, M
Guo, L
Hafidi, K
Hakobyan, H
Hanretty, C
Hattawy, M
Hicks, K
Ho, D
Holtrop, M
Hughes, SM
Ilieva, Y
Ireland, DG
Ishkhanov, BS
Jenkins, D
Jiang, H
Jo, HS
Joo, K
Joosten, S
Keller, D
Khachatryan, G
Khandaker, M
Kim, A
Klein, FJ
Kubarovsky, V
Kunkel, MC
Lenisa, P
Livingston, K
Lu, HY
MacGregor, IJD
Mattione, P
McKinnon, B
Meyer, CA
Mineeva, T
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http://hdl.handle.net/20.500.12613/5064
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10.1016/j.physletb.2016.01.044Abstract
© 2016 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 approaches indicates these data will significantly enhance our understanding of nucleon resonances.Citation to related work
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy PhysicsADA compliance
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http://dx.doi.org/10.34944/dspace/5046
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