Measurement of the helicity asymmetry e in ω→π+π-π0 photoproduction
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Pre-printDate
2017-12-28Author
Akbar, ZRoy, P
Park, S
Crede, V
Anisovich, AV
Denisenko, I
Klempt, E
Nikonov, VA
Sarantsev, AV
Adhikari, KP
Adhikari, S
Amaryan, MJ
Anefalos Pereira, S
Avakian, H
Ball, J
Battaglieri, M
Batourine, V
Bedlinskiy, I
Boiarinov, S
Briscoe, WJ
Brock, J
Brooks, WK
Burkert, VD
Cao, FT
Carlin, C
Carman, DS
Celentano, A
Charles, G
Chetry, T
Ciullo, G
Clark, L
Cole, PL
Contalbrigo, M
Cortes, O
D'Angelo, A
Dashyan, N
De Vita, R
De Sanctis, E
Deur, A
Djalali, C
Dugger, M
Dupre, R
Egiyan, H
El Fassi, L
Eugenio, P
Fedotov, G
Fersch, R
Filippi, A
Fradi, A
Garçon, M
Gevorgyan, N
Giovanetti, KL
Girod, FX
Gleason, C
Gohn, W
Golovatch, E
Gothe, RW
Griffioen, KA
Guidal, M
Guo, L
Hafidi, K
Hakobyan, H
Hanretty, C
Harrison, N
Hattawy, M
Heddle, D
Hicks, K
Hollis, G
Holtrop, M
Ireland, DG
Ishkhanov, BS
Isupov, EL
Jenkins, D
Joosten, S
Keith, CD
Keller, D
Khachatryan, G
Khachatryan, M
Khandaker, M
Kim, A
Kim, W
Klein, A
Klein, FJ
Kubarovsky, V
Lanza, L
Livingston, K
MacGregor, IJD
Markov, N
McKinnon, B
Meekins, DG
Mineeva, T
Mokeev, V
Movsisyan, A
Munoz Camacho, C
Nadel-Turonski, P
Niccolai, S
Osipenko, M
Ostrovidov, AI
Paolone, M
Paremuzyan, R
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http://hdl.handle.net/20.500.12613/4831
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10.1103/PhysRevC.96.065209Abstract
© 2017 American Physical Society. The double-polarization observable E was studied for the reaction γp→pω using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility and the longitudinally polarized frozen-spin target (FROST). The observable was measured from the charged decay mode of the meson, ω→π+π-π0, using a circularly polarized tagged-photon beam with energies ranging from the ω threshold at 1.1 to 2.3 GeV. A partial-wave analysis within the Bonn-Gatchina framework found dominant contributions from the 3/2+ partial wave near threshold, which is identified with the subthreshold N(1720)3/2+ nucleon resonance. To describe the entire data set, which consisted of ω differential cross sections and a large variety of polarization observables, further contributions from other nucleon resonances were found to be necessary. With respect to nonresonant mechanisms, π exchange in the t channel was found to remain small across the analyzed energy range, while Pomeron t-channel exchange gradually grew from the reaction threshold to dominate all other contributions above W≈2 GeV.Citation to related work
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http://dx.doi.org/10.34944/dspace/4813