The double-polarization observable E was studied for the reaction gamma p -> p omega 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, omega -> pi(+)pi(-)pi(0), using a circularly polarized tagged-photon beam with energies ranging from the. 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 omega 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, pi 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 approximate to 2 GeV.

Akbar, Z., Roy, P., Park, S., Crede, V., Anisovich, A.v., Denisenko, I., et al. (2017). Measurement of the helicity asymmetry e in ω→π+π-π0 photoproduction. PHYSICAL REVIEW C, 96(6), 065209-1-065209-11 [10.1103/PhysRevC.96.065209].

Measurement of the helicity asymmetry e in ω→π+π-π0 photoproduction

D'Angelo A.
Membro del Collaboration Group
;
Rizzo A.
Membro del Collaboration Group
;
2017

Abstract

The double-polarization observable E was studied for the reaction gamma p -> p omega 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, omega -> pi(+)pi(-)pi(0), using a circularly polarized tagged-photon beam with energies ranging from the. 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 omega 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, pi 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 approximate to 2 GeV.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - Fisica Nucleare e Subnucleare
English
Con Impact Factor ISI
CLAS Collaboration
https://journals.aps.org/prc/pdf/10.1103/PhysRevC.96.065209
Akbar, Z., Roy, P., Park, S., Crede, V., Anisovich, A.v., Denisenko, I., et al. (2017). Measurement of the helicity asymmetry e in ω→π+π-π0 photoproduction. PHYSICAL REVIEW C, 96(6), 065209-1-065209-11 [10.1103/PhysRevC.96.065209].
Akbar, Z; Roy, 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; Garcon, 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; Park, K; Pasyuk, E; Phelps, W; Pogorelko, O; Price, Jw; Prok, Y; Protopopescu, D; Raue, Ba; Ripani, M; Ritchie, Bg; Rizzo, A; Rosner, G; Sabatie, F; Salgado, C; Schumacher, Ra; Sharabian, Yg; Skorodumina, I; Smith, Gd; Sober, Di; Sokhan, D; Sparveris, N; Stepanyan, S; Strakovsky, Ii; Strauch, S; Taiuti, M; Ungaro, M; Voskanyan, H; Voutier, E; Wei, X; Wood, Mh; Zachariou, N; Zana, L; Zhang, J; Zhao, Zw
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/194438
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