Measurement of the helicity asymmetry $E$ in $ω\toπ^+π^-π^0$ photoproduction
Creators: name: Akbar, Z.
name: Roy, P.
name: Park, S.
name: Crede, V.
name: Anisovich, A. V.
name: Denisenko, I.
name: Klempt, E.
name: Nikonov, V. A.
name: Sarantsev, A. V.
name: Adhikari, K. P.
name: Adhikari, S.
name: Amaryan, M. J.
name: Pereira, S. Anefalos
name: Avakian, H.
name: Ball, J.
name: Battaglieri, M.
name: Batourine, V.
name: Bedlinskiy, I.
name: Boiarinov, S.
name: Briscoe, W. J.
name: Brock, J.
name: Brooks, W. K.
name: Burkert, V. D.
name: Cao, F. T.
name: Carlin, C.
name: Carman, D. S.
name: Celentano, A.
name: Charles, G.
name: Chetry, T.
name: Ciullo, G.
name: Clark, L.
name: Cole, P. L.
name: Contalbrigo, M.
name: Cortes, O.
name: D'Angelo, A.
name: Dashyan, N.
name: De Vita, R.
name: De Sanctis, E.
name: Deur, A.
name: Djalali, C.
name: Dugger, M.
name: Dupre, R.
name: Egiyan, H.
name: Fassi, L. El
name: Eugenio, P.
name: Fedotov, G.
name: Fersch, R.
name: Filippi, A.
name: Fradi, A.
name: Garcon, M.
name: Gevorgyan, N.
name: Giovanetti, K. L.
name: Girod, F. X.
name: Gleason, C.
name: Gohn, W.
name: Golovach, E.
name: Gothe, R. W.
name: Griffioen, K. A.
name: Guidal, M.
name: Guo, L.
name: Hafidi, K.
name: Hakobyan, H.
name: Hanretty, C.
name: Harrison, N.
name: Hattawy, M.
name: Heddle, D.
name: Hicks, K.
name: Hollis, G.
name: Holtrop, M.
name: Ireland, D. G.
name: Ishkhanov, B. S.
name: Isupov, E. L.
name: Jenkins, D.
name: Joosten, S.
name: Keith, C. D.
name: Keller, D.
name: Khachatryan, G.
name: Khachatryan, M.
name: Khandaker, M.
name: Kim, A.
name: Kim, W.
name: Klein, A.
name: Klein, F. J.
name: Kubarovsky, V.
name: Lanza, L.
name: Livingston, K.
name: MacGregor, I. J. D.
name: Markov, N.
name: McKinnon, B.
name: Meekins, D. G.
name: Mineeva, T.
name: Mokeev, V.
name: Movsisyan, A.
name: Camacho, C. Munoz
name: Nadel-Turonski, P.
name: Niccolai, S.
name: Osipenko, M.
name: Ostrovidov, A. I.
name: Paolone, M.
name: Paremuzyan, R.
name: Park, K.
name: Pasyuk, E.
name: Phelps, W.
name: Pogorelko, O.
name: Price, J. W.
name: Prok, Y.
name: Protopopescu, D.
name: Raue, B. A.
name: Ripani, M.
name: Ritchie, B. G.
name: Rizzo, A.
name: Rosner, G.
name: Sabatie, F.
name: Salgado, C.
name: Schumacher, R. A.
name: Sharabian, Y. G.
name: Skorodumina, Iu.
name: Smith, G. D.
name: Sober, D. I.
name: Sokhan, D.
name: Sparveris, N.
name: Stepanyan, S.
name: Strakovsky, I. I.
name: Strauch, S.
name: Taiuti, M.
name: Ungaro, M.
name: Voskanyan, H.
name: Voutier, E.
name: Wei, X.
name: Wood, M. H.
name: Zachariou, N.
name: Zana, L.
name: Zhang, J.
name: Zhao, Z. W.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The double-polarization observable $E$ was studied for the reaction $γp\to pω$ 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, $ω\toπ^+π^-π^0$, 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 sub-threshold $N(1720)\,3/2^+$ 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 non-resonant 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 $W \approx 2$ GeV.
description: 12 pages, 8 figures