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Measurement of the beam asymmetry Σ and the target asymmetry T in the photoproduction of ω mesons off the proton using CLAS at Jefferson Laboratory
Journal
Physical Review C
Date Issued
2018-05-04
Author(s)
Roy, P.
Akbar, Z.
Park, S.
Crede, V.
Anisovich, A. V.
Denisenko, I.
Klempt, E.
Nikonov, V. A.
Sarantsev, A. V.
Adhikari, K. P.
Adhikari, S.
Anefalos Pereira, S.
Ball, J.
Balossino, I.
Bashkanov, M.
Battaglieri, M.
Batourine, V.
Bedlinskiy, I.
Biselli, A. S.
Boiarinov, S.
Briscoe, W. J.
Brock, J.
Burkert, V. D.
Carlin, C.
Carman, D. S.
Celentano, A.
Charles, G.
Chetry, T.
Ciullo, G.
Clary, B. A.
Cole, P. L.
Contalbrigo, M.
D'Angelo, A.
Dashyan, N.
De Vita, R.
Deur, A.
Djalali, C.
Dugger, M.
Dupre, R.
El Fassi, L.
Elouadrhiri, L.
Eugenio, P.
Fedotov, G.
Fegan, S.
Filippi, A.
Fradi, A.
Gavalian, G.
Gevorgyan, N.
Gilfoyle, G. P.
Giovanetti, K. L.
Girod, F. X.
Gleason, C.
Gohn, W.
Golovatch, E.
Gothe, R. W.
Griffioen, K. A.
Guidal, M.
Guo, L.
Hafidi, K.
Hanretty, C.
Hattawy, M.
Hicks, K.
Holtrop, M.
Ilieva, Y.
Ireland, D. G.
Ishkhanov, B. S.
Isupov, E. L.
Jenkins, D.
Joo, K.
Joosten, S.
Keith, C. D.
Keller, D.
Khachatryan, G.
Khandaker, M.
Kim, A.
Kim, W.
Klein, A.
Klein, F. J.
Kubarovsky, V.
Lanza, L.
Lenisa, P.
Livingston, K.
Lu, H. Y.
Macgregor, I. J.D.
Markov, N.
Mayer, M.
McCracken, M. E.
McKinnon, B.
Meekins, D. G.
Meyer, C. A.
Meziani, Z. E.
Mokeev, V.
Montgomery, R. A.
Movsisyan, A.
Munoz Camacho, C.
Abstract
The photoproduction of ω mesons off the proton has been studied in the reaction γp → p ω using the CEBAF
Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National
Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the
decay ω → π+π−π0, using a transversely polarized target with energies ranging from just above the reaction
threshold up to 2.8 GeV. Significant nonzero values are observed for these asymmetries, reaching about 30–40%
in the third-resonance region. New measurements for the photon-beam asymmetry are also presented, which
agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional
ω photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina
framework. Significant contributions from s-channel resonance production were found in addition to t-channel
exchange processes.
Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National
Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the
decay ω → π+π−π0, using a transversely polarized target with energies ranging from just above the reaction
threshold up to 2.8 GeV. Significant nonzero values are observed for these asymmetries, reaching about 30–40%
in the third-resonance region. New measurements for the photon-beam asymmetry are also presented, which
agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional
ω photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina
framework. Significant contributions from s-channel resonance production were found in addition to t-channel
exchange processes.
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