/ nucl-ex arXiv:1711.05176

Measurement of the beam asymmetry $\Sigma$ and the target asymmetry $T$ in the photoproduction of $\omega$ mesons off the proton using CLAS at Jefferson Laboratory

Roy, P. (Yerevan Phys. Inst.) ; Akbar, Z. (Yerevan Phys. Inst.) ; Park, S. (Florida State U., Tallahassee (main)) ; Crede, V. (Florida State U., Tallahassee (main)) ; Anisovich, A.V. (Florida State U., Tallahassee (main)) ; Denisenko, I. (St. Petersburg, INP) ; Klempt, E. (Dubna, JINR) ; Nikonov, V.A. (Jefferson Lab) ; Sarantsev, A.V. (St. Petersburg, INP) ; Adhikari, K.P. (St. Petersburg, INP) ; Adhikari, S. (Old Dominion U.) ; Anefalos Pereira, S. (Florida Intl. U.) ; Ball, J. (Frascati) ; Balossino, I. (AIM, Saclay) ; Bashkanov, M. (INFN, Ferrara) ; Battaglieri, M. (Edinburgh U.) ; Batourine, V. (INFN, Genoa) ; Bedlinskiy, I. (Jefferson Lab) ; Biselli, A.S. (Moscow, ITEP) ; Boiarinov, S. (Fairfield U.) ; Briscoe, W.J. (Jefferson Lab) ; Brock, J. (George Washington U.) ; Brooks, W.K. (Jefferson Lab) ; Carlin, C. (Santa Maria U., Valparaiso) ; Carman, D.S. (Jefferson Lab) ; Celentano, A. (Jefferson Lab) ; Charles, G. (INFN, Genoa) ; Chetry, T. (Old Dominion U.) ; Ciullo, G. (Ohio U., Athens) ; Clary, B.A. (INFN, Ferrara) ; Cole, P.L. (Connecticut U.) ; Contalbrigo, M. (Idaho State U.) ; D'Angelo, A. (INFN, Ferrara) ; Dashyan, N. (Rome U., Tor Vergata) ; De Vita, R. (Yerevan Phys. Inst.) ; Deur, A. (INFN, Genoa) ; Djalali, C. (Jefferson Lab) ; Dugger, M. (South Carolina U.) ; Dupre, R. (Arizona State U.) ; El Alaoui, A. (Orsay) ; El Fassi, L. (Santa Maria U., Valparaiso) ; Elouadrhiri, L. (Mississippi State U.) ; Eugenio, P. (Jefferson Lab) ; Fedotov, G. (Florida State U., Tallahassee (main)) ; Fegan, S. (South Carolina U.) ; Filippi, A. (Glasgow U.) ; Fradi, A. (INFN, Turin) ; Gavalian, G. (Orsay) ; Gevorgyan, N. (Jefferson Lab) ; Gilfoyle, G.P. (Yerevan Phys. Inst.) ; Giovanetti, K.L. (Virginia Commonwealth U.) ; Girod, F.X. (James Madison U.) ; Gleason, C. (Jefferson Lab) ; Gohn, W. (South Carolina U.) ; Golovatch, E. (Connecticut U.) ; Gothe, R.W. (SINP, Moscow) ; Griffioen, K.A. (South Carolina U.) ; Guidal, M. (William-Mary Coll.) ; Guo, L. (Orsay) ; Hafidi, K. (Jefferson Lab) ; Hakobyan, H. (Argonne (main)) ; Hanretty, C. (Yerevan Phys. Inst.) ; Hattawy, M. (Jefferson Lab) ; Hicks, K. (Argonne (main)) ; Holtrop, M. (Ohio U., Athens) ; Ilieva, Y. (New Hampshire U.) ; Ireland, D.G. (South Carolina U.) ; Ishkhanov, B.S. (Glasgow U.) ; Isupov, E.L. (SINP, Moscow) ; Jenkins, D. (SINP, Moscow) ; Joo, K. (Virginia Tech.) ; Joosten, S. (Connecticut U.) ; Keith, C.D. (Temple U.) ; Keller, D. (Jefferson Lab) ; Khachatryan, G. (Virginia U.) ; Khandaker, M. (Yerevan Phys. Inst.) ; Kim, A. (Norfolk State U.) ; Kim, W. (Kyungpook Natl. U.) ; Klein, A. (Kyungpook Natl. U.) ; Klein, F.J. (Old Dominion U.) ; Kubarovsky, V. (Catholic U.) ; Kuleshov, S.V. (Jefferson Lab) ; Lanza, L. (Santa Maria U., Valparaiso) ; Lenisa, P. (INFN, Rome2) ; Livingston, K. (INFN, Ferrara) ; Lu, H.Y. (Glasgow U.) ; MacGregor, I.J.D. (South Carolina U.) ; Markov, N. (Glasgow U.) ; Mayer, M. (Connecticut U.) ; McCracken, M.E. (Old Dominion U.) ; McKinnon, B. (Carnegie Mellon U.) ; Meekins, D.G. (Glasgow U.) ; Meyer, C.A. (Jefferson Lab) ; Meziani, Z.E. (Carnegie Mellon U.) ; Mineeva, T. (Temple U.) ; Mokeev, V. (Santa Maria U., Valparaiso) ; Montgomery, R.A. (Jefferson Lab) ; Movsisyan, A (Glasgow U.) ; Munoz Camacho, C. (INFN, Ferrara) ; Nadel-Turonski, P. (Orsay) ; Niccolai, S. (Jefferson Lab) ; Niculescu, G. (Orsay) ; Osipenko, M. (James Madison U.) ; Ostrovidov, A.I. (INFN, Genoa) ; Paremuzyan, R. (Florida State U., Tallahassee (main)) ; Park, K. (Yerevan Phys. Inst.) ; Pasyuk, E. (Jefferson Lab) ; Phelps, E. (Jefferson Lab) ; Phelps, W. (South Carolina U.) ; Pierce, J.J. (Florida Intl. U.) ; Pogorelko, O. (Jefferson Lab) ; Price, J.W. (Moscow, ITEP) ; Procureur, S. (Cal State, Dominguez Hills) ; Prok, Y. (AIM, Saclay) ; Protopopescu, D. (Virginia U.) ; Raue, B.A. (Glasgow U.) ; Ripani, M. (Florida Intl. U.) ; Riser, D. (INFN, Genoa) ; Ritchie, B.G. (Connecticut U.) ; Rizzo, A. (Arizona State U.) ; Rosner, G. (Rome U., Tor Vergata) ; Sabatié, F. (Glasgow U.) ; Salgado, C. (AIM, Saclay) ; Schumacher, R.A. (Norfolk State U.) ; Sharabian, Y.G. (Carnegie Mellon U.) ; Skorodumina, Iu. (Jefferson Lab) ; Smith, G.D. (South Carolina U.) ; Sober, D.I. (Glasgow U.) ; Sokhan, D. (Catholic U.) ; Sparveris, N. (Glasgow U.) ; Stepanyan, S. (Temple U.) ; Strakovsky, I.I. (Jefferson Lab) ; Strauch, S. (George Washington U.) ; Taiuti, M. (South Carolina U.) ; Tan, J.A. (INFN, Genoa) ; Torayev, B. (Kyungpook Natl. U.) ; Ungaro, M. (Old Dominion U.) ; Voutier, E. (Jefferson Lab) ; Watts, D.P. (Orsay) ; Wei, X. (Edinburgh U.) ; Wood, M.H. (Jefferson Lab) ; Zachariou, N. (Canisius Coll., Buffalo) ; Zhang, J. (Edinburgh U.) ; Zhao, Z.W. (Virginia U.)

Pages: 15

Abstract: The photoproduction of $\omega$ mesons off the proton has been studied in the reaction $\gamma p\to p\,\omega$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) 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 $\omega\to\pi^+\pi^-\pi^0$, using a transversely-polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant non-zero values are observed for these asymmetries, reaching about 30-40% in the third-resonance region. New measurements for the photon-beam asymmetry, $\Sigma$, are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional $\omega$-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.

Web-Page: http://inspirehep.net/record/1636188/files/Figure-1.png; http://inspirehep.net/record/1636188/files/Figure-7.png; http://inspirehep.net/record/1636188/files/Figure-3.png; http://inspirehep.net/record/1636188/files/Figure-9.png; http://inspirehep.net/record/1636188/files/Figure-10.png; http://inspirehep.net/record/1636188/files/Figure-5.png; http://inspirehep.net/record/1636188/files/Figure-8.png; http://inspirehep.net/record/1636188/files/Figure-4.png; http://inspirehep.net/record/1636188/files/Figure-6a.png; http://inspirehep.net/record/1636188/files/Figure-6b.png; http://inspirehep.net/record/1636188/files/arXiv:1711.05176.pdf

Note: 15 pages, 10 figures; *Temporary entry*

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