First Measurement of the Polarization Observable E in the $\vec p(\vec γ,π^+)n$ Reaction up to 2.25 GeV
Creators: name: Strauch, S.
name: Briscoe, W. J.
name: Döring, M.
name: Klempt, E.
name: Nikonov, V. A.
name: Pasyuk, E.
name: Rönchen, D.
name: Sarantsev, A. V.
name: Strakovsky, I.
name: Workman, R.
name: Adhikari, K. P.
name: Adikaram, D.
name: Anderson, M. D.
name: Pereira, S. Anefalos
name: Anisovich, A. V.
name: Badui, R. A.
name: Ball, J.
name: Batourine, V.
name: Battaglieri, M.
name: Bedlinskiy, I.
name: Benmouna, N.
name: Biselli, A. S.
name: Brock, J.
name: Brooks, W. K.
name: Burkert, V. D.
name: Cao, T.
name: Carlin, C.
name: Carman, D. S.
name: Celentano, A.
name: Chandavar, S.
name: Charles, G.
name: Colaneri, L.
name: Cole, P. L.
name: Compton, N.
name: Contalbrigo, M.
name: Cortes, O.
name: Crede, V.
name: Dashyan, N.
name: D'Angelo, A.
name: De Vita, R.
name: De Sanctis, E.
name: Deur, A.
name: Djalali, C.
name: Dugger, M.
name: Dupre, R.
name: Egiyan, H.
name: Alaoui, A. El
name: Fassi, L. El
name: Elouadrhiri, L.
name: Eugenio, P.
name: Fedotov, G.
name: Fegan, S.
name: Filippi, A.
name: Fleming, J. A.
name: Forest, T. A.
name: Fradi, A.
name: Gevorgyan, N.
name: Ghandilyan, Y.
name: Giovanetti, K. L.
name: Girod, F. X.
name: Glazier, D. I.
name: Gohn, W.
name: Golovatch, 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: Hicks, K.
name: Ho, D.
name: Holtrop, M.
name: Hughes, S. M.
name: Ilieva, Y.
name: Ireland, D. G.
name: Ishkhanov, B. S.
name: Isupov, E. L.
name: Jenkins, D.
name: Jiang, H.
name: Jo, H. S.
name: Joo, K.
name: Joosten, S.
name: Keith, C. D.
name: Keller, D.
name: Khachatryan, G.
name: Khandaker, M.
name: Kim, A.
name: Kim, W.
name: Klein, A.
name: Klein, F. J.
name: Kubarovsky, V.
name: Kuhn, S. E.
name: Lenisa, P.
name: Livingston, K.
name: Lu, H. Y.
name: MacGregor, I . J . D.
name: Markov, N.
name: McKinnon, B.
name: Meekins, D. G.
name: Meyer, C. A.
name: Mokeev, V.
name: Montgomery, R. A.
name: Moody, C. I.
name: Moutarde, H.
name: Movsisyan, A
name: Munevar, E.
name: Camacho, C. Munoz
name: Nadel-Turonski, P.
name: Net, L. A.
name: Niccolai, S.
name: Niculescu, G.
name: Niculescu, I.
name: Osipenko, M.
name: Ostrovidov, A. I.
name: Park, K.
name: Peng, P.
name: Phelps, W.
name: Phillips, J. J.
name: Pisano, S.
name: Pogorelko, O.
name: Pozdniakov, S.
name: Price, J. W.
name: Procureur, S.
name: Prok, Y.
name: Protopopescu, D.
name: Puckett, A. J. R.
name: Raue, B. A.
name: Ripani, M.
name: Ritchie, B. G.
name: Rizzo, A.
name: Rosner, G.
name: Roy, P.
name: Sabatié, F.
name: Salgado, C.
name: Schott, D.
name: Schumacher, R. A.
name: Seder, E.
name: Seely, M. L.
name: Senderovich, I
name: Sharabian, Y. G.
name: Simonyan, A.
name: Skorodumina, Iu.
name: Smith, G. D.
name: Sober, D. I.
name: Sokhan, D.
name: Sparveris, N.
name: Stoler, P.
name: Stepanyan, S.
name: Sytnik, V.
name: Taiuti, M.
name: Tian, Ye
name: Trivedi, A.
name: Tucker, R.
name: Ungaro, M.
name: Voskanyan, H.
name: Voutier, E.
name: Walford, N. K.
name: Watts, D. P.
name: Wei, X.
name: Wood, M. H.
name: Zachariou, N.
name: Zana, L.
name: Zhang, J.
name: Zhao, Z. W.
name: Zonta, I.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E, for the reaction $\vec γ\vec p \to π^+n$, has been measured using a circularly polarized tagged-photon beam, with energies from 0.35 to 2.37 GeV. The final-state pions were detected with the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson National Accelerator Facility. These polarization data agree fairly well with previous partial-wave analyses at low photon energies. Over much of the covered energy range, however, significant deviations are observed, particularly in the high-energy region where high-L multipoles contribute. The data have been included in new multipole analyses resulting in updated nucleon resonance parameters. We report updated fits from the Bonn-Gatchina, Jülich, and SAID groups.
description: 6 pages, 3 figures