First measurement of the polarization observable E in the (p)over-right-arrow((gamma)over-right-arrow, pi(+))n reaction up to 2.25 GeV

Academic Article

Abstract

  • First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E, for the reaction $\vec \gamma \vec p \to \pi^+n$, 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, J\"ulich, and SAID groups.
  • Authors

  • Strauch, S
  • Briscoe, WJ
  • Doering, M
  • Klempt, E
  • Nikonov, VA
  • Pasyuk, E
  • Roenchen, D
  • Sarantsev, AV
  • Strakovsky, I
  • Workman, R
  • Adhikari, KP
  • Adikaram, D
  • Anderson, MD
  • Pereira, S Anefalos
  • Anisovich, AV
  • Badui, RA
  • Ball, J
  • Batourine, V
  • Battaglieri, M
  • Bedlinskiy, I
  • Benmouna, N
  • Biselli, AS
  • Brock, J
  • Brooks, WK
  • Burkert, VD
  • Cao, T
  • Carlin, C
  • Carman, DS
  • Celentano, A
  • Chandavar, S
  • Charles, G
  • Colaneri, L
  • Cole, PL
  • Compton, N
  • Contalbrigo, M
  • Cortes, O
  • Crede, V
  • Dashyan, N
  • D'Angelo, A
  • De Vita, R
  • De Sanctis, E
  • Deur, A
  • Djalali, C
  • Dugger, M
  • Dupre, R
  • Egiyan, H
  • El Alaoui, A
  • El Fassi, L
  • Elouadrhiri, L
  • Eugenio, P
  • Fedotov, G
  • Fegan, S
  • Filippi, A
  • Fleming, JA
  • Forest, TA
  • Fradi, A
  • Gevorgyan, N
  • Ghandilyan, Y
  • Giovanetti, KL
  • Girod, FX
  • Glazier, DI
  • Gohn, W
  • Golovatch, E
  • Gothe, RW
  • Griffioen, KA
  • Guidal, M
  • Guo, L
  • Hafidi, K
  • Hakobyan, H
  • Hanretty, C
  • Harrison, N
  • Hattawy, M
  • Hicks, K
  • Ho, D
  • Holtrop, Maurik
  • Hughes, SM
  • Ilieva, Y
  • Ireland, DG
  • Ishkhanov, BS
  • Isupov, EL
  • Jenkins, D
  • Jiang, H
  • Jo, HS
  • Joo, K
  • Joosten, S
  • Keith, CD
  • Keller, D
  • Khachatryan, G
  • Khandaker, M
  • Kim, A
  • Kim, W
  • Klein, A
  • Klein, FJ
  • Kubarovsky, V
  • Kuhn, SE
  • Lenisa, P
  • Livingston, K
  • Lu, HY
  • MacGregor, IJD
  • Markov, N
  • McKinnon, B
  • Meekins, DG
  • Meyer, CA
  • Mokeev, V
  • Montgomery, RA
  • Moody, CI
  • Moutarde, H
  • Movsisyan, A
  • Munevar, E
  • Camacho, C Munoz
  • Nadel-Turonski, P
  • Net, LA
  • Niccolai, S
  • Niculescu, G
  • Niculescu, I
  • O'Rielly, G
  • Osipenko, M
  • Ostrovidov, AI
  • Park, K
  • Peng, P
  • Phelps, W
  • Phillips, JJ
  • Pisano, S
  • Pogorelko, O
  • Pozdniakov, S
  • Price, JW
  • Procureur, S
  • Prok, Y
  • Protopopescu, D
  • Puckett, AJR
  • Raue, BA
  • Ripani, M
  • Ritchie, BG
  • Rizzo, A
  • Rosner, G
  • Roy, P
  • Sabatie, F
  • Salgado, C
  • Schott, D
  • Schumacher, RA
  • Seder, E
  • Seely, ML
  • Senderovich, I
  • Sharabian, YG
  • Simonyan, A
  • Skorodumina, Iu
  • Smith, GD
  • Sober, DI
  • Sokhan, D
  • Sparveris, N
  • Stoler, P
  • Stepanyan, S
  • Sytnik, V
  • Taiuti, M
  • Tian, Ye
  • Trivedi, A
  • Tucker, R
  • Ungaro, M
  • Voskanyan, H
  • Voutier, E
  • Walford, NK
  • Watts, DP
  • Wei, X
  • Wood, MH
  • Zachariou, N
  • Zana, L
  • Zhang, J
  • Zhao, ZW
  • Zonta, I
  • Collaboration, CLAS
  • Status

    Publication Date

  • November 12, 2015
  • Keywords

  • Baryon spectroscopy
  • FROST experiment
  • Pion photoproduction
  • Polarization observables
  • Digital Object Identifier (doi)

    Start Page

  • 53
  • End Page

  • 58
  • Volume

  • 750