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EnglishWe report the first beam-target double-polarization asymmetries in the gamma + n(p) to pi^(-) + p(p) reaction spanning the nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several gammanN* resonance photocouplings.
| Data di pubblicazione: | 2017 | |
| Titolo: | Beam-Target Helicity Asymmetry for gamma_pol n_pol in pi^- p n the N*Resonance Region | |
| Autori: | Ho, D.; Peng, P.; Bass, C.; Collins, P.; D'Angelo, A.; Deur, A.; Fleming, J.; Hanretty, C.; Kageya, T.; Khandaker, M.; Klein, F. J.; Klempt, E.; Laine, V.; Lowry, M. M.; Lu, H.; Nepali, C.; Nikonov, V. A.; O'Connell, T.; Sandorfi, A. M.; Sarantsev, A. V.; Schumacher, R. A.; Strakovsky, I. I.; Švarc, A.; Walford, N. K.; Wei, X.; Whisnant, C. S.; Workman, R. L.; Zonta, I.; Adhikari, K. P.; Adikaram, D.; Akbar, Z.; Amaryan, M. J.; Anefalos Pereira, S.; Avakian, H.; Ball, J.; Bashkanov, M.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Biselli, A.; Briscoe, W. J.; Burkert, V. D.; Carman, D. S.; Celentano, A.; Charles, G.; Chetry, T.; Ciullo, G.; Clark, L.; Colaneri, L.; Cole, P. L.; Contalbrigo, M.; Crede, V.; Dashyan, N.; De Sanctis, E.; De Vita, R.; Djalali, C.; Dupre, R.; El Alaoui, A.; El Fassi, L.; Elouadrhiri, L.; Eugenio, P.; Fedotov, G.; Fegan, S.; Fersch, R.; Filippi, A.; Fradi, A.; Ghandilyan, Y.; Gilfoyle, G. P.; Girod, F. X.; Glazier, D. I.; Gleason, C.; Gohn, W.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Guo, L.; Hakobyan, H.; Harrison, N.; Hattawy, M.; Hicks, K.; Holtrop, M.; Hughes, S. M.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Jenkins, D.; Jiang, H.; Jo, H. S.; Joo, K.; Joosten, S.; Keller, D.; Khachatryan, G.; Kim, A.; Kim, W.; Klein, A.; Kubarovsky, V.; Kuleshov, S. V.; Lanza, L.; Lenisa, P.; Livingston, K.; Macgregor, I. J. D.; Markov, N.; McKinnon, B.; Mineeva, T.; Mokeev, V.; Montgomery, R. A.; Movsisyan, A.; Munoz Camacho, C.; Murdoch, G.; Niccolai, S.; Niculescu, G.; Osipenko, M.; Paolone, M.; Paremuzyan, R.; Park, K.; Pasyuk, E.; Phelps, W.; Pogorelko, O.; Price, J. W.; Procureur, S.; Protopopescu, D.; Ripani, M.; Riser, D.; Ritchie, B. G.; Rizzo, A.; Rosner, G.; Sabatié, F.; Salgado, C.; Sharabian, Y. G.; Skorodumina, Iu.; Smith, G. D.; Sober, D. I.; Sokhan, D.; Sparveris, N.; Strauch, S.; Tian, Ye; Torayev, B.; Ungaro, M.; Voskanyan, H.; Voutier, E.; Watts, D. P.; Wood, M. H.; Zachariou, N.; Zhang, J.; Zhao, Z. W. | |
| Rivista: | PHYSICAL REVIEW LETTERS | |
| Keywords: | Longitudinally Polarized Deuteron, Beam polarization, Particle Interactions, Particle production, Circulary Polarized Photons, Quark Model | |
| Abstract in inglese: | We report the first beam-target double-polarization asymmetries in the gamma + n(p) to pi^(-) + p(p) reaction spanning the nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several gammanN* resonance photocouplings. | |
| Digital Object Identifier (DOI): | 10.1103/PhysRevLett.118.242002 | |
| Handle: | http://hdl.handle.net/11392/2381153 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| 2017_PRL118_Beam_Target_helicity_asymmetry_CLAS_Ciullo.pdf | versione editoriale | Full text (versione editoriale) | NON PUBBLICO - Accesso privato/ristretto | Administrator Richiedi una copia |
| PhysRevLett.118.242002-accepted.pdf | post print | Post-print | PUBBLICO - Pubblico con Copyright | Open Access Visualizza/Apri |
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