Photoproduction of the Σ+ hyperon using linearly polarized photons with CLAS

Clark, L.; Mckinnon, B.; Ireland, D. G.; Glazier, D. I.; Livingston, K.; Rönchen, D.; Acar, A. G.; Achenbach, P.; Alvarado, J. S.; Amaryan, M. J.; Armstrong, W. R.; Atac, H.; Baashen, L.; Barion, L.; Battaglieri, M.; Benkel, B.; Benmokhtar, F.; Bianconi, A.; Biselli, A. S.; Booth, W. A.; Bossù, F.; Brinkmann, K. -Th.; Briscoe, W. J.; Brooks, W. K.; Bueltmann, S.; Cao, T.; Capobianco, R.; Carman, D. S.; Celentano, A.; Chatagnon, P.; Ciullo, G.; Cole, P. L.; Contalbrigo, M.; D'Angelo, A.; Dashyan, N.; De Vita, R.; Defurne, M.; Deur, A.; Diehl, S.; Djalali, C.; Dugger, M.; Dupre, R.; Egiyan, H.; El Alaoui, A.; El Fassi, L.; Eugenio, P.; Fegan, S.; Ferguson, R. F.; Filippi, A.; Fogler, C.; Gates, K.; Gavalian, G.; Gilfoyle, G. P.; Golubenko, A. A.; Gothe, R. W.; Guidal, M.; Hakobyan, H.; Hattawy, M.; Hauenstein, F.; Hayward, T. B.; Heddle, D.; Hobart, A.; Holtrop, M.; Isupov, E. L.; Jenkins, D.; Jiang, H.; H. S., Jo; Keller, D.; Khandaker, M.; Kim, W.; Klein, F. J.; Klimenko, V.; Kripko, A.; Kubarovsky, V.; Lanza, L.; Lenisa, P.; Li, X.; Macgregor, I. J. D.; Marchand, D.; Mascagna, V.; Matamoros, D.; Migliorati, S.; Mokeev, V.; Munoz Camacho, C.; Nadel-Turonski, P.; Neupane, K.; Niccolai, S.; Niculescu, G.; Osipenko, M.; Pandey, P.; Paolone, M.; Pappalardo, L. L.; Paremuzyan, R.; Pasyuk, E.; Paul, S. J.; Phelps, W.; Pilleux, N.; Pokhrel, M.; Polcher Rafael, S.; Prok, Y.; Reed, T.; Richards, J.; Ripani, M.; Ritchie, B. G.; Ritman, J.; Rosner, G.; Salgado, C.; Schadmand, S.; Schmidt, A.; Schumacher, R. A.; Sharabian, Y. G.; Shirokov, E. V.; Shrestha, U.; Sokhan, D.; Sparveris, N.; Spreafico, M.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Tan, J. A.; Tenorio, M.; Trotta, N.; Tyson, R.; Ungaro, M.; Venturelli, L.; Voskanyan, H.; Voutier, E.; Watts, D. P.; Wei, X.; Williams, R.; Xu, L.; Zachariou, N.; Zhao, Z. W.; Zurek, M.; Null, Null

doi:10.1103/physrevc.111.025204

Background: Measurements of the polarization observables ς,P,T,Ox,Oz for the reaction γ - p→KS0ς+ using a linearly polarized photon beam of energy 1.1 to 2.1 GeV are reported. Purpose: The measured data provide information on a channel that has not been studied extensively, but is required for a full coupled-channel analysis in the nucleon resonance region. Method: Observables have been simultaneously extracted using likelihood sampling with a Markov-Chain Monte Carlo process. Results: Angular distributions in bins of photon energy Eγ are produced for each polarization observable. T,Ox, and Oz are first time measurements of these observables in this reaction. The extraction of ς extends the energy range beyond a previous measurement. The measurement of P, the recoil polarization, is consistent with previous measurements. Conclusions: The measured data are shown to be significant enough to affect the estimation of the nucleon resonance parameters when fitted within a coupled-channels model.