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Bosted, P E; Kim, Seungmin; Adhikari, P P; Adikaram, N D; Akbar, S A; Amaryan, N D; Pereira, P P; Avakian, N A; Badui, M B; Ball, J.; Balossino, N B; Battaglieri, N B; Bedlinskiy, P E; Biselli, B B; Boiarinov, N B; Briscoe, D B; Brooks, M B; Bültmann, N B; Burkert, N B; Cao, H A; Carman, N D; Celentano, N I; Chandavar, S A; Crede, S A; D 'Angelo, D D; Dashyan, P P; de Vita, N I; de Sanctis, N E; Deur, N D; Djalali, D D; Dupre, P P; Egiyan, N E; Alaoui, P E; Fassi, Nizar; Elouadrhiri, N E; Eugenio, P E; Fanchini, N E; Fedotov, G G; Hafidi, N K; Hakobyan, P P; Hanretty, N A; Harrison, N A; Hattawy, N I; Heddle, N D; Hicks, H K; Hollis, H G; Holtrop, N D; Hughes, E E; Ireland, D K; Isupov, P E; Jenkins, D B; Jiang, H A; Jo, P P; Joo, S K; Keller, D K; Khachatryan, P P; Khandaker, P P; Kim, N K; Klei, N K; Klein, D K; Koirala, N K; Kubarovsky, N K; Kuhn, N E; Lanza, N I; Lenisa, P P; Livingston, L K; Lu, L A; Macgregor, D K; Markov, N A; Mayer, N D; Mccracken, P E; Mckinnon, M B; Mineeva, M A; Mirazita, N I; Mokeev, N I; Montgomery, M K; Movsisyan, N I; Camacho, P P; Murdoch, M K; Nadel-Turonski, P P; Ni, N K; Niccolai, P P; Niculescu, N G; Osipenko, N I; Ostrovidov, S I; Paolone, P P; Paremuzyan, P P; Park, P P; Pasyuk, P E; Phelps, P P; Pisano, P P; Pogorelko, P E; Price, P P; Prok, P P; Protopopescu, P P; Puckett, P P; Raue, N B; Ripani, N I; Rizzo, N I; Rosner, G K
Physical review. C, 2017, Letnik: 95Journal Article
Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive pi(0) electroproduction reaction. gamma(*) p -> p pi(0), expanding an analysis of the. gamma(*) p -> n pi(+) reaction from the same experiment. The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic ranges covered are 1.1 < W < 3 GeV and 1 < Q(2) < 6 GeV2. Results were obtained for about 5700 bins in W, Q(2), cos(theta(*)), and phi(*). The beam-target asymmetries were found to generally be greater than zero, with relatively modest phi(*) dependence. The target asymmetries exhibit very strong phi(*) dependence, with a change in sign occurring between results at low W and high W, in contrast to pi(+) electroproduction. Reasonable agreement is found with phenomenological fits to previous data for W < 1.6 GeV, but significant differences are seen at higherW. When combined with cross-sectional measurements, as well as pi(+) observables, the present results will provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q(2), for resonances with masses as high as 2.4 GeV.
