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Target and beam-target spin asymmetries in exclusive pion electroproduction for Q$^2$ > 1 GeV$^2$ . II. ep → e$\pi$$^0$p

P E Bosted 1 Seungmin Kim P P Adhikari N D Adikaram S A Akbar N D Amaryan P P Pereira N A Avakian M B Badui J. Ball 2 N B Balossino N B Battaglieri P E Bedlinskiy B B Biselli N B Boiarinov D B Briscoe M B Brooks N B Bültmann N B Burkert H A Cao N D Carman N I Celentano S A Chandavar S A Crede D D D 'Angelo P P Dashyan N I de Vita N E de Sanctis N D Deur D D Djalali P P Dupre N E Egiyan P E Alaoui Nizar Fassi N E Elouadrhiri P E Eugenio N E Fanchini G G Fedotov N K Hafidi P P Hakobyan N A Hanretty N A Harrison N I Hattawy N D Heddle H K Hicks H G Hollis N D Holtrop E E Hughes D K Ireland P E Isupov D B Jenkins H A Jiang P P Jo S K Joo D K Keller P P Khachatryan P P Khandaker N K Kim N K Klei D K Klein N K Koirala N K Kubarovsky N E Kuhn N I Lanza P P Lenisa L K Livingston L A Lu D K Macgregor N A Markov N D Mayer P E Mccracken M B Mckinnon M A Mineeva N I Mirazita N I Mokeev M K Montgomery N I Movsisyan P P Camacho M K Murdoch P P Nadel-Turonski N K Ni P P Niccolai N G Niculescu N I Osipenko S I Ostrovidov P P Paolone P P Paremuzyan P P Park P E Pasyuk P P Phelps P P Pisano P E Pogorelko P P Price P P Prok P P Protopopescu P P Puckett N B Raue N I Ripani N I Rizzo G K Rosner P P Rossi Philippe Roy F. Sabatié 2 M A Saini P P Schumacher E E Seder N G Sharabian P P Skorodumina D E Smith D K Sokhan P P Sparveris E E Stankovic N A Stepanyan P P Stoler D I Strakovsky S A Strauch N I Taiuti Ye A Tian N B Torayev N A Ungaro P P Voskanyan P E Voutier N K Walford P E Watts N A Wei N B Weinstein N E Zachariou 
Abstract : 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.
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P E Bosted, Seungmin Kim, P P Adhikari, N D Adikaram, S A Akbar, et al.. Target and beam-target spin asymmetries in exclusive pion electroproduction for Q$^2$ > 1 GeV$^2$ . II. ep → e$\pi$$^0$p. Physical Review C, American Physical Society, 2017, 95, pp.035207. ⟨10.1103/PhysRevC.95.035207⟩. ⟨cea-01535896⟩



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