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

P Bosted; Seungmin Kim; P Adhikari; N Adikaram; S Akbar; N Amaryan; P Pereira; N Avakian; M Badui; J. Ball; N Balossino; N Battaglieri; P Bedlinskiy; B Biselli; N Boiarinov; D Briscoe; M Brooks; N Bültmann; N Burkert; H Cao; N Carman; N Celentano; S Chandavar; S Crede; D D 'Angelo; P Dashyan; N de Vita; N de Sanctis; N Deur; D Djalali; P Dupre; N Egiyan; P Alaoui; Nizar Fassi; N Elouadrhiri; P Eugenio; N Fanchini; G Fedotov; N Hafidi; P Hakobyan; N Hanretty; N Harrison; N Hattawy; N Heddle; H Hicks; H Hollis; N Holtrop; E Hughes; D Ireland; P Isupov; D Jenkins; H Jiang; P Jo; S Joo; D Keller; P Khachatryan; P Khandaker; N Kim; N Klei; D Klein; N Koirala; N Kubarovsky; N Kuhn; N Lanza; P Lenisa; L Livingston; L Lu; D Macgregor; N Markov; N Mayer; P Mccracken; M Mckinnon; M Mineeva; N Mirazita; N Mokeev; M Montgomery; N Movsisyan; P Camacho; M Murdoch; P Nadel-Turonski; N Ni; P Niccolai; N Niculescu; N Osipenko; S Ostrovidov; P Paolone; P Paremuzyan; P Park; P Pasyuk; P Phelps; P Pisano; P Pogorelko; P Price; P Prok; P Protopopescu; P Puckett; N Raue; N Ripani; N Rizzo; G Rosner; P Rossi; Philippe Roy; F. Sabatié; M Saini; P Schumacher; E Seder; N Sharabian; P Skorodumina; D Smith; D Sokhan; P Sparveris; E Stankovic; N Stepanyan; P Stoler; D Strakovsky; S Strauch; N Taiuti; Ye Tian; N Torayev; N Ungaro; P Voskanyan; P Voutier; N Walford; P Watts; N Wei; N Weinstein; N Zachariou

doi:10.1103/PhysRevC.95.035207

Journal articles

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

P Bosted ¹ Seungmin Kim P Adhikari N Adikaram S Akbar N Amaryan P Pereira N Avakian M Badui J. Ball ² N Balossino N Battaglieri P Bedlinskiy B Biselli N Boiarinov D Briscoe M Brooks N Bültmann N Burkert H Cao N Carman N Celentano S Chandavar S Crede D D 'Angelo P Dashyan N de Vita N de Sanctis N Deur D Djalali P Dupre N Egiyan P Alaoui Nizar Fassi N Elouadrhiri P Eugenio N Fanchini G Fedotov N Hafidi P Hakobyan N Hanretty N Harrison N Hattawy N Heddle H Hicks H Hollis N Holtrop E Hughes D Ireland P Isupov D Jenkins H Jiang P Jo S Joo D Keller P Khachatryan P Khandaker N Kim N Klei D Klein N Koirala N Kubarovsky N Kuhn N Lanza P Lenisa L Livingston L Lu D Macgregor N Markov N Mayer P Mccracken M Mckinnon M Mineeva N Mirazita N Mokeev M Montgomery N Movsisyan P Camacho M Murdoch P Nadel-Turonski N Ni P Niccolai N Niculescu N Osipenko S Ostrovidov P Paolone P Paremuzyan P Park P Pasyuk P Phelps P Pisano P Pogorelko P Price P Prok P Protopopescu P Puckett N Raue N Ripani N Rizzo G Rosner P Rossi Philippe Roy F. Sabatié ² M Saini P Schumacher E Seder N Sharabian P Skorodumina D Smith D Sokhan P Sparveris E Stankovic N Stepanyan P Stoler D Strakovsky S Strauch N Taiuti Ye Tian N Torayev N Ungaro P Voskanyan P Voutier N Walford P Watts N Wei N Weinstein N Zachariou

1 WM - College of William and Mary [Williamsburg]

2 DPHN - Département de Physique Nucléaire (ex SPhN)

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.

Document type :

Journal articles

Domain :

Physics [physics] / Nuclear Experiment [nucl-ex]

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https://hal-cea.archives-ouvertes.fr/cea-01535896
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Last modification on : Monday, February 10, 2020 - 6:12:46 PM
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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

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