Target and beam-target spin asymmetries in exclusive pion electroproduction for Q$^2$ > 1 GeV$^2$ . II. ep → e$\pi$$^0$p - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Physical Review C Year : 2017

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
Seungmin Kim
  • Function : Author
  • PersonId : 1007720
P P Adhikari
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N D Adikaram
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S A Akbar
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N D Amaryan
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P P Pereira
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N A Avakian
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M B Badui
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N B Balossino
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N B Battaglieri
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P E Bedlinskiy
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B B Biselli
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N B Boiarinov
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D B Briscoe
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M B Brooks
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N B Bültmann
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N B Burkert
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H A Cao
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N D Carman
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N I Celentano
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S A Chandavar
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S A Crede
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D D D 'Angelo
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P P Dashyan
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N I de Vita
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N E de Sanctis
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N D Deur
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D D Djalali
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P P Dupre
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N E Egiyan
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P E Alaoui
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Nizar Fassi
N E Elouadrhiri
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P E Eugenio
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N E Fanchini
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G G Fedotov
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N K Hafidi
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P P Hakobyan
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N A Hanretty
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N A Harrison
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N I Hattawy
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N D Heddle
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H K Hicks
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H G Hollis
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N D Holtrop
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E E Hughes
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D K Ireland
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P E Isupov
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D B Jenkins
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H A Jiang
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P P Jo
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S K Joo
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D K Keller
  • Function : Author
P P Khachatryan
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P P Khandaker
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N K Kim
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N K Klei
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D K Klein
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N K Koirala
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N K Kubarovsky
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N E Kuhn
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N I Lanza
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P P Lenisa
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L K Livingston
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L A Lu
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D K Macgregor
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N A Markov
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N D Mayer
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P E Mccracken
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M B Mckinnon
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M A Mineeva
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N I Mirazita
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N I Mokeev
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M K Montgomery
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N I Movsisyan
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P P Camacho
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M K Murdoch
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P P Nadel-Turonski
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N K Ni
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P P Niccolai
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N G Niculescu
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N I Osipenko
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S I Ostrovidov
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P P Paolone
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P P Paremuzyan
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P P Park
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P E Pasyuk
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P P Phelps
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P P Pisano
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P E Pogorelko
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P P Price
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P P Prok
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P P Protopopescu
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P P Puckett
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N B Raue
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N I Ripani
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N I Rizzo
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G K Rosner
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P P Rossi
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Philippe Roy
M A Saini
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P P Schumacher
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E E Seder
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N G Sharabian
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P P Skorodumina
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D E Smith
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D K Sokhan
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P P Sparveris
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E E Stankovic
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N A Stepanyan
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P P Stoler
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D I Strakovsky
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S A Strauch
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N I Taiuti
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Ye A Tian
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N B Torayev
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N A Ungaro
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P P Voskanyan
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P E Voutier
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N K Walford
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P E Watts
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N A Wei
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N B Weinstein
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N E Zachariou
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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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Dates and versions

cea-01535896 , version 1 (09-06-2017)

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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, 2017, 95, pp.035207. ⟨10.1103/PhysRevC.95.035207⟩. ⟨cea-01535896⟩
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