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    Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1 GeV2. II. ep→eπ0p TARGET and BEAM-TARGET SPIN .... II. ... P. E. BOSTED et al.

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    Genre
    Pre-print
    Date
    2017-03-20
    Author
    Bosted, PE
    Kim, A
    Adhikari, KP
    Adikaram, D
    Akbar, Z
    Amaryan, MJ
    Anefalos Pereira, S
    Avakian, H
    Badui, RA
    Ball, J
    Balossino, I
    Battaglieri, M
    Bedlinskiy, I
    Biselli, AS
    Boiarinov, S
    Briscoe, WJ
    Brooks, WK
    Bültmann, S
    Burkert, VD
    Cao, T
    Carman, DS
    Celentano, A
    Chandavar, S
    Charles, G
    Chetry, T
    Ciullo, G
    Clark, L
    Colaneri, L
    Cole, PL
    Contalbrigo, M
    Cortes, O
    Crede, V
    D'Angelo, A
    Dashyan, N
    De Vita, R
    De Sanctis, E
    Deur, A
    Djalali, C
    Dupre, R
    Egiyan, H
    El Alaoui, A
    El Fassi, L
    Elouadrhiri, L
    Eugenio, P
    Fanchini, E
    Fedotov, G
    Fegan, S
    Fersch, R
    Filippi, A
    Fleming, JA
    Forest, TA
    Fradi, A
    Ghandilyan, Y
    Gilfoyle, GP
    Girod, FX
    Glazier, DI
    Gohn, W
    Golovatch, E
    Gothe, RW
    Griffioen, KA
    Guidal, M
    Guler, N
    Hakobyan, H
    Guo, L
    Hafidi, K
    Hakobyan, H
    Hanretty, C
    Harrison, N
    Hattawy, M
    Heddle, D
    Hicks, K
    Hollis, G
    Holtrop, M
    Hughes, SM
    Ireland, DG
    Isupov, EL
    Jenkins, D
    Jiang, H
    Jo, HS
    Joo, K
    Keller, D
    Khachatryan, G
    Khandaker, M
    Kim, W
    Klei, A
    Klein, FJ
    Koirala, S
    Kubarovsky, V
    Kuhn, SE
    Lanza, L
    Lenisa, P
    Livingston, K
    Lu, HY
    MacGregor, IJD
    Markov, N
    Mayer, M
    McCracken, ME
    McKinnon, B
    Mineeva, T
    Mirazita, M
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    Subject
    nucl-ex
    nucl-ex
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/4924
    
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    DOI
    10.1103/PhysRevC.95.035207
    Abstract
    © 2017 American Physical Society. Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive π0 electroproduction reaction γ∗p→pπ0, expanding an analysis of the γ∗p→nπ+ 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<Q2<6 GeV2. Results were obtained for about 5700 bins in W, Q2, cos(θ∗), and φ∗. The beam-target asymmetries were found to generally be greater than zero, with relatively modest φ∗ dependence. The target asymmetries exhibit very strong φ∗ dependence, with a change in sign occurring between results at low W and high W, in contrast to π+ electroproduction. Reasonable agreement is found with phenomenological fits to previous data for W<1.6 GeV, but significant differences are seen at higher W. When combined with cross-sectional measurements, as well as π+ observables, the present results will provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q2, for resonances with masses as high as 2.4 GeV.
    Citation to related work
    American Physical Society (APS)
    Has part
    Physical Review C
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/4906
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