We report measurements of target- and double-spin asymmetries for the exclusive channel (e) over right arrow (p) over right arrow -> ep(+)(n) in the nucleon resonance region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). These asymmetries were extracted from data obtained using a longitudinally polarized NH3 target and a longitudinally polarized electron beam with energies 1.1, 1.3, 2.0, 2.3, and 3.0 GeV. The new results are consistent with previous CLAS publications but are extended to a low Q(2) range from 0.0065 to 0.35 (GeV/c)(2). The Q(2) access was made possible by a custom-built Cherenkov detector that allowed the detection of electrons for scattering angles as low as 6 degrees. These results are compared with the unitary isobar models JANR and MAID, the partial-wave analysis prediction from SAID, and the dynamic model DMT. In many kinematic regions our results, in particular results on the target asymmetry, help to constrain the polarization-dependent components of these models.

Zheng, X., Adhikari, K.P., Bosted, P., Deur, A., Drozdov, V., El Fassi, L., et al. (2016). Measurement of target and double-spin asymmetries for the ep - →eπ+(n) reaction in the nucleon resonance region at low Q2. PHYSICAL REVIEW C, 94(4) [10.1103/PhysRevC.94.045206].

Measurement of target and double-spin asymmetries for the ep - →eπ+(n) reaction in the nucleon resonance region at low Q2

COLANERI, LUCA;D'ANGELO, ANNALISA;PISANO, SILVIA;RIZZO, ALESSANDRO;ZONTA, IRENE
2016-10-19

Abstract

We report measurements of target- and double-spin asymmetries for the exclusive channel (e) over right arrow (p) over right arrow -> ep(+)(n) in the nucleon resonance region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). These asymmetries were extracted from data obtained using a longitudinally polarized NH3 target and a longitudinally polarized electron beam with energies 1.1, 1.3, 2.0, 2.3, and 3.0 GeV. The new results are consistent with previous CLAS publications but are extended to a low Q(2) range from 0.0065 to 0.35 (GeV/c)(2). The Q(2) access was made possible by a custom-built Cherenkov detector that allowed the detection of electrons for scattering angles as low as 6 degrees. These results are compared with the unitary isobar models JANR and MAID, the partial-wave analysis prediction from SAID, and the dynamic model DMT. In many kinematic regions our results, in particular results on the target asymmetry, help to constrain the polarization-dependent components of these models.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - Fisica Nucleare e Subnucleare
English
Con Impact Factor ISI
CLAS Collaboration
http://journals.aps.org/prc/pdf/10.1103/PhysRevC.94.045206
Zheng, X., Adhikari, K.P., Bosted, P., Deur, A., Drozdov, V., El Fassi, L., et al. (2016). Measurement of target and double-spin asymmetries for the ep - →eπ+(n) reaction in the nucleon resonance region at low Q2. PHYSICAL REVIEW C, 94(4) [10.1103/PhysRevC.94.045206].
Zheng, X; Adhikari, K; Bosted, P; Deur, A; Drozdov, V; El Fassi, L; Kang, H; Kovacs, K; Kuhn, S; Long, E; Phillips, S; Ripani, M; Slifer, K; Smith, L; Adikaram, D; Akbar, Z; Amaryan, M; Anefalos Pereira, S; Asryan, G; Avakian, H; Badui, R; Ball, J; Baltzell, N; Battaglieri, M; Batourine, V; Bedlinskiy, I; Biselli, A; Briscoe, W; Bultmann, S; Burkert, V; Carman, D; Celentano, A; Chandavar, S; Charles, G; Chen, J; Chetry, T; Choi, S; Ciullo, G; Clark, L; Colaneri, L; Cole, P; Compton, N; Contalbrigo, M; Crede, V; D'Angelo, A; Dashyan, N; De Vita, R; De Sanctis, E; Djalali, C; Dodge, G; Dupre, R; Egiyan, H; El Alaoui, A; Elouadrhiri, L; Eugenio, P; Fanchini, E; Fedotov, G; Fersch, R; Filippi, A; Fleming, J; Gevorgyan, N; Ghandilyan, Y; Gilfoyle, G; Giovanetti, K; Girod, F; Gleason, C; Golovach, E; Gothe, R; Griffioen, K; Guidal, M; Guler, N; Guo, L; Hanretty, C; Harrison, N; Hattawy, M; Hicks, K; Holtrop, M; Hughes, S; Ilieva, Y; Ireland, D; Ishkhanov, B; Isupov, E; Jenkins, D; Jiang, H; Jo, H; Joosten, S; Keller, D; Khachatryan, G; Khandaker, M; Kim, A; Kim, W; Klein, F; Kubarovsky, V; Lanza, L; Lenisa, P; Livingston, K; Macgregor, I; Markov, N; Mckinnon, B; Mirazita, M; Mokeev, V; Movsisyan, A; Munevar, E; Munoz Camacho, C; Murdoch, G; Nadel Turonski, P; Net, L; Ni, A; Niccolai, S; Niculescu, G; Niculescu, I; Osipenko, M; Ostrovidov, A; Paolone, M; Paremuzyan, R; Park, K; Pasyuk, E; Peng, P; Pisano, S; Pogorelko, O; Price, J; Puckett, A; Raue, B; Rizzo, A; Rosner, G; Rossi, P; Roy, P; Sabatie, F; Salgado, C; Schumacher, R; Sharabian, Y; Skorodumina, I; Smith, G; Sokhan, D; Sparveris, N; Stankovic, I; Strakovsky, I; Strauch, S; Taiuti, M; Tian, Y; Ungaro, M; Voskanyan, H; Voutier, E; Walford, N; Watts, D; Wei, X; Weinstein, L; Wood, M; Zachariou, N; Zhang, J; Zonta, I
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/173677
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