Measurement of target and double-spin asymmetries for the ep - →eπ+(n) reaction in the nucleon resonance region at low Q2
- Zheng, X.
- Adhikari, K.P.
- Bosted, P.
- Deur, A.
- Drozdov, V.
- El Fassi, L.
- Kang, Hyekoo
- Kovacs, K.
- Kuhn, S.
- Long, E.
- Phillips, S.K.
- Ripani, M.
- Slifer, K.
- Smith, L.C.
- Adikaram, D.
- Akbar, Z.
- Amaryan, M.J.
- Anefalos Pereira, S.
- Asryan, G.
- Avakian, H.
- Badui, R.A.
- Ball, J.
- Baltzell, N.A.
- Battaglieri, M.
- Batourine, V.
- Bedlinskiy, I.
- Biselli, A.S.
- Briscoe, W.J.
- Bültmann, S.
- Burkert, V.D.
- Carman, D.S.
- Celentano, A.
- Chandavar, S.
- Charles, G.
- Chen, J.-P.
- Chetry, T.
- Choi, Seonho
- Ciullo, G.
- Clark, L.
- Colaneri, L.
- Cole, P.L.
- Compton, N.
- Contalbrigo, M.
- Crede, V.
- D'Angelo, A.
- Dashyan, N.
- De Vita, R.
- De Sanctis, E.
- Djalali, C.
- Dodge, G.E.
- Dupre, R.
- Egiyan, H.
- El Alaoui, A.
- Elouadrhiri, L.
- Eugenio, P.
- Fanchini, E.
- Fedotov, G.
- Fersch, R.
- Filippi, A.
- Fleming, J.A.
- Gevorgyan, N.
- Ghandilyan, Y.
- Gilfoyle, G.P.
- Giovanetti, K.L.
- Girod, F.X.
- Gleason, C.
- Golovach, E.
- Gothe, R.W.
- Griffioen, K.A.
- Guidal, M.
- Guler, N.
- Guo, L.
- Hanretty, C.
- Harrison, N.
- Hattawy, M.
- Hicks, K.
- Holtrop, M.
- Hughes, S.M.
- Ilieva, Y.
- Ireland, D.G.
- Ishkhanov, B.S.
- Isupov, E.L.
- Jenkins, D.
- Jiang, H.
- Jo, H.S.
- Joosten, S.
- Keller, D.
- Khachatryan, G.
- Khandaker, M.
- Kim, A.
- Kim, W.
- Klein, F.J.
- Kubarovsky, V.
- Lanza, L.
- Lenisa, P.
- Livingston, K.
- Macgregor, I.J.D.
- Markov, N.
- Mckinnon, B.
- Mirazita, M.
- Mokeev, V.
- Movsisyan, A.
- Munevar, E.
- Munoz Camacho, C.
- Murdoch, G.
- Nadel-Turonski, P.
- Net, L.A.
- Ni, A.
- Niccolai, S.
- Niculescu, G.
- Niculescu, I.
- Osipenko, M.
- Ostrovidov, A.I.
- Paolone, M.
- Paremuzyan, R.
- Park, K.
- Pasyuk, E.
- Peng, P.
- Pisano, S.
- Pogorelko, O.
- Price, J.W.
- Puckett, A.J.R.
- Raue, B.A.
- Rizzo, A.
- Rosner, G.
- Rossi, P.
- Roy, P.
- Sabatié, F.
- Salgado, C.
- Schumacher, R.A.
- Sharabian, Y.G.
- Skorodumina, Iu.
- Smith, G.D.
- Sokhan, D.
- Sparveris, N.
- Stankovic, I.
- Strakovsky, I.I.
- Strauch, S.
- Taiuti, M.
- Tian, Ye
- Ungaro, M.
- Voskanyan, H.
- Voutier, E.
- Walford, N.K.
- Watts, D.P.
- Wei, X.
- Weinstein, L.B.
- Wood, M.H.
- Zachariou, N.
- Zhang, J.
- Zonta, I.
DOIAbstract
We report measurements of target- and double-spin asymmetries for the exclusive channel e- p - →eπ+(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 Q2 range from 0.0065 to 0.35(GeV/c)2. The Q2 access was made possible by a custom-built Cherenkov detector that allowed the detection of electrons for scattering angles as low as 6°. These results are compared with the unitary isobar models JANR and MAID, the partial...
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