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Measurement of target and double-spin asymmetries for the e- p- →eπ+(n) reaction in the nucleon resonance region at low Q2
Zheng, X Adhikari, KP Bosted, P Deur, A Drozdov, V El Fassi, L Kang, H Kovacs, K Kuhn, S Long, E
Zheng, X
Adhikari, KP
Bosted, P
Deur, A
Drozdov, V
El Fassi, L
Kang, H
Kovacs, K
Kuhn, S
Long, E
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Pre-print
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2016-10-19
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10.1103/PhysRevC.94.045206
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© 2016 American Physical Society. 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-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.
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Physical Review C
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