Physical Review Letters
The double spin asymmetry in the →e→p → e' π+n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2 = 0.35-1.5 GeV2. Data were taken at Jefferson Lab with the CLAS detector using a 2.6 GeV polarized electron beam incident on a polarized solid NH3 target. Comparison with predictions of phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistent with a faster rise with Q2 of the helicity asymmetry A1 for the F15(1680) resonance than expected from the analysis of the unpolarized data.
Original Publication Citation
De Vita, R., Dodge, G.E., Hyde-Wright, C.E., Kuhn, S.E., Weinstein, L.B., Zhou, Z., et al., CLAS Collaboration (2002). First measurement of the double spin asymmetry in →e→p → e ‘π⁺ in the resonance region. Physical Review Letters, 88(8), 1-6, Article 082001. https://doi.org/10.1103/PhysRevLett.88.082001
0000-0003-1582-2376 (Dodge), 0000-0001-7282-8120 (Hyde-Wright), 0000-0003-2243-6836 (Kuhn), 0000-0001-5416-2900 (Weinstein)
Dodge, G. E.; Dharmawardane, K. V.; Forest, T. A.; Hyde-Wright, C. E.; Klein, A.; Kuhn, S. E.; Niyazov, R. A.; Weinstein, L. B.; Yun, J.; et. al.; and CLAS Collaboration, "First Measurement of the Double Spin Asymmetry in →e→p → e ‘π⁺ in the Resonance Region" (2002). Physics Faculty Publications. 503.