Article
First Measurement of the Double Spin Asymmetry in e⃗ p⃗ →e′π+n in the Resonance Region
Physical Review Letters
Document Type
Article
Article Version
Publisher's PDF
Publication Date
1-1-2002
Disciplines
Abstract
The double spin asymmetry in the ep→e′π+n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2=0.35–1.5GeV2. 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.
Comments
Copyright American Physical Society
Publisher final version available at
http://prl.aps.org/pdf/PRL/v88/i8/e082001
Published Citation
R. De Vita et al. [CLAS Collaboration], "First Measurement of the Double Spin Asymmetry in e⃗ p⃗ →e′π+n in the Resonance Region", Phys. Rev. Lett. 88, 082001 (2002).
DOI: 10.1103/PhysRevLett.88.082001
DOI
10.1103/PhysRevLett.88.082001
None
Peer Reviewed
Citation Information
R. DeVita, Angela Biselli and CLAS Collaboration. "First Measurement of the Double Spin Asymmetry in e⃗ p⃗ →e′π+n in the Resonance Region" Physical Review Letters Vol. 88 (2002) Available at: http://works.bepress.com/angela_biselli/9/