Abstract
Beam-target double-spin asymmetries and target single-spin asymmetries in exclusive and quasiexclusive electroproduction were obtained from scattering of 1.6- to 5.7-GeV longitudinally polarized electrons from longitudinally polarized protons (for ) and deuterons (for ) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is GeV and , with good angular coverage in the forward hemisphere. The asymmetry results were divided into approximately 40 000 kinematic bins for from free protons and 15 000 bins for production from bound nucleons in the deuteron. The present results are found to be in reasonable agreement with fits to previous world data for GeV and , with discrepancies increasing at higher values of , especially for GeV. Very large target-spin asymmetries are observed for GeV. When combined with cross-section measurements, the present results can provide powerful constraints on nucleon resonance amplitudes at moderate and large values of , for resonances with masses as high as 2.3 GeV.
17 More- Received 18 April 2016
- Revised 15 August 2016
DOI:https://doi.org/10.1103/PhysRevC.94.055201
©2016 American Physical Society