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Title MEASUREMENT OF THE TARGET SINGLE-SPIN ASYMMETRY IN QUASI-ELASTIC REGION FROM THE REACTION 3He(e,e')
Authors Yawei Zhang
JLAB number JLAB-PHY-13-1847
LANL number (None)
Other number DOE/OR/23177-3079
Document Type(s) (Thesis) 
Supported by U.S. Naval Research: No
Supported by Jefferson Lab LDRD Funding: No
  Thesis
A PHD thesis
Advisor(s) :
   Ron Gilman (Rutgers)
Publication Abstract: A measurement of the inclusive target single-spin asymmetry has been performed using the quasi-elastic 3He(e,e') reaction with a vertically polarized 3He target at Q2 values of 0.13, 0.46 and 0.97 GeV2. This asymmetry vanishes under the one photon exchange assumption. But the interference between two-photon exchange and one-photon exchange gives rise to an imaginary amplitude, so that a non-zero Ay is allowed. The experiment, conducted in Hall A of Je fferson Laboratory in 2009, used two independent spectrometers to simultaneously measure the target single-spin asymmetry. Using the e ective polarization approximation, the neutron single-spin asymmetries were extracted from the measured 3He asymmetries. The measurement is to establish a non-vanishing Ay. Non-zero asymmetries were observed at all Q2 points, and the overall precision is an order of magnitude improved over the existing proton data. The data provide new constraints on Generalized Parton Distribution (GPD) models and new information on the dynamics of the two-photon exchange process.
Experiment Numbers: E08-005
Group: Hall A
Document: pdf
DOI:
Accepted Manuscript:
Supporting Documents:
Supporting Datasets: