Transverse-Longitudinal Asymmetry in the QuasielasticHe→3(e→, e′)Reaction

The transverse-longitudinal asymmetry $A_{T{L}^{\prime }}$ in ${}_{}{}^3{}_{}{}^{}\overrightarrow{\mathrm{He}}(\overrightarrow{e}, e^{\prime })$ quasielastic scattering at momentum transfer $Q^2=0.14\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ has been measured to be 1.52 ± 0.55(stat) ± 0.15(syst)%. The plane wave impulse approximation (PWIA) prediction for this measurement ranges from 2.1% to 2.9%, where the variation is due to uncertainty in the initial state wave function, nucleon form factors, and off-shell prescription. The data may suggest a suppression with respect to the PWIA, which has also been observed for the unpolarized longitudinal response function.