Measurement of the Polarized Structure Function $σ_{LT^\prime}$ for $p(\vec{e},e'p)π^o$ in the $Δ(1232)$ Resonance Region

Abstract

The polarized longitudinal-transverse structure function $σ_{LT^\prime}$ has been measured in the $Δ(1232)$ resonance region at $Q^2=0.40$ and 0.65 GeV$^2$. Data for the $p(\vec e,e'p)π^o$ reaction were taken at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) using longitudinally polarized electrons at an energy of 1.515 GeV. For the first time a complete angular distribution was measured, permitting the separation of different non-resonant amplitudes using a partial wave analysis. Comparison with previous beam asymmetry measurements at MAMI indicate a deviation from the predicted $Q^2$ dependence of $σ_{LT^{\prime}}$ using recent phenomenological models.