Measurement of the polarized structure functionσLT′forp(e→,e′p)π0in theΔ(1232)resonance region

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Abstract

The polarized longitudinal-transverse structure function ${\ensuremath{\sigma}}_{{\mathrm{LT}}^{\ensuremath{'}}}$ has been measured in the $\ensuremath{\Delta}(1232)$ resonance region at ${Q}^{2}=0.40$ and $0.65{\mathrm{GeV}}^{2}.$ Data for the $p(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}}p){\ensuremath{\pi}}^{0}$ 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 nonresonant amplitudes using a partial wave analysis. Comparison with previous beam asymmetry measurements at MAMI indicate a deviation from the predicted ${Q}^{2}$ dependence of ${\ensuremath{\sigma}}_{{\mathrm{LT}}^{\ensuremath{'}}}$ using recent phenomenological models.

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