Measurement of the LT-asymmetry in πelectroproduction at the energy of the Δ(1232)-resonance

Abstract.The reaction p(e, e'p)π0 has been studied at Q2 = 0.2 (GeV/c)2 in the region of W = 1232MeV. From measurements left and right of $ \vec{q}\,$, cross-section asymmetries ρLT have been obtained in forward kinematics ρLT($ \theta_{{\pi^0}}^{{cm}}$ = 20°) = (- 11.68±2.36stat±2.36sys) and backward kinematics ρLT($ \theta_{{\pi^0}}^{{cm}}$ = 160°) = (12.18±0.27stat±0.82sys) π0. Multipole ratios $ \Re${S1+ * M1+}/| M1+|2 and $ \Re${S0+ * M1+}/| M1+|2 were determined in the framework of the MAID2003 model. The results are in agreement with older data. The unusally strong negative $ \Re${S0+ * M1+}/| M1+|2 required to bring also the result of Kalleicher et al. in accordance with the rest of the data is almost excluded.