The reaction p(e,ep)pi^0 has been studied at Q^2=0.2 (GeV/c)^2 in the region of W=1232 MeV. From measurements left and right of q, cross section asymmetries rho_LT have been obtained in forward kinematics rho_LT(theta_pi^0=20deg) = (-11.68 +/- 2.36_stat +/- 2.36_sys)$ and backward kinematics rho_LT(theta_pi^0=160deg) =(12.18 +/- 0.27_stat +/- 0.82_sys). Multipole ratios Re(S_1+^* M_1+)/|M_1+|^2 and Re(S_0+^* M_1+)/|M_1+|^2 were determined in the framework of the MAID2003 model. The results are in agreement with older data. The unusally strong negative Re(S_0+^* M_1+)/|M_1+|^2 required to bring also the result of Kalleicher et al. in accordance with the rest of the data is almost excluded.
Download