1. Measurement of the LT-asymmetry in ��^0 electroproduction at the energy of the ��(1232) resonance
- Author
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Elsner, D., S��le, A., Barneo, P., Bartsch, P., Baumann, D., Bermuth, J., B��hm, R., Bosnar, D., Ding, M., Distler, M., Drechsel, D., Ewald, I., Friedrich, J., Friedrich, J. M., Gr��zinger, S., Jennewein, P., Kamalov, S., Klein, F. H., Kohl, M., Krygier, K. W., Merkel, H., Merle, P., M��ller, U., Neuhausen, R., Pospischil, Th., Potokar, M., Rosner, G., Schmieden, H., Str��hle, M. Seimetz O., Tiator, L., Walcher, Th., and Weis, M.
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FOS: Physical sciences ,Nuclear Experiment (nucl-ex) - Abstract
The reaction p(e,e'p)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 ��_LT have been obtained in forward kinematics ��_LT(��_��^0=20deg) = (-11.68 +/- 2.36_stat +/- 2.36_sys)$ and backward kinematics ��_LT(��_��^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., 7 pages, 7 figures, 4 tables. Changed content. Accepted for publication in EPJA
- Published
- 2005
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