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Measurement of the LT-asymmetry in π^0 electroproduction at the energy of the Δ(1232) resonance

D. Elsner·A. Süle·P. Barneo·P. Bartsch·D. Baumann·J. Bermuth·R. Böhm·D. Bosnar·M. Ding·M. Distler·D. Drechsel·I. Ewald·J. Friedrich·J. M. Friedrich·S. Grözinger·P. Jennewein·S. Kamalov·F. H. Klein·M. Kohl·K. W. Krygier·H. Merkel·P. Merle·U. Müller·R. Neuhausen·Th. Pospischil·M. Potokar·G. Rosner·H. Schmieden·M. Seimetz O. Strähle·L. Tiator·Th. Walcher·M. Weis
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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 ρ_LT have been obtained in forward kinematics ρ_LT(θ_π^0=20deg) = (-11.68 +/- 2.36_stat +/- 2.36_sys)$ and backward kinematics ρ_LT(θ_π^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.

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D. Elsner, A. Süle, P. Barneo, P. Bartsch, D. Baumann, J. Bermuth, R. Böhm, D. Bosnar, M. Ding, M. Distler, D. Drechsel, I. Ewald, J. Friedrich, J. M. Friedrich, S. Grözinger, P. Jennewein, S. Kamalov, F. H. Klein, M. Kohl, K. W. Krygier, H. Merkel, P. Merle, U. Müller, R. Neuhausen, Th. Pospischil, M. Potokar, G. Rosner, H. Schmieden, M. Seimetz O. Strähle, L. Tiator, Th. Walcher, M. Weis. 2006-01-28. Measurement of the LT-asymmetry in π^0 electroproduction at the energy of the Δ(1232) resonance. https://doi.org/10.1140/epja%2Fi2005-10212-2

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