Measurement of the LT-asymmetry in πelectroproduction at the energy of the Δ(1232)-resonance
| Autor: | 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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| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | The European Physical Journal A. 27:91-97 |
| ISSN: | 1434-601X 1434-6001 |
| Popis: | 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 \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. |
| Databáze: | OpenAIRE |
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