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

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

2005-07-08

arxiv.org/abs/nucl-ex/0507014v2

Eur.Phys.J. A27 (2006) 91-97

Physics

Nuclear Physics

Nuclear Experiment

7 pages, 7 figures, 4 tables. Changed content. Accepted for publication in EPJA

Scientific paper

10.1140/epja/i2005-10212-2

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.

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