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

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.

arXiv comment7 pages, 7 figures, 4 tables. Changed content. Accepted for publication in EPJA

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Cited by in corpus (35)

• Unitary Isobar Model - MAID2007
• Baryon spectroscopy
• Electromagnetic excitation of the Delta(1232)-resonance
• Electroexcitation of nucleon resonances
• Electromagnetic Excitation of Nucleon Resonances
• Chiral Effective-Field Theory in the Delta(1232) Region: Pion Electroproduction on the Nucleon
• Light baryon magnetic moments and N -> Delta gamma transition in a Lorentz covariant chiral quark approach
• D-state effects in the electromagnetic N-Delta transition
• Lowest Q^2 Measurement of the gamma*p -> Delta Reaction: Probing the Pionic Contribution
• Valence quark contribution for the gamma N -> Delta quadrupole transition extracted from lattice QCD
• Delta and Omega electromagnetic form factors in a Dyson-Schwinger/Bethe-Salpeter approach
• Hadron structure at low Q^2
• Determination of quadrupole strengths in the gamma*p-->Delta(1232) transition at Q2= 0.20 (GeV/c)2
• Measurement of the neutron charge radius and the role of its constituents
• Measurements of the gamma*p->Delta Reaction At Low Q^2: Probing the Mesonic Contribution
• Recoil Polarization Measurements for Neutral Pion Electroproduction at Q^2=1 (GeV/c)^2 Near the Delta Resonance
• Delta-baryon mass in a covariant Faddeev approach
• Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles
• Neutral Pion Electroproduction in the Resonance Region at High $Q^2$
• Study of nucleon resonances with electromagnetic interactions
• Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model
• Electroexcitation of the ${\Delta }^{+}(1232)$ at low momentum transfer
• On the two-boson exchange corrections to parity-violating elastic electron-proton scattering
• Measurements of the γ* p --> Δ(1232) reaction at low Q2
• Beam-helicity asymmetry in photon and pion electroproduction in the Delta(1232) resonance region at Q^2= 0.35 (GeV/c)^2
• Virtual Compton Scattering measurements in the ${\gamma }^{\ast }N\to \Delta$ transition
• Baryon transition form factors at the pole
• Impact of JLab data on the determination of GPDs at zero skewness and new insights from transition form factors $N\to \Delta$
• Virtual Compton Scattering measurements in the nucleon resonance region
• Nucleon-to-Delta transition form factors in chiral effective field theory using the complex-mass scheme
• Q^2-evolution of nucleon-to-resonance transition form factors in a QCD-inspired vector-meson-dominance model
• Low-Q^2 scaling behavior of the form-factor ratios for the NΔ(1232)-transition
• Gauge- and point-invariant vertices of nucleon-to-resonance interactions
• Pion electroproduction measurements in the nucleon resonance region
• Axial-vector nucleon-to-delta transition form factors using the complex-mass renormalization scheme