The unitary isobar model MAID has been extended and used for a partial wave analysis of pion photoand electroproduction in the resonance region W < 2 GeV. Older data from the world data base and moreâ€¦ (More)

The spin structure functions g1 and g2 have been calculated in the resonance region and for small and intermediate momentum transfer. The calculation is based on a gauge-invariant and unitary modelâ€¦ (More)

Recent experiment indicates that the behavior exhibited by the ratios E1+/M1+ and S1+/M1+ of the Î³ N â†” âˆ† transition remain small and negative for Q2 â‰¤ 4.0 GeV 2. It implies that the perturbative QCDâ€¦ (More)

Coherent pion photoproduction, d(Î³, Ï€ 0)d, is calculated in a coupled channels approach in momentum space using an elementary production operator that includes Born terms, vector meson exchange and Mâ€¦ (More)

The recoil proton polarization has been measured in the p(e-->,e'p-->)pi(0) reaction in parallel kinematics around W = 1232 MeV, Q2 = 0.121 (GeV/c)2, and epsilon = 0.718 using the polarized cwâ€¦ (More)

The diierential coincident pion electroproduction cross section in the 3 He(e,e 0 +) 3 H reaction has been measured with high resolution with the three-spectrometer setup at the Mainz Microtronâ€¦ (More)

Coherent Ï€0 photoand electroproduction on 4He and 12C nuclei is investigated in the framework of a distorted wave impulse approximation in momentum space. The elementary process is described by theâ€¦ (More)

The Dubna-Mainz-Taipei dynamical model for pion electromagnetic production, which can describe well the existing data from threshold up to 1 GeV photon lab energy, is presented and used to analyzeâ€¦ (More)

The unitary isobar model MAID2007 has been used to analyze the recent data of pion electroproduction. The model contains all four-star resonances in the region below W = 2 GeV and both single-Q and Qâ€¦ (More)