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We evaluate the twoâ€“pion contribution to the nucleon electromagnetic form factors by use of dispersion analysis and chiral perturbation theory. After subtraction of the rhoâ€“meson component, weâ€¦ (More)

- O. Hanstein, Dieter Drechsel, Lothar Tiator
- 1996

We give predictions for the partial wave amplitudes of pion photoproduction near threshold by means of dispersion relations at xed t. The free parameters of this approach are determined by a t toâ€¦ (More)

Dispersion relations allow for a coherent description of the nucleon electromagnetic form factors measured over a large range of momentum transfer, Q2 â‰ƒ 0 . . . 35 GeV2. Including constraints fromâ€¦ (More)

We present in detail a dispersion relation formalism for virtual Compton scattering (VCS) off the proton from threshold into the âˆ†(1232)-resonance region. Such a formalism can be used as a tool toâ€¦ (More)

- Lothar Tiator, Dieter Drechsel, Sabit S. Kamalov, Mary Margaret Giannini, E. Santopinto, Antonio Vassallo
- 2003

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)

- Dieter Drechsel
- 2000

These lectures give an introduction to the structure of the nucleon as seen with the electromagnetic probe. Particular emphasis is put on the form factors, the strangeness content, Compton scatteringâ€¦ (More)

Eta photoand electroproduction on the nucleon is studied using an isobar model. The model contains Born terms, and contributions from vector meson exchanges and nucleon resonances. Our results areâ€¦ (More)

In a previous paper virtual Compton scattering off the nucleon has been investigated in the oneâ€“loop approximation of the linear sigma model in order to determine the 3 scalar generalizedâ€¦ (More)

- O. Hanstein, Dieter Drechsel, Lothar Tiator
- 1996

We have analyzed the M (3=2) 1+ and E (3=2) 1+ multipole amplitudes of pion pho-toproduction in the framework of xed-t dispersion relations. Applying the speed plot technique to our results for theseâ€¦ (More)

- Th Pospischil, Prof. Dr. D. K. Bartsch, +39 authors Morten Weis
- Physical review letters
- 2001

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)