Although the neutron (n) does not carry a total electric charge, its charge distribution represented in momentum space by the first electromagnetic form factor, F (n) 1 (q 2), leads to a spin independent electric potential. We calculate the first order electromagnetic corrections to the binding energy of a one neutron halo nucleus by evaluating the potential between the neutron and the charged ...

We calculate the electromagnetic form factor of the pion in quenched lattice QCD. The non-perturbatively improved Sheikoleslami-Wohlert lattice action is used together with the consistently O(a) improved current. We calculate the pion form factor for masses down to mπ = 360 M eV , extract the charge radius, and extrapolate toward the physical pion mass. In the second part, we discuss results fo...

The pion electromagnetic form factor is investigated by using the dispersion relation with the superconvergence condition, which was proposed to synthesize the vector meson dominance model and QCD. The absorptive part is given as an addition of the resonance and the QCD terms, the latter being parametrized so as to realize the prediction of perturbative QCD. The experimental data are analyzed a...

We use recent data on K + → π + e + e − , together with known values for the pion form factor, to derive experimental values for the kaon electromagnetic form factor for 0 < q 2 < 0.125 (GeV/c) 2. The results are then compared with predictions of the Vector-Meson-Dominance model, which gives a good fit to the experimental results.

We present an alternative parameterization of the quark-diquark model of baryons which particularly takes care of the most recent proton electric form-factor data from the E136 experiment at SLAC. In addition to electromagnetic form factors of the nucleon, for which good agreement with data is achieved, we discuss the weak axial vector form factor of the nucleon as well as electromagnetic form ...

We investigate the imaginary parts of the nucleon electromagnetic and axial form factors close to threshold in the framework of heavy baryon chiral perturbation theory. For the isovector electromagnetic form factors, we recover the well known strong enhancement near threshold. For the isoscalar ones, we show that there is no visible enhancement due to the three–pion continuum. This justifies th...