Formfactor

This electromagnetic structure caused by the cloud of virtual states in the transition region is characterized by a specific formfactor, which is called the transition formfactor.

Dilepton spectroscopy could also give interesting information on the electromagnetic formfactor for baryons where the situation is more complicated since for these the time-like sector is not accessible below an invariant mass of 2mp;

Using the known values of the nucleon formfactors the pion formfactor can in principle be determined as the only free parameter in a fit to the cross section of electro-π⁺-production.

All diagrams in a given-order formfactor are similar. They all are integrals over the momentum circulating in the loop, and the integrands are identical.

The general trend one has found in varying the off-shell behaviour of the two-nucleon interaction while keeping the on-shell properties the same is that though one can in principle increase the binding energy, the dip in the formfactor moves at the same time to larger momentum transfer and as a result the discrepancy in the secondary maximum increases.

We calculate the threshold singularities in one-dimensional models using the universal low-energy formfactors obtained in the framework of the non-linear Luttinger liquid model.

the surface area of the ellipsoid fitted to the measured length and breadth is divided by the formfactor to estimate the surface area of the irregular object

The formfactor was chosen because it is sensitive to both the elongation of a region and the jaggedness of its border.