Frame Dependence of the Pair Contribution to the Pion Electromagnetic Form Factor in a Light-Front Approach

Abstract

The frame dependence of the pair-term contribution to the electromagnetic form factor of the pion is studied within the Light Front approach. A symmetric ansatz for the pion Bethe-Salpeter amplitude with a pseudo scalar coupling of the constituent to the pion field is used. In this model, the pair term vanishes for the Drell-Yan condition, while it is dominant for momentum transfer along the light-front direction.

To appear Brazilian Journal of Physics, BJP (2003), 5 pages, use revtex and epsfig, 3 figures