The Ward-Takahashi identity, reflecting local gauge invariance, is perturbatively verified for a boson model in light-front field theory. A careful integration over the light-front energy, corresponding to exactly taking into account pair terms, which are the contributions of the zero longitudinal-momentum mode, is crucial to obtain this result. Furthermore, the one-loop boson form factors are calculated for arbitrary off-shell momenta.
- Pub Date:
- High Energy Physics - Phenomenology
- 11 pages,include two figures (fig1.eps and fig2.eps), use latex,epsf e-mail: email@example.com, firstname.lastname@example.org and email@example.com Submitted to Few-Body Systems (1997)