Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-10-23
Phys.Rev. D67 (2003) 054014
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 10 figures, 1 Table, RevTex4
Scientific paper
10.1103/PhysRevD.67.054014
We apply the light-front reduction of the Bethe-Salpeter equation to matrix elements of the electromagnetic current between bound states. Using a simple (1+1)-dimensional model to calculate form factors, we focus on two cases. In one case, the interaction is dominated by a term instantaneous in light-cone time. Here effects of higher Fock states are negligible and the form factor can be effectively expressed using non-wave function vertices and crossed interactions. If the interaction is not instantaneous, non-wave function vertices are replaced by contributions from higher Fock states. These higher Fock components arise from the covariant formalism via the energy poles of the Bethe-Salpeter vertex and the electromagnetic vertex. The replacement of non-wave function vertices in time-ordered perturbation theory is a theorem which directly extends to generalized parton distributions, e.g., in (3+1) dimensions.
Miller Gary A.
Tiburzi Brian C.
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