Abstract
The relativistic two-body bound-state form factor, recently calculated by Mankiewicz and Sawicki from a light-front formula involving analytic solutions to the Weinberg equation in a (1+1)-dimensional model field theory, is compared with the form factor obtained from the Mandelstam formula using analytic solutions to the corresponding Bethe-Salpeter equation. The results are different, since the former formula does not include the contribution of pair-creation diagrams which are included in the latter. When the pair-creation diagrams are included in the light-front formula in 1+1 dimensions, both approaches yield a numerically identical form factor, not having the strange properties described by Mankiewicz and Sawicki.
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