  The diquark structure in baryons is commonly accepted as a reasonable
approximation which can much simplify the picture and reduce the length of
calculations. However, a diquark by no means is a point-like particle, even
though it is treated as a whole object. Therefore, to apply the diquark picture
to the phenomenological calculations, at the effective vertices for the
diquark-gauge boson interactions, suitable form factors must be introduced to
compensate the effects caused by the inner structure of the diquark. It is
crucial to derive the appropriate form factors for various interactions. In
this work, we use the Bethe-Salpeter equation to derive such form factors and
numerically evaluate their magnitudes.
