Abstract
Conformal on-shell wave functions are derived for spin-1/2 particle decaying virtually in spin 0 and spin 1/2. The relation to the off-shell vertex function is worked out and it is shown that shadow singularities are shifted tod′=5/2,d′ being the dimension of the particle field. The obtained wave functions are used to compute the conformal contribution to the form factors. Ford′ 5/2 the appearance of infra-red divergences enhances this contribution above the dimensional bound and the enhancement is computed in terms of the dimensions of the various fields.
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