We calculate the high-energy amplitude in quantum electrodynamics and scalar electrodynamics, and find that the Pomeranchon is a moving Regge pole near J=3/2 when t equal to or near the two-particle threshold, and is a fixed branch point at $J=1$ for $t<~0$. This is due to the promotion from 1 to 3/2 for the power of s of the tower-diagram amplitudes at threshold. The Gribov paradox is thereby automatically resolved.
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Cheng et al. (1970) studied this question.
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