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 — preprints:1997:ttp97-35 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== TTP97-35 Lepton pair production by a high energy photon in a   strong electromagnetic field ====== + + + Using impact-factor representation, we consider the + lepton pair production by an incident + high-energy + photon in a strong electromagnetic + field of a nucleus. By summing leading terms of + perturbation series, we obtain  a + simple formula for the amplitude, valid + to all orders in ${\cal O}(\alpha Z)$ + and arbitrary field of the nucleus. + Using these results, + we derive, in a simple manner, the results for the lepton + pair production by a virtual incident photon + in a Coulomb field. + For real incident photon our results coincide + with the known ones. + Also, a particular example of a + non-Coulomb potential is discussed in some detail. + + |**a high energy photon in a   strong electromagnetic field**  | + |** Phys. Rev. D 57 4025 1998  **  | + | {{preprints:1997:ttp97-35.pdf|PDF}} {{preprints:1997:ttp97-35.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9709352|arXiv]]   | + | |