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| + | ====== TTP97-35 Lepton pair production by a high energy photon in a | ||
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| + | < | ||
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| + | field of a nucleus. By summing leading terms of | ||
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| + | 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 | ||
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| + | </ | ||
| + | |**a high energy photon in a | ||
| + | |** Phys. Rev. D 57 4025 1998 ** | | ||
| + | | {{preprints: | ||
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