Güçlu, Mehmet C.Kovankaya, G.Yılmaz, Melek2019-06-272019-06-2720052469-99262469-99342469-99262469-9934https://hdl.handle.net/20.500.12469/125https://doi.org/10.1103/PhysRevA.72.022724We solve the perturbative electron-positron pair production exactly by calculating the second-order Feynman diagrams. We compare our result with Born methods that include Coulomb corrections. We find that a small-momentum approximation is not adequate to obtain exact Coulomb corrections and higher-order terms should also be included. We also compare the impact parameter dependence cross sections.eninfo:eu-repo/semantics/openAccessArticle272WOS:00023156420011710.1103/PhysRevA.72.0227242-s2.0-27144456816Q2Q13