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The resonant external field-assisted Breit-Wheeler process (Oleinikresonances) for strong electromagnetic fields with intensities less than thecritical Schwinger field has been theoretically studied. The resonantkinematics has been studied in detail. The case of high-energy initial gammaquanta and emerging ultrarelativistic electron-positron pairs is studied. Theresonant differential cross section is obtained. The generation of narrow beamsof ultrarelativistic positrons (for Channel A) and electrons (for Channel B) ispredicted with a probability significantly exceeding corresponding to thenon-resonant process.

Generation of narrow beams of ultrarelativistic positrons (electrons) in the resonant strong electromagnetic field-assisted Breit-Wheeler process