549 citations · 2.7k across the 57 of their papers we have counts for
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hep-ph2023
Total Born cross section of -pair production by an electron in the Coulomb field of a nucleus
Roman N. Lee, Alexey A. Lyubyakin, Vladimir A. Smirnov
We calculate the total Born cross section of the -pair production by an electron in the field of a nucleus (trident process) using the modern multiloop methods. For general…
hep-ph2023
Master Integrals for Four-Loop Massless Form Factors
Roman N. Lee, Andreas von Manteuffel, Robert M. Schabinger +3
We present analytical results for all master integrals for massless three-point functions, with one off-shell leg, at four loops. Our solutions were obtained using differential equ…
hep-ph2023★ 3 cited
Two-loop corrections to Lamb shift and hyperfine splitting in hydrogen via multi-loop methods
Petr A. Krachkov, Roman N. Lee
We revisit the contributions of order and , respectively, to the Lamb shift and to the hyperfine splitting from mixed self-energy-vacuum-polarization diagr…