99 citations · 395 across the 21 of their papers we have counts for
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hep-ph2014★ 24 cited
Positronium energy levels at order : light-by-light scattering in the two-photon-annihilation channel
Gregory S. Adkins, Christian Parsons, M. D. Salinger +2
Recent and ongoing experimental work on the positronium spectrum motivates new efforts to calculate positronium energy levels at the level of three loop corrections. We have obtain…
hep-ph2014★ 27 cited
Positronium hyperfine splitting at order : light-by-light scattering in the two-photon-exchange channel
Gregory S. Adkins, Richard N. Fell
We have calculated the contribution to the positronium hyperfine splitting at order of the light-by-light scattering process in the exchange of two photons between the elec…