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Irreducible Three-Loop Vacuum-Polarization Correction in Muonic Bound Systems
G. S. Adkins, U. D. Jentschura
Three-loop electronic vacuum-polarization corrections due to irreducible diagrams are evaluated for two-body muonic ions with nuclear charge numbers 1 <= Z <= 6. The corrections ar…
Relativistic and Recoil Corrections to Vacuum polarization in muonic systems: Three--photon exchange, gauge invariance and numerical values
Gregory S. Adkins, Ulrich D. Jentschura
For an accurate theoretical description of muonic bound systems, it is crucial to consistently treat relativistic and recoil corrections to vacuum polarization. The one-loop vacuum…
Recoil corrections to the energy levels of hydrogenic atoms
Gregory S. Adkins, Jonathan Gomprecht, Yanxi Li +1
We have completed the calculation of pure-recoil corrections of order to Coulombic bound states of two spin-1/2 fermions without approximation in the particle masses. Our…
Positronium energy levels at order : Product contributions in the two-photon-annihilation channel
Gregory S. Adkins, Lam M. Tran, Ruihan Wang
Ongoing improvements in the measurement of positronium transition intervals motivate the calculation of the corrections to these intervals. In this work we focus on corr…
Three-photon-annihilation contributions to positronium energies at order
Gregory S. Adkins, Minji Kim, Christian Parsons +1
Positronium spectroscopy (n=1 hyperfine splitting, n=2 fine structure, and the 1S-2S interval) has reached a precision of order 1 MHz. Vigorous ongoing efforts to improve the exper…
Positronium energy levels at order : vacuum polarization corrections in the two-photon-annihilation channel
Gregory S. Adkins, Christian Parsons, M. D. Salinger +1
We have calculated all contributions to the energy levels of parapositronium at order coming from vacuum polarization corrections to processes involving virtual annihilatio…