85 citations · 200 across the 14 of their papers we have counts for
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Details on the Positronium Hyperfine Splitting due to Single Photon Annihilation
A. H. Hoang, P. Labelle, S. M. Zebarjad
A detailed presentation is given of the analytic calculation of the single-photon annihilation contributions to the positronium ground state hyperfine splitting to order i…
The Single Photon Annihilation Contributions to the Positronium Hyperfine Splitting to Order
A. H. Hoang, P. Labelle, S. M. Zebarjad
The single photon annihilation contributions for the positronium ground state hyperfine splitting are calculated analytically to order using NRQED. Based on intuitive phys…
NRQED and Next-to-Leading Hyperfine Splitting in Positronium
P. Labelle, S. M. Zebarjad, C. P. Burgess
We compute the next-to-leading, O(m alpha^5), contribution to the hyperfine splitting in positronium within the framework of NRQED. When applied to the ground state, our calculatio…
Derivation of the Lamb Shift using an Effective Field Theory
Patrick Labelle, S. Mohammad Zebarjad
We rederive the shift of the hydrogen levels in the non-recoil () limit using Nonrelativistic QED (NRQED), an effective field theory developed by Caswell an…
Effective field theories for QED bound states: extending Nonrelativistic QED to study retardation effects
Patrick Labelle
Nonrelativistic QED bound states are difficult to study because of the presence of at least three widely different scales: the masses, three-momenta () and kinetic energies ($…
Higher order corrections to bound state energy levels in QED: an effective field theory approach
Patrick Labelle
In T.Zhang, L.Xiao and R.Koniuk, Can. J. Phys. {\bf 70}, 670 (1992), a new method was developed to calculate energy levels in QED nonrelativistic bound states, up to order m α^5. W…