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state Positronium for Precision Physics: an Ultrafine Splitting at
Henry Lamm
An "ultrafine" splitting in positronium between the spin-singlet state and the spin-average of the spin-triplet states is shown to arise only at order . The QED predicti…
Some radiative corrections to the hyperfine splitting of true muonium: two-photon-exchange contributions
Yao Ji, Henry Lamm
We consider a set of radiative contributions from one-loop lepton vacuum polarization to the hyperfine splitting of true muonium. Improving previous results, we obtain values for t…
Hadronic Vacuum Polarization in True Muonium
Henry Lamm
The leading-order hadronic vacuum polarization contribution to the hyperfine splitting of true muonium is reevaluated in two ways. The first considers a more complex pionic form fa…
Hyperfine Splitting in True Muonium to : Two Photon Annihilation Contribution from Other Flavors
Yao Ji, Henry Lamm
The two-photon-annihilation contribution to the true muonium hyperfine splitting arising from and loops is obtained analytically at order . The contribution to the…