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Prof. Krzysztof Pachucki (University of Warsaw)21/05/2026, 14:00Talk
The finite nuclear mass $(Z\,\alpha)^2\,m/M\,E_F$ correction to the hyperfine splitting in hydrogenic systems are calculated using
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a combined relativistic heavy particle and nonrelativistic quantum electrodynamics. Obtained results are in disagreement with previous calculations
by Bodwin and Yennie [Phys. Rev. D {\bf 37}, 498 (1988)].
The comparison of improved theoretical predictions... -
Franziska Hagelstein (JGU Mainz & PSI)21/05/2026, 14:30Talk
I reexamine theory predictions of the ground-state hyperfine splitting in muonic hydrogen. A particular focus will be on proton finite-size and polarizability contributions. The common $(Z \alpha)^5$ finite-size contributions are extended up to and including $(Z \alpha)^6$. Their reanalysis based on electron-proton scattering data is presented, discussing limitations
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of the scattering data... -
Dr Vladimir Pascalutsa (University of Mainz)21/05/2026, 15:00Talk
In view of ongoing hyperfine-structure measurements by FAMU and CREMA, we investigate relativistic recoil corrections in muonic hydrogen. We particularly emphasize on relativistic contributions involving vacuum polarization and finite-size effects (see e.g., Ref. [1]), refining the theoretical description to align with the precision of current experiments.
[1]. A.Antognini, F.Hagelstein...
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Siddharth Rajamohanan (ETH Zürich)21/05/2026, 15:20Talk
Muonic hydrogen ($\mu p$) consists of a negatively charged muon bound to a proton. The large mass of the muon makes the energy levels of this atomic system sensitive to the finite size effects of the proton. The CREMA collaboration aims to measure the 1S hyperfine splitting in muonic hydrogen to $1\,$ppm relative uncertainity. This measurement can be used to determine the proton structure...
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