International Conference on Precision Physics of Simple Atomic Systems

Session

Session 17

22 May 2026, 09:00

Festsaal, Theatersaal (ÖAW)

42. Precision Multi Lepton–Proton Scattering and the Proton Radius Puzzle

Dvir Yaari (The Hebrew University of Jerusalem)

22/05/2026, 09:00

Talk

The MUon Scattering Experiment (MUSE) at the Paul Scherrer Institute (PSI) is designed to address the "proton radius puzzle" through high-precision measurements of elastic lepton-proton scattering. By utilizing a mixed secondary beam in the $\pi$M1 channel, MUSE performs simultaneous measurements of electron-proton ($e^{\pm}p$), muon-proton ($\mu^{\pm}p$), and pion-proton ($\pi^{\pm}p$)...

37. Ab initio QED calculations of Li-like ions and nuclear radii determinations

Vladimir Yerokhin (Max Planck Institute for Nuclear Physics)

22/05/2026, 09:30

Talk

I report on recent advances in ab initio QED theory of the 2pj-2s transition energies in Li-like ions and present the most accurate calculations to date for the Li isoelectronic sequence with Z >= 10 [1]. Improved convergence of the calculations was achieved by employing the extended Furry picture, which includes the screening potential nonperturbatively, in addition to the nuclear binding...

50. Spin-1 Quantum Electrodynamics and New Physics

Prof. Ulrich Jentschura (Missouri S&T University)

22/05/2026, 10:00

The bound system of a deuteron and its antiparticle (deuteronium) appears to be an almost ideal candidate for the study of higher-order corrections to the electromagnetic interactions of spin-1 particles. As shown in the preprints arXiv:2506.15974 and arXiv:2602.04743 (accepted for publication in Physical Review Research and Physical Review D), the fine and hyperfine structure of deuteronium...