Sprecher
Beschreibung
In exotic atoms, one or more electrons have been replaced by a heavier exotic particle like a muon or antiproton. These systems are ideal candidates to test strong-field QED since the particle orbits much closer to the nucleus due to its higher mass, thus experiencing stronger fields. Many upcoming experiments will use this fact to improve QED tests in high-$Z$ systems. However, to effectively use the measurements that will be produced by such experiments, matching theoretical predictions are necessary. We present improved calculations of the Lamb shift in heavy electronic, muonic, and antiprotonic atoms that are non-perturbative in the coupling parameter $\alpha Z$. In particular, we will focus on the all-order one- and two-loop vacuum polarization as it is strongly enhanced compared to the self-energy in exotic systems.
