Prof. Hartmut Wittig, Institute for Nuclear Physics, PRISMA+ Cluster of Excellence and Helmholtz Institute, Johannes Gutenberg-Universität Mainz, spricht am Montag, den 11. November 2024, 17.00 Uhr s.t., im HS 04 (F.10.01) über "Low-Energy Puzzles and the Role of Lattice QCD"

Abstract

For many years, the anomalous magnetic moment of the muon has provided one of the most promising hints for a quantitative failure of the Standard Model, hinting at the possibility of new physics. However, recent lattice QCD calculations have challenged this scenario by providing estimates for the crucial hadronic vacuum polarisation contribution which deviate significantly from the traditional data-driven evaluation while being compatible with the direct experimental measurement. In this talk I review the current status of the muon anomalous magnetic moment and describe the enormous progress that has been achieved in lattice calculations of its hadronic contributions. In addition, I discuss how recent lattice results help in resolving the issue of discrepant measurements of the proton charge radius, which is another prominent puzzle in hadron physics.