Prof. Dr. Hartmut Wittig

T a l k : 18. June 2026 

The Puzzles of the Muon Anomalous Magnetic Moment or A Tale of Two Tensions

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 computing the contributions from the strong interaction in lattice QCD.

Literature:
[1] R. Aliberti et al., The anomalous magnetic moment of the muon in the Standard Model: an update; Phys. Rept. 1143 (2025) 1, arXiv:2505.21476 [hep-ph]
[2] H. Wittig, Lepton anomalous magnetic moments: Theory, arXiv:2512.18382 [hep-ph]
[3] F. Jegerlehner, The Anomalous Magnetic Moment of the Muon, Springer Tracts Mod. Phys. 274 (2017) 1-693