The anomalous magnetic moment of the muon and its hadronic contributions
The anomalous magnetic moment of the muon is one of the most accurately measured quantities in particle physics and also one of the very few to exhibit a significant discrepancy with respect to its Standard Model determination. In this talk, I will focus on its hadronic contributions, which dominate the theory uncertainty. In particular, the hadronic light-by-light scattering corrections are emerging as a potential roadblock for a more precise evaluation of the muon g-2. I will present basic features and numerical results of a novel theoretical framework, which by exploiting the general principles of unitarity and analyticity, paves the way for the first data-driven determination of the hadronic light-by-light contribution with controlled uncertainties.