We review the present status of the Standard Model calculation of the anomalous magnetic
moment of the muon. This is performed in a perturbative expansion in the fine-structure …

Decays of the neutral and long-lived η and η′ mesons provide a unique, flavor-conserving
laboratory to test low-energy Quantum Chromodynamics and search for new physics …

The pion-pole contribution to hadronic light-by-light scattering in the anomalous magnetic
moment of the muon (g− 2) μ is fully determined by the doubly-virtual pion transition form …

In this work we study the axial contributions to the hadronic light-by-light piece of the muon
anomalous magnetic moment. We point out some theoretical ambiguities in previous …

The π 0 pole constitutes the lowest-lying singularity of the hadronic light-by-light (HLBL)
tensor, and thus, it provides the leading contribution in a dispersive approach to HLBL …

Using an effective σ/f 0 (500) resonance, which describes the π π→ π π and γ γ→ π π
scattering data, we evaluate its contribution and the ones of the other scalar mesons to the …

We revisit the isospin-breaking and electromagnetic corrections to the decay τ-→ π-π 0 ν τ,
which allow its use as input in the two-pion contribution to the (leading-order) hadronic …

Despite recent developments, there are a number of conceptual issues on the hadronic light-
by-light (HLbL) contribution to the muon (g-2) which remain unresolved. One of the most …

We compute for the first time the τ data-driven Euclidean windows for the hadronic vacuum
polarization contribution to the muon g− 2. We show that τ-based results agree with the …

A bstract Some short-distance properties of the fourth-rank hadronic vacuum polarization
tensor are re-examined. Their consequences are critically discussed in the context of the …