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 …

Quantum Chromodynamics, the theory of quarks and gluons, whose interactions can be
described by a local SU (3) gauge symmetry with charges called “color quantum numbers” …

We reevaluate the hadronic vacuum polarisation contributions to the muon magnetic
anomaly and to the running of the electromagnetic coupling constant at the Z-boson mass …

This manual describes the Pythia event generator, the most recent version of an evolving
physics tool used to answer fundamental questions in particle physics. The program is most …

We address the contribution of the 3 π channel to hadronic vacuum polarization (HVP) using
a dispersive representation of the e+ e−→ 3 π amplitude. This channel gives the second …

We present a detailed analysis of e+ e−→ π+ π− data up to s= 1 GeV in the framework of
dispersion relations. Starting from a family of ππ P-wave phase shifts, as derived from a …

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 …

A bstract In this third paper of a series dedicated to a dispersive treatment of the hadronic
light-by-light (HLbL) tensor, we derive a partial-wave formulation for two-pion intermediate …

At low energies hadronic vacuum polarization (HVP) is strongly dominated by two-pion
intermediate states, which are responsible for about 70% of the HVP contribution to the …

The existence and properties of the sigma meson have been controversial for almost six
decades, despite playing a central role in the spontaneous chiral symmetry of QCD or in the …