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 …

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 …

We consider the contribution of scalar resonances to hadronic light-by-light scattering in the
anomalous magnetic moment of the muon. While the f 0 (500) has already been addressed …

We reassess the impact of short-distance constraints for the longitudinal component of the
hadronic light-by-light amplitude on the anomalous magnetic moment of the muon, a μ=(g-2) …

The description of strong interaction physics of low-lying resonances is out of the valid range
of perturbative QCD. Chiral effective field theories (EFTs) have been developed to tackle the …

In this paper, we present a data-driven analysis of the γ γ→ D+ D− and γ γ→ D 0 D¯ 0
reactions from threshold up to 4.0 GeV in the DD¯ invariant mass. For the S-wave …

We present a theoretical study of the γ γ⁎→ π+ π−, π 0 π 0 processes from the threshold
through the f 2 (1270) region in the ππ invariant mass. We adopt the Omnès representation …

We discuss the simultaneous dispersive analyses of π K→ π K and π π→ KK ̄ scattering
data and the κ/K 0∗(700) resonance. The unprecedented statistics of present and future …

We perform a theoretical analysis of the semileptonic decays η (′)→ π 0 ℓ+ ℓ-and η′→ η
ℓ+ ℓ-, where ℓ= e, μ, via a charge-conjugation-conserving two-photon mechanism. The …