We highlight the progress, current status, and open challenges of QCD-driven physics, in
theory and in experiment. We discuss how the strong interaction is intimately connected to a …

This is a review of hadron structure physics from lattice QCD. Throughout this report, we
place emphasis on the contribution of lattice results to our understanding of a number of …

Starting from hyperbolic dispersion relations, we derive a system of Roy–Steiner equations
for pion Compton scattering that respects analyticity, unitarity, gauge invariance, and …

A bstract We present a comprehensive analysis of the dispersion relations for the doubly-
virtual process γ∗ γ∗→ ππ. Starting from the Bardeen-Tung-Tarrach amplitudes, we first …

The existing Chiral Perturbation Theory (ChPT) calculations at order p6 are reviewed. The
principles of ChPT and how they are used are introduced. The main part is a review of the …

We complete the recalculation of the available two-loop expressions for the reaction γγ→ ππ
in the framework of chiral perturbation theory. Here, we present the results for charged …

Abstract We reconsider Muskhelishvili–Omnès (MO) dispersive representations of photon–
photon scattering to two pions, motivated by the very high statistics results recently released …

The COMPASS collaboration at CERN has investigated pion Compton scattering, π-γ→ π-γ,
at center-of-mass energy below 3.5 pion masses. The process is embedded in the reaction …

Charged and neutral, pion and kaon electric polarizabilities are extracted from lattice QCD
using an ensemble of anisotropic gauge configurations with dynamical clover fermions. We …

We present a calculation of hadron magnetic polarizability using the techniques of lattice
QCD. This is carried out by introducing a uniform external magnetic field on the lattice and …