Laser spectroscopy of muonic atoms has been recently used to probe properties of light
nuclei with unprecedented precision. We introduce nuclear effects in hydrogen-like atoms …

We review the current state of knowledge of the nucleon polarizabilities and of their role in
nucleon Compton scattering and in hydrogen spectrum. We discuss the basic concepts, the …

We present a lattice QCD calculation of the nucleon electric polarizabilities at the physical
pion mass. Our findings reveal the substantial contributions of the N π states to these …

Recent years have seen much activity in searches for dark-sector messenger particles in the
10–100 MeV mass range, especially in view of a potential new light boson conjectured by …

Interpreting measurements requires a physical theory, but the theory's accuracy may vary
across the experimental domain. To optimize experimental design, and so to ensure that the …

We review various applications of dispersion relations (DRs) to the electromagnetic structure
of hadrons. We discuss the way DRs allow one to extract information about hadron structure …

Phenomenological amplitudes obtained in partial-wave analyses (PWA) of single-pion
photoproduction are used to evaluate the contribution of this process to the Gerasimov-Drell …

We evaluate the two-photon exchange (TPE) correction to the muon–proton elastic
scattering at small momentum transfer. Besides the elastic (nucleon) intermediate state …

We performed the first simultaneous extraction of the six leading-order proton
polarizabilities. We reached this milestone thanks to both new high-quality experimental …

We examine the results of Chiral Effective Field Theory (χ EFT) for the scalar-and spin-dipole
polarisabilities of the proton and neutron, both for the physical pion mass and as a function …