This review consists of two parts, the phenomenology of non-relativistic potential models
and the theoretical understanding of the forces between quarks. The first part reports on the …

Positronium (Ps) is an exotic hydrogenic atom composed of an electron bound to a positron
via the Coulomb force. Being composed of two low-mass leptons, positronium is, for all …

The field of experimental positronium physics has advanced significantly in the last few
decades, with new areas of research driven by the development of techniques for trapping …

Afther the discovery of J/ψ and ψ′ mesons many other narrow resonances were found
which represent various levels of a system called charmonium. In this review theoretical …

We show that the relic abundance of thermal dark matter annihilating via a long-range
interaction, is significantly affected by the formation and decay of dark matter bound states in …

[en] This book describes the use and significance of positrons in several fieldsd of chemistry,
including chemical analysis, surface chemistry, quantum chemistry, the structure of …

We defend the applicability of asymptotically free QCD perturbation theory to the description
of multi-jet hadronic final states and investigate its predictions for the process e+ e−→ …

A potential model based on quantum-chromodynamics (QCD) considerations is developed.
The model attempts to overcome the relativistic limitations associated with earlier models by …

We report a new, more precise determination of the ground-state hyperfine-structure interval
Δ ν in positronium, which is based on extensive new data at low N 2-gas densities combined …

The development of the techniques of producing slow positron beams is traced from the
original experiments. The applications of such beams to the measurement of cross-sections …