The present status and recent developments in the theory of light hydrogenic atoms,
electronic and muonic, are extensively reviewed. The discussion is based on the quantum …

This paper gives the 2002 self-consistent set of values of the basic constants and conversion
factors of physics and chemistry recommended by the Committee on Data for Science and …

Quantum bits (qubits) based on individual trapped atomic ions are a promising technology
for building a quantum computer. The elementary operations necessary to do so have been …

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 trap** …

Atoms made of a particle and an antiparticle are unstable, usually surviving less than a
microsecond. Antihydrogen, made entirely of antiparticles, is believed to be stable, and it is …

The proton charge radius has been measured since the 1950s using elastic electron–proton
scattering and ordinary hydrogen atomic spectroscopy. In 2010, a highly precise …

Physical laws are believed to be invariant under the combined transformations of charge,
parity and time reversal (CPT symmetry). This implies that an antimatter particle has exactly …

Charge, parity, and time reversal (CPT) symmetry implies that a particle and its antiparticle
have the same mass. The antiproton-to-electron mass ratio M p¯/me can be precisely …

We report a new measurement of the n= 2 Lamb shift in Muonium. Our result of 1047.2 (2.3)
stat (1.1) syst MHz comprises an order of magnitude improvement upon the previous best …

The hadronic vacuum polarization (HVP) contributions to the muon g-2 are the crucial
quantity to resolve whether new physics is present or not in the comparison between the …