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 1998 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 electrodynamics (QED) is the first successful and still the most successful quantum
field theory. Simple atoms, being essentially QED systems, allow highly accurate theoretical …

This is the first of a series of papers on a systematic application of the NRQED bound state
theory of Caswell and Lepage to higher-order radiative corrections to the hyperfine structure …

The comparison between theory and experiment of the hyperfine structure splitting and the
electronic gj factor in heavy highly charged ions provides a unique testing ground for …

The fine structure constant is one of the fundamental constants of nature characterizing the
whole range of physics including elementary particle, atomic, mesoscopic and macroscopic …

Terms contributing to the hyperfine structure of the muonium ground state at the level of few
tenths of kHz have been evaluated. The α 3 (Zα) radiative correction has been calculated …

A new result for the hadronic vacuum polarization correction to the muonium hyperfine
splitting (HFS) is presented: Δ ν (had− vp)=(0.233±0. 0 0 3) kHz. Compared with previous …

We consider hard three-loop corrections to hyperfine splitting in muonium and positronium
generated by the diagrams with closed electron loops. There are six gauge-invariant sets of …

Leading logarithmic corrections into hyperfine splitting of the Muonium ground state are
evaluated. A new term in the order α (Z α) 3 ln (Z α) n F is obtained. A status of theoretical …