Physics – Atomic Physics
Scientific paper
1998-09-15
Physics
Atomic Physics
submitted to proceedings of Workshop in Sadansky on "QED and Physics of the Vacuum", D. Baklanov (ed.) (1998)
Scientific paper
The energy levels of the muonium ($\mu^+ e^-$) atom, which consists of two ''point-like'' leptonic particles, can be calculated to very high accuracy in the framework of bound state Quantum Electrodynamics (QED), since there are no complications due to internal nuclear structure and size which is the case for all atoms and ions of natural isotopes including atomic hydrogen. The ground state hyperfine splitting and the 1s-2s energy interval can provide both tests of QED theory and determinations of fundamental constants like the muon mass $m_{\mu}$ and the fine structure constant $\alpha$. The excellent understanding of the electromagnetic binding in the muonium atom allows in particular testing fundamental physical laws like lepton number conservation in searches for muonium to antimuonium conversion and probing the nature of the muon as a heavy leptonic object. New measurements on the ground state hyperfine splitting and the 1s-2s transition are discussed.
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