CORDIS Project
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This project aims to resolve the 'proton size puzzle' by conducting precision spectroscopy of helium ions. It seeks to improve measurements of the alpha particle radius and compare quantum electrodynamics in electronic and muonic systems.
A key component of the Standard Model is Quantum Electrodynamics (QED). QED explains e.g. the anomalous magnetic moment of the electron and small energy shifts in the energy structure of atoms and molecules due to vacuum fluctuations.
After decades of precision measurements, especially laser spectroscopy in atomic hydrogen, QED is considered the most successful and best-tested theory in physics.
However, in 2010 precision spectroscopy in muonic-hydrogen (where the electron is replaced with a muo…
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