Abstract
The measurement of the strong-interaction effects in pionic hydrogen gives access to fundamental properties of the pion–nucleon interaction. Methods developed within the framework of Heavy-Baryon Chiral Perturbation Theory allow calculations with an accuracy of a few per cent, which should be tested by experiment.
Techniques advanced for recent experiments on the precision spectroscopy of X-rays from antiprotonic and pionic atoms will be used in a new series of measurements for pionic hydrogen. The aim is to achieve finally an accuracy of 0.2% for the hadronic shift ∈1s and most important of about 1% for the broadening Γ1s .
An essential part of the experimental program is an improved understanding of the atomic cascade. At first, the value of ∈1s has to be proven not to be influenced by molecular formation. Secondly, a more accurate determination of Γ1s requires a detailed study of Coulomb deexcitation.
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Anagnostopoulos, D.F., Biri, S., Borchert, G. et al. The Pionic Hydrogen Experiment at PSI. Hyperfine Interactions 138, 131–140 (2001). https://doi.org/10.1023/A:1020815220597
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DOI: https://doi.org/10.1023/A:1020815220597