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19962026
most citedElectromagnetic excitation of the Delta(1232)-resonance

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physics.atom-ph2026

Hadronic vacuum polarization in hydrogen-like atoms and ions amid the interplay of recoil and finite-size effects

Franziska Hagelstein, Vadim Lensky, Bogdan Malaescu +1

Hadronic vacuum polarization (hVP) enters simple atomic systems at a level that is small yet decisive for the precision spectroscopy now underway. We evaluate the hVP contributions…