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A: Fachverband Atomphysik

A 35: Precision Spectroscopy of atoms and ions

A 35.1: Poster

Donnerstag, 14. März 2019, 16:15–18:15, S Fobau Physik

Axion-induced Lamb-shift in atomic and muonic hydrogen — •Alina Golub, Selym Villalba-Chávez, and Carsten Müller — Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, Deutschland

Vacuum polarization effects due to hypothetical axion-like particles, which are predicted in some extensions of the standard model, are considered. The self-energy operator of the electromagnetic field is determined with an accuracy of second-order in the axion-diphoton coupling. The result is utilized for establishing the axion-modified Coulomb potential of a static pointlike charge. In connection, the plausible distortion of the Lamb-shift in hydrogenlike atoms is established and the scopes for searching axion-like particles in high-precision atomic spectroscopy are investigated. Particularly, we show that these hypothetical degrees of freedom are ruled out as plausible candidates for explaining the proton radius anomaly in muonic hydrogen [1].

[1] Axion-modified photon propagator, Coulomb potential, and Lamb-shift; S. Villalba-Chavez, A. Golub, C. Müller accepted for publication in Phys. Rev. D [arXiv:1806.10940v1]