Spectroscopic Bounds on New Physics

TL;DR

This paper uses atomic spectra to set constraints on hidden sector photons, highlighting the method's cleanliness and potential for future tests with muonium and muonic atoms.

Contribution

It introduces a model-independent approach using atomic spectra to constrain hidden photons and discusses future prospects with muonium and muonic atom data.

Findings

Current bounds are not improved but are clean and model-independent.

Future data could explore untested parameter space for hidden photons.

Atomic spectra provide a complementary method to existing constraints.

Abstract

We use atomic spectra to extend pure Coulomb's law tests to larger masses. We interpret these results in terms of constraints for hidden sector photons. With existing data the bounds for hidden photons are not improved. However we find that our atomic spectra bounds are an especially clean and model-independent complement to existing ones from other methods. We also show that data from future tests of true muonium and muonic atoms could produce atomic spectra bounds which probe untested parameter space.