Current and future perspectives of positronium and muonium spectroscopy as dark sectors probe

Understand

Positronium and Muonium are purely leptonic atoms and hence free of an internal sub-structure.

• This qualifies them as potentially well suited systems to probe the existence of physics beyond the Standard Model.
• We hence carry out a comprehensive study of the sensitivity of current Positronium and Muonium precision spectroscopy to several new physics scenarios.
• By taking properly into account existing experimental and astrophysical probes, we define clear experimental targets to probe new physics via precise spectroscopy.