Precision Measurement of the Lamb Shift in Muonium

Area of Science:

• Atomic Physics
• Quantum Electrodynamics
• Fundamental Symmetries

Background:

• The Lamb shift in Muonium is a sensitive probe of quantum electrodynamics (QED) and potential new physics.
• Previous measurements had limited precision, restricting tests of fundamental symmetries and theories beyond the Standard Model.

Purpose of the Study:

• To perform a new, high-precision measurement of the n=2 Lamb shift in Muonium.
• To set improved limits on Lorentz and CPT violation in the muonic sector.
• To investigate potential new physics that could explain the muon g-2 anomaly.

Main Methods:

• High-precision laser spectroscopy of Muonium.
• Advanced data analysis techniques to minimize statistical and systematic uncertainties.

Main Results:

• A new measurement of the n=2 Lamb shift in Muonium: 1047.2(2.3)_{stat}(1.1)_{syst} MHz.
• This result represents an order of magnitude improvement in precision over previous measurements.
• The measured value agrees with theoretical predictions within one standard deviation.

Conclusions:

• The improved precision allows for stringent constraints on Lorentz and CPT symmetry violations in the muonic sector.
• The results provide a new avenue to search for physics beyond the Standard Model that could be responsible for the muon g-2 anomaly.