Constraint on parity-violating muonic forces

Area of Science:

• Particle Physics
• High Energy Physics
• Beyond Standard Model Physics

Background:

• The proton size anomaly presents a discrepancy between measurements using different probes.
• Exotic parity-violating gauge interactions have been proposed as a potential explanation.
• Leptonic kaon decays offer a sensitive probe for new physics phenomena.

Purpose of the Study:

• To constrain exotic parity-violating gauge interactions of the right-handed muon.
• To test specific models explaining the proton size anomaly.
• To limit scenarios involving invisible or long-lived gauge bosons.

Main Methods:

• Analysis of the nonobservance of missing mass events in the leptonic kaon decay K→μX.
• Application of experimental constraints to theoretical models.
• Calculation of bounds on new gauge interactions.

Main Results:

• A strong constraint is placed on exotic parity-violating gauge interactions of the right-handed muon.
• Scenarios explaining the proton size anomaly involving such new forces are constrained.
• The parameter space for invisible or long-lived gauge bosons is limited.

Conclusions:

• The study provides stringent limits on new physics beyond the Standard Model.
• The nonobservance of missing mass in kaon decays is a powerful tool for probing new forces.
• Exotic interactions involving right-handed muons are disfavored by current experimental data.