Muon g-2 and B Anomalies from Dark Matter.

Area of Science:

• Particle physics
• Cosmology
• High-energy physics

Background:

• Recent muon g-2 experiment results indicate a discrepancy with the Standard Model.
• LHCb Collaboration's R_{K} test results challenge lepton flavor universality.
• Existing models struggle to simultaneously explain these anomalies and provide a dark matter candidate.

Purpose of the Study:

• To investigate minimal field content models that can simultaneously explain the muon g-2 anomaly, R_{K} anomaly, and provide a thermal dark matter candidate.
• To explore the potential of these models to offer a natural solution to the muon g-2 discrepancy via chirally enhanced contributions.
• To assess the viability of these models against current experimental constraints and their testability at present and future colliders.

Main Methods:

• Systematic study of a set of theoretical models with minimal field content.
• Analysis of loop contributions to b→sℓℓ processes.
• Inclusion of thermal dark matter candidates.
• Consideration of chirally enhanced contributions for muon g-2.
• Evaluation of evasion strategies from direct search limits.

Main Results:

• Identified models that successfully reconcile the muon g-2 and R_{K} anomalies.
• Established the existence of thermal dark matter candidates within these models.
• Demonstrated that heavy particles and chiral enhancement allow evasion of direct search constraints.
• Confirmed the potential for testing these models at colliders and via direct-detection experiments.

Conclusions:

• Minimal field content models offer a promising framework for addressing key anomalies in particle physics and cosmology.
• These models provide a unified explanation for the muon g-2 discrepancy, B anomalies, and dark matter.
• The proposed models are experimentally testable, offering pathways for future verification or falsification.