SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 4: Quantum Effects (QED) (joint session Q/A)

A 4.6: Talk

Monday, March 6, 2023, 12:15–12:30, F442

Constraints on Beyond-Standard-Model Particles from the Muon’s Anomalous Magnetic Moment — •Clive Reese and Stefan Yoshi Buhmann — University of Kassel, Germany

While the Standard Model is incredibly successful in predicting the anomalous magnetic moment of the electron, the same theory fails at predicting the anomalous magnetic moment of the muon a_µ. Recent experimental results by Fermilab reinforce the discrepancy, displaying a deviation of 4.2 σ [1]. Particles Beyond Standard Model (BSM) can contribute to a_µ due to one-loop corrections and thus explain the anomaly.

In our work we assume one fermion and one (pseudo-)scalar particle in the interaction, where either one of the particles or both can be BSM particles. We calculate the contribution to a_µ in dependence of the masses, coupling constants and electric charges. Considering experimental and theoretical limits it turns out that chiral couplings constitute good candidates, while uncharged fermions like neutrinos cannot explain the anomaly. A scalar in PeV-Scale is too heavy to be detected, but an theoretically explain the anomaly.

[1] B. Abi et al.: ’Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm’, Phys. Rev. Lett. 126, 141801 (2021)