Journal article

Axionlike Particles, Lepton-Flavor Violation, and a New Explanation of a_{μ} and a_{e}.

Martin Bauer, Matthias Neubert, Sophie Renner, Marvin Schnubel, Andrea Thamm

Physical Review Letters | American Physical Society | Published : 2020

Abstract

Axionlike particles (ALPs) with lepton-flavor-violating couplings can be probed in exotic muon and tau decays. The sensitivity of different experiments depends strongly on the ALP mass and its couplings to leptons and photons. For ALPs that can be resonantly produced, the sensitivity of three-body decays such as μ→3e and τ→3μ exceeds by many orders of magnitude that of radiative decays like μ→eγ and τ→μγ. Searches for these two types of processes are therefore highly complementary. We discuss experimental constraints on ALPs with a single dominant lepton-flavor-violating coupling. Allowing for one or more such couplings offers qualitatively new ways to explain the anomalies related to the ma..

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University of Melbourne Researchers

Grants

Awarded by Cluster of Excellence Precision Physics, Fundamental Interactions, and Structure of Matter - German Research Foundation (DFG) within the German Excellence Strategy


Awarded by German Federal Ministry for Education and Research (BMBF)


Funding Acknowledgements

We thank the Mainz Institute for Theoretical Physics (MITP) for hospitality and inspiring discussions while conducting this research. This work has been supported by the Cluster of Excellence Precision Physics, Fundamental Interactions, and Structure of Matter (PRISMAthorn EXC 2118/1) funded by the German Research Foundation (DFG) within the German Excellence Strategy (Project ID No. 39083149), and by Grant No. 05H18UMKB1 of the German Federal Ministry for Education and Research (BMBF).