Lepton-flavor violating axions at MEG II

Abstract

We study the sensitivity of the existing MEG data to lepton flavor violating axion-like particles produced through ${\mu }^{+}\to e^{+}a\gamma$ and estimate the discovery potential for the upcoming MEG II experiment in this channel. The MEG II signal efficiency can be improved significantly if a new trigger can be implemented in a dedicated run with a reduced beam intensity. This search would establish the world leading measurement in this channel with only 1 month of data taking.

11 pages, 9 figures

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• Flavor-Violating ALPs, Electron g-2, and the Electron-Ion Collider
• Type-II Majoron Dark Matter
• Light scalar beyond the Higgs mixing limit
• Fermionic Dark Matter in Dynamical Scotogenic Model
• Same-Sign Taus Signatures of Maximally Flavor-Violating Scalars at the LHC
• Two-loop contributions of axion-like particles to electromagnetic and chromomagnetic form factors
• A Review of $\mu \to eee$, $\mu \to e\gamma$ and $\mu N\to eN$ Conversion
• Charged lepton flavor violating decays with a pair of light dark matter and muonium invisible decay
• Direct Detection of Ultralight Dark Matter via Charged Lepton Flavor Violation
• Loop-Level Lepton Flavor Violation and Diphoton Signals in the Minimal Left-Right Symmetric Model