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arXiv · 2603.03647

Searching for ALP Lepton Flavor Violation via ALP Decays at the LHC

Xiaochu Zheng·Ruitian Li·Jing Li·Hao Sun
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Abstract

In the ALP model, lepton flavor violation (LFV) can arise from off-diagonal ALP-lepton couplings ($g_{a\ell_i\ell_j}$), which are absent in the Standard Model. We focus on ALP production via gluon fusion ($pp \to a$) at the Large Hadron Collider (LHC), which dominates the ALP mass range of 5-1000 GeV due to its high cross section and manageable backgrounds. We are interested in the decay of an axion into an electron and a muon, two oppositely charged leptons of different flavors. After background suppression, we obtain the sensitivity to ALP in this mass range, finding significantly improved limits for $5 < m_a < 1000$ GeV, where SM backgrounds are suppressed. Our research is complementary with relevant studies.

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Xiaochu Zheng, Ruitian Li, Jing Li, Hao Sun. 2026-03-04. Searching for ALP Lepton Flavor Violation via ALP Decays at the LHC. https://arxiv.org/abs/2603.03647

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