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Colliding light, tau g–2, and axion dark matter

by Jesse Liu (University of Cambridge)


The muon anomalous magnetic moment (g–2) exhibits tantalising tensions with the Standard Model. However, tau g–2 remains shrouded in mystery due to its short lifetime but can be 280 times more sensitive to new physics than the muonRecently, CMS and ATLAS pioneered groundbreaking tau g–2 measurements by observing tau pairs created via photon collisions in LHC heavy-ion data. Beyond colliders, limitations with existing axion searches motivate the Broadband Reflector Experiment for Axion Detection (BREAD) proposal at Fermilab. BREAD targets axion dark matter above microwave frequencies that has long eluded conventional haloscopes. These creative advances exploit interdisciplinary innovations across nuclear physics, astronomy and quantum technology.