Strategy to measure tau g-2 via photon fusion in LHC proton collisions

Measuring the tau-lepton () anomalous magnetic moment a_= (g_-2) /2 in photon fusion production () tests foundational Standard Model principles. However, eludes observation in LHC proton collisions (pp) despite enhanced new physics sensitivity from higher-mass reach than existing probes. We propose a novel strategy to measure pp () p by introducing the overlooked electron-muon signature with vertex isolation for signal extraction. Applying the effective field theory of dipole moments, we estimate 95% CL sensitivity of -0. 0092<a_<0. 011 assuming 300 fb^-1 luminosity and 5% systematics. This fourfold improvement beyond existing constraints opens a crucial path to unveiling new physics imprinted in tau-lepton dipoles.