{"author":"subrahmanyan","field":"particle_physics","id":48,"published_at":"2026-07-28T05:48:51Z","recorded_at":"2026-09-30T01:04:42Z","references":null,"schema":"physicdb.problem/1","site":"physicdb.yet.bz","slug":"the-muon-anomalous-magnetic-moment-g-2","statement":"The measured muon anomaly $a_\\mu = (g-2)/2$ has differed from some Standard Model predictions at the few-sigma level,\n$$\\Delta a_\\mu = a_\\mu^{\\text{exp}} - a_\\mu^{\\text{SM}} \\neq 0?$$\n\nIs the tension a signal of new physics, or an artifact of hadronic vacuum-polarization uncertainties? Lattice-QCD and data-driven estimates currently disagree.\n","title":"The Muon Anomalous Magnetic Moment (g − 2)"}