From LHCbPhysics https://twitter.com/LHCbPhysics on Twitter: Test of lepton universality in beauty quark decays https://t.co/QWjHNw1i8Z. The Standard Model predicts identical electroweak interaction strengths for electron, muon and tau. The result R_K = 0.846+0.044-0.041 constitutes evidence for lepton flavour violation. https://twitter.com/LHCbPhysics/status/1374271744136118273/photo/1 https://chirp.cooleysekula.net/attachment/71475