High precision calculation of the hadronic vacuum polarisation contribution to the muon anomaly

We present a new lattice QCD calculation of the leading order hadronic vacuum polarization contribution to the muon anomalous magnetic moment a_μ. We reduce uncertainties compared to our earlier computation by $40%$, arXiv:2002.12347. We perform simulations on finer lattices allowing for an even more accurate continuum extrapolation. We also include a small, long-distance contribution obtained using input from experiments in a low-energy regime where they all agree. Combined with other standard model contributions our result leads to a prediction that differs from the measurement of a_μ by only 0.9 standard deviations. This provides a remarkable validation of the standard model to 0.37ppm.