Speaker
Fabian Justus Frech
(Bergische Universität Wuppertal)
Description
We present a new lattice QCD calculation of the leading order hadronic vacuum polarization contribution to the muon anomalous magnetic moment $a_\mu$ with a $40\%$ reduction of the uncertainties. The short and intermediate distance window contributions are computed on 28 ensembles with 6 different lattice spacings, while the (small) long distance contributions are 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 $a_\mu$ by only $0.9$ standard deviations. This provides a remarkable validation of the standard model to $0.37$ppm.
Primary author
Fabian Justus Frech
(Bergische Universität Wuppertal)
