Speaker
Laurent Lellouch
(Centre National de la Recherche Scientifique (CNRS))
Description
The experimental measurement of the anomalous contribution to the muon magnetic moment, $a_\mu=(g_\mu-2)/2$, has shown a persistent discrepancy of over 3 standard deviations with the standard model prediction since the early 2000s. At present theoretical and experimental uncertainties are close in size. However, a new experiment underway at Fermilab is aiming to reduce the uncertainty on the measurement of $a_\mu$ by a factor 4 and should release a first set of results this fall. I will present a lattice QCD calculation of the hadronic vacuum polarization contribution to this quantity that, together with the hadronic light-by-light contribution, most limits the precision of its standard model prediction.