Speaker
Alessandro Conigli
Description
We report on an ongoing effort to determine the hadronic vacuum polarization contribution to the anomalous magnetic moment of the tau from lattice QCD. The calculation is based on CLS ensembles with $N_f=2+1$ flavours of $O(a)$-improved Wilson fermions, covering five lattice spacings and a range of pion masses, including the physical point. Because of the short-distance nature of this observable, particular attention is given to the control of cutoff effects and to the continuum extrapolation, together with other sources of systematic uncertainty. We present preliminary results for the leading-order hadronic vacuum polarization contribution to the tau anomalous magnetic moment and discuss the status of the full error budget.