Speaker
Description
The largest uncertainty in the Standard Model (SM) prediction of the anomalous magnetic moment of the Muon ($a_\mu$) is due to strong interactions, particularly the Hadronic Vacuum Polarisation (HVP). To make the SM predictions comparable in precision to the new experimental results we need to compute the HVP from first principles lattice QCD with proper handling of all possible uncertainties. One major source of large statistical uncertainties is the long-distance signal-to-noise problem in the light-quark vector-vector correlator. Since, in the long-distance regime, the light-connected vector channel is dominated by two-pion states, the signal-to-noise problem can be handled with the reconstruction of the two-pion states. In this talk, I will describe our approach to handle these two-pion states, specifically focusing on the spectrum analysis using the Generalised Eigenvalue Problem (GEVP) using various two-pion operators. I will show detailed results for one of the analysis groups for the new RBC/UKQCD long-distance data on physical point ensembles with large volumes.
