Speaker
Description
We give an update on progress by the Fermilab Lattice, HPQCD, and MILC collaborations on computing isospin-breaking corrections for the hadronic vacuum polarization (HVP) contribution to the muon's anomalous magnetic moment. These effects, specifically electromagnetic corrections and strong-isospin breaking (SIB) corrections, are small but important to determine accurately for our sub-percent level, complete lattice calculation of the HVP, as discussed in a companion talk. All calculations are performed on 2+1+1 flavor HISQ ensembles; the forthcoming SIB results will include new results on ensembles with a~0.076 and 0.057fm, as well as improved statistics compared with our previous published results. In addition, we discuss a method for using charge spurion analysis to analyze the chiral dependence of electromagnetic effects.