Hadronic contribution to the muon g-2

Dru Renner
Jefferson Lab

The hadronic contributions to the anomalous magnetic moment of the
muon are an interesting challenge for lattice QCD, especially given a
persistent discrepancy between theory and experiment.  We have
calculated the leading-order hadronic contribution using lattice QCD.
Our focus has been on establishing what is required for a well-controlled
first-principles calculation.  This is the first calculation with dynamical
fermions to examine lattice artifacts, finite-size effects and disconnected
diagrams, essentially all the major sources of error.  We have also
studied the quark mass dependence with calculations at pion masses
ranging from 650 MeV down to 270 MeV.  I will discuss a bit of the
relevant phenomenology and then present our results.