Electromagnetic Corrections to Meson Masses and the HVP
  We present an exploratory study of the electromagnetic corrections to meson masses and the hadronic vacuum polarization using $N_f=2+1$ Domain Wall fermions. These corrections are estimated with two different approaches, a stochastic approach using $U(1)$ gauge configurations for the photon fields, and a perturbative approach through a QED perturbative expansion of the QCD+QED path integral. We compare results and statistical errors from both methods. 
Peter Boyle, Vera G\"ulpers, James Harrison, Andreas J\"uttner,   Antonin Portelli, Christopher Sachrajda
hep-lat