HVP contributions to the muon (g -2) including QED corrections with twisted-mass fermions

Abstract

We present a lattice calculation of the Hadronic Vacuum Polarization (HVP) contribution of the strange and charm quarks to the anomalous magnetic moment of the muon including leading-order electromagnetic (e.m.) corrections. We employ the gauge configurations generated by the European Twisted Mass Collaboration (ETMC) with Nf = 2+1 + 1 dynamical quarks at three values of the lattice spacing (a ? 0.062,0.082,0.089 fm) with pion masses in the range Mπ ? 210 - 450 MeV. The strange and charm quark masses are tuned at their physical values. Neglecting discon-nected diagrams and after the extrapolations to the physical pion mass and to the continuum limit we obtain: aμsαem2=53.1±2.5· 10-10,aμsαem3=-0.018±0.011· 10-10 and aμcαem2=14.75±0.56· 10-10,aμcαem3=-0.030±0.013· 10-10 for the strange and charm contributions, respectively.!