Pion-pole contribution to HLbL from twisted mass lattice QCD at the physical point

Understand

We report on our computation of the pion transition form factor ${\cal F}_{P\rightarrow \gamma^*\gamma^*}$ from twisted mass lattice QCD in order to determine the numerically dominant light pseudoscalar pole contribution in the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon $a_\mu =(g-2)_\mu$.

• The pion transition form factor is computed directly at the physical point.
• We present first results for our estimate of the pion-pole contribution with kinematic setup for the pion at rest.