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

Sebastian Burri, Constantia Alexandrou, Simone Bacchio +13

We report on our computation of the pion transition form factor ${\mathcal{F}}_{P\to {\gamma }^{\ast }{\gamma }^{\ast }}$ from twisted mass lattice QCD in order to determine the numerically dominant light…