Speaker
Description
Pseudoscalar pole diagrams provide the bulk of the contribution -- as well as a large fraction of the error budget -- of dispersive estimates of the hadronic light-by-light (HLbL) piece of the muon g-2. We report on a calculation of the pion transition form factor $F_{P\rightarrow \gamma\gamma}$ over a range of kinematics, including broad regions which are inaccessible from experimental data, which directly leads to an estimate of the pion pole contribution to the muon g-2. The results are evaluated using physical quark masses and are extrapolated to the continuum using twisted mass ensembles at several lattice spacings. Our result for the g-2 contribution is comparable with previous lattice and data-driven determinations, with combined uncertainties achieving sub-10% precision.
