Speaker
Dr
Antoine Gerardin
(Institute for Nuclear Physics, University of Mainz)
Description
We report on the lattice QCD calculation of the π0→γ∗γ∗ form factor with photon virtualities in the range Q2∈[0−1.5]~GeV2. Different lattice spacings and pion masses are used to extrapolate our result to the physical point. First, we check that our results, once extrapolated to the chiral and continuum limit, are compatible with the chiral anomaly. Then, the shape of the form factor is compared to different phenomenological models proposed in the literature and to experimental data in the single-virtual case when one photon is on-shell. From a phenomenological point of view, this form factor determines the π0 pole contribution to hadronic light-by-light (HLbL) scattering in the muon g−2,thought to be dominant.
Primary author
Dr
Antoine Gerardin
(Institute for Nuclear Physics, University of Mainz)
Co-authors
Dr
Andreas Nyffeler
(Institute for Nuclear Physics, JGU Mainz)
Prof.
Harvey Meyer
(Joh. Gutenberg University Mainz)
