Heidelberg 2015 – scientific programme

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SYDM: Symposium Dipole Moments - A Tool to Search for New Physics

SYDM 3: Session 3

SYDM 3.4: Talk

Tuesday, March 24, 2015, 17:45–18:00, P/H1

Towards a data-driven estimate of the pseudoscalar-pole contribution to hadronic light-by-light scattering in the muon g−2 — •Andreas Nyffeler — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Deutschland

The evaluation of the numerically dominant pseudoscalar-pole contribution to hadronic light-by-light scattering in the muon g−2 involves the pseudoscalar-photon transition form factor F_Pγ^*γ^*(Q₁², Q₂²) with P = π⁰, η, η^′ and, in general, two off-shell photons with spacelike momenta Q_i². We determine which regions of photon momenta give the main contribution in the corresponding 3-dimensional integral representation for hadronic light-by-light scattering. Furthermore, we discuss how the precision of future measurements of the doubly off-shell form factor, or its determination via a dispersion relation, impacts the precision of a data-driven estimate of this contribution to hadronic light-by-light scattering.