On calculating disconnected-type hadronic light-by-light scattering diagrams from lattice QCD

Understand

For reliable comparison of the standard model prediction to the muon g-2 with its experimental value, the hadronic light-by-light scattering (HLbL) contribution must be calculated by lattice QCD simulation.

• HLbL contribution has many types of disconnected-type diagrams.
• Here, we start with recalling the point that must be taken care of in every method to calculate them by lattice QCD, and present one concrete method called nonperturbative QED method.