Short-distance constraints on hadronic light-by-light scattering in the anomalous magnetic moment of the muon
Short-distance constraints on hadronic light-by-light scattering in the anomalous magnetic moment of the muon
A key ingredient in the evaluation of hadronic light-by-light (HLbL) scattering in the anomalous magnetic moment of the muon $(g-2)_\mu$ concerns short-distance constraints (SDCs) that follow from QCD by means of the operator product expansion. Here we concentrate on the most important such constraint, in the longitudinal amplitudes, and show …