The hadronic light-by-light contribution to the muon's anomalous magnetic moment
In view of the current 3 - 4 $σ$ deviation between theoretical and experimental values for the muon's anomalous magnetic moment, we review the ongoing efforts in constraining the hadronic light-by-light contribution to $a_μ$ by using dispersive techniques combined with a dedicated experimental program to obtain the required hadronic input.
hep-ph↗