Short-distance constraints for the longitudinal component of the hadronic light-by-light amplitude: an update
Short-distance constraints for the longitudinal component of the hadronic light-by-light amplitude: an update
We reassess the impact of short-distance constraints for the longitudinal component of the hadronic light-by-light amplitude on the anomalous magnetic moment of the muon, $a_\mu=(g-2)_\mu/2$, by comparing different solutions that have recently appeared in the literature. In particular, we analyze the relevance of the exact axial anomaly and its impact …