Status of hadronic light-by-light scattering and the muon $(g-2)$

Abstract

In this talk we review the recent progress on the numerical determination of the Hadronic Light-by-Light contribution to the anomalous magnetic moment of the muon and we discuss the role of experimental data on the accuracy of its determination. Special emphasis on the main contribution, the pseudoscalar piece, is made. Gathering recent progress in the light-by-light scattering contribution we consider $a_μ^{\mathrm{HLBL}} = (12.1\pm3.0)\times10^{-10}$ as a good summary of the state-of-the-art calculations which still claims for a $4σ$ deviation between theory and experiment for the $(g-2)_μ$.

8 pages. Invited talk by P. Masjuan at the 15th International Conference on Flavor Physics and CP Violation held in Prague from the 5th to the 9th of June, 2017. arXiv admin note: substantial text overlap with arXiv:1411.6397