Holographic QCD and the muon anomalous magnetic moment
Abstract
We review the recent progress made in using holographic QCD to study hadronic contributions to the anomalous magnetic moment of the muon, in particular the hadronic lightbylight scattering contribution, where the shortdistance constraints associated with the axial anomaly are notoriously difficult to satisfy in hadronic models. This requires the summation of an infinite tower of axial vector mesons, which is naturally present in holographic QCD models, and indeed takes care of the longitudinal shortdistance constraint due to Melnikov and Vainshtein. Numerically the results of simple hardwall holographic QCD models point to larger contributions from axial vector mesons than assumed previously, while the predicted contributions from pseudoGoldstone bosons agree nicely with datadriven approaches.
 Publication:

European Physical Journal C
 Pub Date:
 November 2021
 DOI:
 10.1140/epjc/s10052021097808
 arXiv:
 arXiv:2110.07458
 Bibcode:
 2021EPJC...81.1008L
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 Review article for Eur.Phys.J.C., topical selection "New Frontiers in Holographic Duality", 18 pages, 11 figures, 4 tables (v2: references updated, typo in table 2 corrected)