We employ the comparatively minimal extension of hard-wall AdS/QCD due to
Katz and Schwartz which takes into account the U(1)A​ anomaly for computing
hadronic light-by-light scattering contributions of pseudoscalar and axial
vector mesons to the anomalous magnetic moment of the muon aμ​. By
including a gluon condensate as one extra tunable parameter besides those fixed
by fπ​ and the pion, kaon, and rho masses, we obtain remarkably accurate
fits for η and η′ masses and their decay rates to photons, leading to
aμ​ contributions in complete agreement with the Standard Model result by
the Muon g−2 Theory Initiative. Turning to the less well understood axial
vector contributions, we update our previous predictions obtained in
flavor-symmetric hard-wall AdS/QCD models without U(1)A​ breaking.Comment: REVTEX, 13 pages, 4 figures, 4 tables; v2: slight extensions and
updates of numerical results, minor additions, references adde