Hadronic light-by-light contribution to the muon g-2 from holographic QCD with solved U(1)A problem

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 a mu. By including a gluon condensate as one extra tunable parameter besides those fixed by f pi and the pion, kaon, and rho masses, we obtain remarkably accurate fits for eta and eta 0 masses and their decay rates to photons, leading to a mu 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.