In hard-wall holographic QCD, the infinite tower of tensor mesons fills most of the missing symmetric longitudinal short-distance constraint and yields a total hadronic light-by-light contribution of about +11 x 10^-11 to the muon g-2, mostly from low energies.
Tarrach, Invariant Amplitudes for Virtual Compton Scattering Off Polarized Nucleons Free from Kinematical Singularities, Zeros and Constraints , Nuovo Cim
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Longitudinal short-distance constraints on hadronic light-by-light scattering and tensor meson contributions to the muon $g-2$
In hard-wall holographic QCD, the infinite tower of tensor mesons fills most of the missing symmetric longitudinal short-distance constraint and yields a total hadronic light-by-light contribution of about +11 x 10^-11 to the muon g-2, mostly from low energies.