#### Alladi Ramakrishnan Hall

#### The hadronic light-by-light scattering contribution to the muon g-2 from holographic QCD

#### Anton Rebhan

##### TU Vienna

*There is a long-standing discrepancy between theoretical and experimental *

results for the anomalous magnetic moment of the muon, at 3 to 4 standard deviations, for which new experimental results from FERMILAB are expected later this year. The theoretical uncertainties of the standard model prediction for the muon g-2 are dominated by hadronic contributions, where the contribution from hadronic light-by-light scattering is particularly

critical. In this talk I present recent results from holographic models of QCD which are able to satisfy theoretical constraints from short-distance limits and the chiral anomaly and at the same time agree well with recent

experimental data on pseudo-scalar and axial vector meson transition form factors. In particular, the much discussed Melnikov-Vainshtein short-distance constraint turns out to be satisfied naturally, yielding a larger contribution from axial vector mesons than inferred from simple phenomenological models but smaller than obtained by ad-hoc modifications designed to incorporate this constraint.

Done