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.