One of the main contributions to theoretical uncertainties in muon g-2 comes from Hadronic Light-by-Light.
In order to achieve a significant reduction of them in the data-driven approach we need a better understanding of the different contributions from intermediate and high-energy regions.
In this talk I focus on the contributions associated to large loop momenta. It is shown how a precise Operator Product Expansion can be applied in this regime.
The massless quark loop is shown to give the leading order. Both gluonic corrections and power corrections are assessed. They are found to be numerically small.
The gluonic correction is found to be negative and the leading power correction is observed to scale as the pseudoscalar mass squared. The associated muon g-2 contributions are also displayed.
Antonio Rodriguez (Paris): HLbL contribution to muon g-2 at short distances
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