Aug 2 – 6, 2021
Europe/Brussels timezone

Short-distance constraints for HLbL in muon g-2

Aug 5, 2021, 10:35 AM


Parallel contribution E: QCD and New Physics Parallels Track E


Antonio Rodriguez-Sanchez (IJCLab)


Model-independent short-distance constraints allow for a reduction of theoretical uncertainties associated to the analytic evaluation of Hadronic Light by Light contributions to muon g-2. In this talk we focus on the region where the three loop virtualities are large. Even when the fourth photon leg is soft, we show how a precise Operator Product Expansion can be applied in that region. The leading contribution is found to be given by the quark loop, while the evaluation of both gluonic and power corrections show how the expansion is well behaved at relatively low energies, where significant contributions to muon g-2 remain. Numerical values for them are also presented.

Primary authors

Antonio Rodriguez-Sanchez (IJCLab) Johan Bijnens (Lund University) Nils Hermansson-Truedsson (Universität Bern) Laetitia Laub (Universität Bern)

Presentation materials