Short-distance constraints for HLbL in muon g-2
1 Department of Astronomy and Theoretical Physics, Lund University, Box 43, SE221-00 Lund, Sweden
2 Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, Universität Bern, Sidlerstrasse 5, CH–3012 Bern, Switzerland
3 Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
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Published online: 11 January 2022
Model-independent short-distance constraints allow for a reduction of theoretical uncertainties associated to the analytic evaluation of Hadronic Light-by-Light contributions to the 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 the muon g-2 remain. Numerical values for them are also presented.
© The Authors, published by EDP Sciences, 2022
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