Nils Hermansson-Truedsson
Affiliated
Short-distance HLbL contributions to the muon anomalous magnetic moment beyond perturbation theory
Author
Summary, in English
The hadronic light-by-light contribution to the muon anomalous magnetic moment depends on an integration over three off-shell momenta squared (Qi2) of the correlator of four electromagnetic currents and the fourth leg at zero momentum. We derive the short-distance expansion of this correlator in the limit where all three Qi2 are large and in the Euclidean domain in QCD. This is done via a systematic operator product expansion (OPE) in a background field which we construct. The leading order term in the expansion is the massless quark loop. We also compute the non-perturbative part of the next-to-leading contribution, which is suppressed by quark masses, and the chiral limit part of the next-to-next-to leading contributions to the OPE. We build a renormalisation program for the OPE. The numerical role of the higher-order contributions is estimated and found to be small.
Department/s
- Theoretical Particle Physics - Has been reorganised
Publishing year
2020
Language
English
Publication/Series
Journal of High Energy Physics
Volume
2020
Issue
10
Document type
Journal article
Publisher
Springer
Topic
- Subatomic Physics
Keywords
- Nonperturbative Effects
- Perturbative QCD
- Precision QED
Status
Published
ISBN/ISSN/Other
- ISSN: 1029-8479