Johan Bijnens
Professor, Deputy Head of Division
Short-distance HLbL contributions to the muon g-2
Author
Summary, in English
The current 3.7σ discrepancy between the Standard Model prediction and the experimental value of the muon anomalous magnetic moment could be a hint for the existence of new physics. The hadronic light-by-light contribution is one of the pieces requiring improved precision on the theory side, and an important step is to derive short-distance constraints for this quantity containing four electromagnetic currents. Here, we derive such short-distance constraints for three large photon loop virtualities and the external fourth photon in the static limit. The static photon is considered as a background field and we construct a systematic operator product expansion in the presence of this field. We show that the massless quark loop, i.e. the leading term, is numerically dominant over non-perturbative contributions up to next-to-next-to leading order, both those suppressed by quark masses and those that are not.
Department/s
- Theoretical Particle Physics - Has been reorganised
Publishing year
2021-07
Language
English
Pages
180-184
Publication/Series
Nuclear and Particle Physics Proceedings
Volume
312-317
Links
Document type
Journal article
Publisher
Elsevier
Topic
- Subatomic Physics
Keywords
- g-2
- Hadronic Light-by-Light
- HLbL
- Muon Anomalous Magnetic Moment
- Non-Perturbative Contributions
- Operator Product Expansion
- Short-Distance Constraints
Status
Published
ISBN/ISSN/Other
- ISSN: 2405-6014