Short-distance HLbL contributions to the muon g-2

Johan Bijnens, Nils Hermansson-Truedsson, Laetitia Laub, Antonio Rodríguez-Sánchez

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)180-184
Number of pages5
JournalNuclear and Particle Physics Proceedings
Publication statusPublished - 2021 Jul

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • g-2
  • Hadronic Light-by-Light
  • HLbL
  • Muon Anomalous Magnetic Moment
  • Non-Perturbative Contributions
  • Operator Product Expansion
  • Short-Distance Constraints


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