Short-distance HLbL contributions to the muon g-2
(2021) In Nuclear and Particle Physics Proceedings 312-317. p.180-184- Abstract
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... (More)
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.
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- author
- Bijnens, Johan LU ; Hermansson-Truedsson, Nils LU ; Laub, Laetitia and Rodríguez-Sánchez, Antonio LU
- organization
- publishing date
- 2021-07
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- g-2, Hadronic Light-by-Light, HLbL, Muon Anomalous Magnetic Moment, Non-Perturbative Contributions, Operator Product Expansion, Short-Distance Constraints
- in
- Nuclear and Particle Physics Proceedings
- volume
- 312-317
- pages
- 5 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:85122808390
- ISSN
- 2405-6014
- DOI
- 10.1016/j.nuclphysbps.2021.05.048
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2021 Elsevier B.V.
- id
- 7e5ee5b4-680e-4ba2-a9a3-73e4fb7addfb
- date added to LUP
- 2022-02-06 13:07:28
- date last changed
- 2023-01-01 20:00:40
@article{7e5ee5b4-680e-4ba2-a9a3-73e4fb7addfb, abstract = {{<p>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.</p>}}, author = {{Bijnens, Johan and Hermansson-Truedsson, Nils and Laub, Laetitia and Rodríguez-Sánchez, Antonio}}, issn = {{2405-6014}}, keywords = {{g-2; Hadronic Light-by-Light; HLbL; Muon Anomalous Magnetic Moment; Non-Perturbative Contributions; Operator Product Expansion; Short-Distance Constraints}}, language = {{eng}}, pages = {{180--184}}, publisher = {{Elsevier}}, series = {{Nuclear and Particle Physics Proceedings}}, title = {{Short-distance HLbL contributions to the muon g-2}}, url = {{http://dx.doi.org/10.1016/j.nuclphysbps.2021.05.048}}, doi = {{10.1016/j.nuclphysbps.2021.05.048}}, volume = {{312-317}}, year = {{2021}}, }