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Short-distance HLbL contributions to the muon g-2

Bijnens, Johan LU orcid ; Hermansson-Truedsson, Nils LU orcid ; Laub, Laetitia and Rodríguez-Sánchez, Antonio LU (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
; ; and
organization
publishing date
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
2024-04-13 20:23:47
@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}},
}