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On the charm contribution to the muon g - 2 light-by-light

Bijnens, Johan LU orcid ; Hermansson-Truedsson, Nils LU orcid and Rodríguez-Sánchez, Antonio LU (2026) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 873.
Abstract

We combine existing perturbative results to show that a precise analytic determination of the charm-quark contribution to the hadronic light-by-light (HLbL) part of the muon anomalous magnetic moment is possible. Working in the MS‾ scheme, we include the NLO O(αs) correction, which significantly reduces the residual renormalization-scale dependence and the perturbative uncertainty. Our final result is aμHLbLc=3.65(25)×10−11, in good agreement with recent lattice determinations.

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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Charm quark, Hadronic light-by-light scattering, Muon anomalous magnetic moment, Perturbative QCD
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
873
article number
140178
publisher
Elsevier
external identifiers
  • scopus:105027744865
ISSN
0370-2693
DOI
10.1016/j.physletb.2026.140178
language
English
LU publication?
yes
id
9b5312fd-f451-4a66-ab2a-a4ff62b1310a
date added to LUP
2026-02-19 12:53:47
date last changed
2026-02-19 12:54:23
@article{9b5312fd-f451-4a66-ab2a-a4ff62b1310a,
  abstract     = {{<p>We combine existing perturbative results to show that a precise analytic determination of the charm-quark contribution to the hadronic light-by-light (HLbL) part of the muon anomalous magnetic moment is possible. Working in the MS‾ scheme, we include the NLO O(α<sub>s</sub>) correction, which significantly reduces the residual renormalization-scale dependence and the perturbative uncertainty. Our final result is a<sub>μ</sub><sup>HLbLc</sup>=3.65(25)×10<sup>−11</sup>, in good agreement with recent lattice determinations.</p>}},
  author       = {{Bijnens, Johan and Hermansson-Truedsson, Nils and Rodríguez-Sánchez, Antonio}},
  issn         = {{0370-2693}},
  keywords     = {{Charm quark; Hadronic light-by-light scattering; Muon anomalous magnetic moment; Perturbative QCD}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{On the charm contribution to the muon g - 2 light-by-light}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2026.140178}},
  doi          = {{10.1016/j.physletb.2026.140178}},
  volume       = {{873}},
  year         = {{2026}},
}