Breakthrough Tracker record
Hybrid calculation of hadronic vacuum polarization in muon g − 2 to 0.48%
A hybrid lattice-QCD and experimental calculation determined the leading hadronic-vacuum-polarization contribution to 0.48% precision. With other Standard Model terms included, the prediction differs from the final experimental value by only 0.5 standard deviations.
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- Stable ID
muon-g-minus-2-hvp-2026- Revision
muon-g-minus-2-hvp-2026.v1- Field
- Physics · Particle physics and lattice quantum chromodynamics
- Evidence
- Tier 1 · Peer reviewed: Yes
- Record state
- Current · Peer-reviewed publication
- Last checked
AI role
No AI assistance was disclosed in the paper or linked reporting.
Record details
- Problem or result
- The discrepancy between measured and predicted values of the muon's anomalous magnetic moment
- Authors
- A. Boccaletti, Sz. Borsanyi, A. Cotellucci, M. Davier, Z. Fodor and collaborators
- Institutions
- University of Wuppertal, Forschungszentrum Jülich, Université Paris-Saclay/CNRS, Aix-Marseille University/CNRS and partners
- Result date
- April 22, 2026
Why it matters
The calculation strongly weakens the former interpretation of muon g − 2 as evidence for undiscovered particles.
Limits
It does not remove every theory-level disagreement: tensions remain among some electron–positron datasets and between certain dispersive and lattice determinations. The careful conclusion is that the former anomaly is largely reconciled under the updated lattice-led prediction.
Sources
- Primary: Hybrid theory calculation in Nature
- Independent: Muon g − 2 experimental measurement in Physical Review Letters
- Independent: Forschungszentrum Jülich technical context
Correction and revision history
- Initial entry; the 2026 theory result materially changed the interpretation of the June 2025 experimental precision update.
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