Hoferichter, Martin; Colangelo, Gilberto; Hoid, Bai-Long; Kubis, Bastian; Ruiz de Elvira, Jacobo; Schuh, Dominic; Stamen, Dominik; Stoffer, Peter (2023). Phenomenological Estimate of Isospin Breaking in Hadronic Vacuum Polarization. Physical review letters, 131(16), p. 161905. American Physical Society 10.1103/PhysRevLett.131.161905
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Puzzles in the determination of the hadronic-vacuum-polarization contribution currently impede a conclusive interpretation of the precision measurement of the anomalous magnetic moment of the muon at the Fermilab experiment. One such puzzle concerns tensions between evaluations in lattice QCD and using e^{+}e^{-}→hadrons cross-section data. In lattice QCD, the dominant isospin-symmetric part and isospin-breaking (IB) corrections are calculated separately, with very different systematic effects. Identifying these two pieces in a data-driven approach provides an opportunity to compare them individually and trace back the source of the discrepancy. Here, we estimate the IB component of the lattice-QCD calculations from phenomenology, based on a comprehensive study of exclusive contributions that can be enhanced via infrared singularities, threshold effects, or hadronic resonances, including, for the first time, in the e^{+}e^{-}→3π channel. We observe sizable cancellations among different channels, with a sum that even suggests a slightly larger result for the QED correction than obtained in lattice QCD. We conclude that the tensions between lattice QCD and e^{+}e^{-} data therefore cannot be explained by the IB contributions in the lattice-QCD calculations.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) 08 Faculty of Science > Institute of Theoretical Physics |
UniBE Contributor: |
Hoferichter, Martin, Colangelo, Gilberto |
Subjects: |
500 Science > 530 Physics |
ISSN: |
0031-9007 |
Publisher: |
American Physical Society |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
06 Nov 2023 14:53 |
Last Modified: |
12 Nov 2023 02:34 |
Publisher DOI: |
10.1103/PhysRevLett.131.161905 |
PubMed ID: |
37925732 |
BORIS DOI: |
10.48350/188588 |
URI: |
https://boris.unibe.ch/id/eprint/188588 |
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