Pion-Pole Contribution to Hadronic Light-By-Light Scattering in the Anomalous Magnetic Moment of the Muon
Abstract
Here, the π0 pole constitutes the lowest-lying singularity of the hadronic light-by-light (HLBL) tensor, and thus, it provides the leading contribution in a dispersive approach to HLBL scattering in the anomalous magnetic moment of the muon (g–2)μ. It is unambiguously defined in terms of the doubly virtual pion transition form factor, which in principle, can be accessed in its entirety by experiment. We demonstrate that, in the absence of a direct measurement, the full spacelike doubly virtual form factor can be reconstructed very accurately based on existing data for e+e– → 3π, e+e– → e+e–π0, and the π0 → γγ decay width. We derive a representation that incorporates all the low-lying singularities of the form factor, matches correctly onto the asymptotic behavior expected from perturbative QCD, and is suitable for the evaluation of the (g–2)μ loop integral. The resulting value, aπ0-poleμ = 62.6+3.0–2.5 × 10–11, for the first time, represents a complete data-driven determination of the pion-pole contribution with fully controlled uncertainty estimates. In particular, we show that already improved singly virtual measurements alone would allow one to further reduce the uncertainty in aπ0-poleμ.
- Authors:
- Publication Date:
- Research Org.:
- Univ. of Washington, Seattle, WA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1469750
- Alternate Identifier(s):
- OSTI ID: 1502087
- Grant/Contract Number:
- FG02-00ER41132
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Name: Physical Review Letters Journal Volume: 121 Journal Issue: 11; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Hoferichter, Martin, Hoid, Bai-Long, Kubis, Bastian, Leupold, Stefan, and Schneider, Sebastian P. Pion-Pole Contribution to Hadronic Light-By-Light Scattering in the Anomalous Magnetic Moment of the Muon. United States: N. p., 2018.
Web. doi:10.1103/PhysRevLett.121.112002.
Hoferichter, Martin, Hoid, Bai-Long, Kubis, Bastian, Leupold, Stefan, & Schneider, Sebastian P. Pion-Pole Contribution to Hadronic Light-By-Light Scattering in the Anomalous Magnetic Moment of the Muon. United States. https://doi.org/10.1103/PhysRevLett.121.112002
Hoferichter, Martin, Hoid, Bai-Long, Kubis, Bastian, Leupold, Stefan, and Schneider, Sebastian P. Wed .
"Pion-Pole Contribution to Hadronic Light-By-Light Scattering in the Anomalous Magnetic Moment of the Muon". United States. https://doi.org/10.1103/PhysRevLett.121.112002.
@article{osti_1469750,
title = {Pion-Pole Contribution to Hadronic Light-By-Light Scattering in the Anomalous Magnetic Moment of the Muon},
author = {Hoferichter, Martin and Hoid, Bai-Long and Kubis, Bastian and Leupold, Stefan and Schneider, Sebastian P.},
abstractNote = {Here, the π0 pole constitutes the lowest-lying singularity of the hadronic light-by-light (HLBL) tensor, and thus, it provides the leading contribution in a dispersive approach to HLBL scattering in the anomalous magnetic moment of the muon (g–2)μ. It is unambiguously defined in terms of the doubly virtual pion transition form factor, which in principle, can be accessed in its entirety by experiment. We demonstrate that, in the absence of a direct measurement, the full spacelike doubly virtual form factor can be reconstructed very accurately based on existing data for e+e– → 3π, e+e– → e+e–π0, and the π0 → γγ decay width. We derive a representation that incorporates all the low-lying singularities of the form factor, matches correctly onto the asymptotic behavior expected from perturbative QCD, and is suitable for the evaluation of the (g–2)μ loop integral. The resulting value, aπ0-poleμ = 62.6+3.0–2.5 × 10–11, for the first time, represents a complete data-driven determination of the pion-pole contribution with fully controlled uncertainty estimates. In particular, we show that already improved singly virtual measurements alone would allow one to further reduce the uncertainty in aπ0-poleμ.},
doi = {10.1103/PhysRevLett.121.112002},
journal = {Physical Review Letters},
number = 11,
volume = 121,
place = {United States},
year = {Wed Sep 12 00:00:00 EDT 2018},
month = {Wed Sep 12 00:00:00 EDT 2018}
}
https://doi.org/10.1103/PhysRevLett.121.112002
Web of Science
Figures / Tables:
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Lattice calculation of the pion transition form factor with Wilson quarks
journal, August 2019
- Gérardin, Antoine; Meyer, Harvey B.; Nyffeler, Andreas
- Physical Review D, Vol. 100, Issue 3
of charged leptons, , and the hyperfine splitting of muonium
journal, January 2020
- Keshavarzi, Alexander; Nomura, Daisuke; Teubner, Thomas
- Physical Review D, Vol. 101, Issue 1
Precise Determination of the Branching Ratio of the Neutral-Pion Dalitz Decay
journal, January 2019
- Husek, Tomáš; Goudzovski, Evgueni; Kampf, Karol
- Physical Review Letters, Vol. 122, Issue 2
Opportunities for Lattice QCD in quark and lepton flavor physics
journal, November 2019
- Lehner, Christoph; Meinel, Stefan; Blum, Tom
- The European Physical Journal A, Vol. 55, Issue 11
Hadronic light-by-light scattering in the anomalous magnetic moment of the muon
text, January 2019
- Asmussen, Nils; Gerardin, Antoine; Nyffeler, Andreas
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
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