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Puzzles in the hadronic contributions to the muon anomalous magnetic moment


Colangelo, Gilberto; Hoferichter, Martin; Stoffer, Peter (2023). Puzzles in the hadronic contributions to the muon anomalous magnetic moment. In: 21st Conference on Flavor Physics and CP Violation, Lyon, France, 29 May 2023 - 2 June 2023, SISSA.

Abstract

We summarize recent developments in the Standard-Model evaluation of the anomalous magnetic moment of the muon $a_μ$, both in the hadronic-light-by-light and hadronic-vacuum-polarization contributions. The current situation for the latter is puzzling as we are confronted with multiple discrepancies that are not yet understood. We present updated fits of a dispersive representation of the pion vector form factor to the new CMD-3 data set and quantify the tensions with the other high-statistics $e^+e^−→π^+π^−$ experiments in the contribution to $a_μ$ in the energy range up to 1 GeV, as well as in the corresponding contribution to the intermediate Euclidean window.

Abstract

We summarize recent developments in the Standard-Model evaluation of the anomalous magnetic moment of the muon $a_μ$, both in the hadronic-light-by-light and hadronic-vacuum-polarization contributions. The current situation for the latter is puzzling as we are confronted with multiple discrepancies that are not yet understood. We present updated fits of a dispersive representation of the pion vector form factor to the new CMD-3 data set and quantify the tensions with the other high-statistics $e^+e^−→π^+π^−$ experiments in the contribution to $a_μ$ in the energy range up to 1 GeV, as well as in the corresponding contribution to the intermediate Euclidean window.

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Item Type:Conference or Workshop Item (Paper), not_refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Health Sciences > Multidisciplinary
Language:English
Event End Date:2 June 2023
Deposited On:05 Jan 2024 12:44
Last Modified:28 Jun 2024 03:31
Publisher:SISSA
Series Name:Proceedings of science
ISSN:1824-8039
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.22323/1.445.0042
Official URL:https://pos.sissa.it/445/042
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)