Hadronic Vacuum Polarization: (g − 2) μ versus Global Electroweak Fits

Crivellin, Andreas; Hoferichter, Martin; Manzari, Claudio Andrea; Montull, Marc (2020). Hadronic Vacuum Polarization: (g − 2) μ versus Global Electroweak Fits. Physical review letters, 125(9), 091801. American Physical Society 10.1103/PhysRevLett.125.091801

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Hadronic vacuum polarization (HVP) is not only a critical part of the standard model (SM) prediction for the anomalous magnetic moment of the muon
(g−2)μ, but also a crucial ingredient for global fits to electroweak (EW) precision observables due to its contribution to the running of the fine-structure constant encoded in Δα(5)had. We find that with modern EW precision data, including the measurement of the Higgs mass, the global fit alone provides a competitive, independent determination of Δα(5)had|EW=270.2(3.0)×10−4. This value actually lies below the range derived from e+e−→hadrons cross section data, and thus goes into the opposite direction as would be required if a change in HVP were to bring the SM prediction for (g−2)μ into agreement with the Brookhaven measurement. Depending on the energy where the bulk of the changes in the cross section occurs, reconciling experiment and SM predictions for (g−2)μ by adjusting HVP would thus not necessarily weaken the case for physics beyond the SM (BSM), but to some extent shift it from (g−2)μ to the EW fit. We briefly explore some options of BSM scenarios that could conceivably explain the ensuing tension.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Crivellin, Andreas and Hoferichter, Martin

Subjects:

500 Science > 530 Physics

ISSN:

0031-9007

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

19 Nov 2020 17:39

Last Modified:

19 Nov 2020 17:39

Publisher DOI:

10.1103/PhysRevLett.125.091801

ArXiv ID:

2003.04886

BORIS DOI:

10.7892/boris.148255

URI:

https://boris.unibe.ch/id/eprint/148255

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