Improved Standard-Model Prediction for π^{0}→e^{+}e^{-}.

Hoferichter, Martin; Hoid, Bai-Long; Kubis, Bastian; Lüdtke, Jan (2022). Improved Standard-Model Prediction for π^{0}→e^{+}e^{-}. Physical review letters, 128(17), p. 172004. American Physical Society 10.1103/PhysRevLett.128.172004

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We present an improved standard-model (SM) prediction for the dilepton decay of the neutral pion. The loop amplitude is determined by the pion transition form factor for π^{0}→γ^{*}γ^{*}, for which we employ a dispersive representation that incorporates both spacelike and timelike data as well as short-distance constraints. The resulting SM branching fraction, Br[π^{0}→e^{+}e^{-}]=6.25(3)×10^{-8}, sharpens constraints on physics beyond the SM, including pseudoscalar and axial-vector mediators.

Item Type:

Journal Article (Review Article)

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

Subjects:

500 Science > 530 Physics

ISSN:

1079-7114

Publisher:

American Physical Society

Language:

English

Submitter:

Pubmed Import

Date Deposited:

17 May 2022 14:30

Last Modified:

05 Dec 2022 16:19

Publisher DOI:

10.1103/PhysRevLett.128.172004

PubMed ID:

35570465

BORIS DOI:

10.48350/170080

URI:

https://boris.unibe.ch/id/eprint/170080

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