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

Preview

Text PhysRevLett.128.172004.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (417kB) | Preview

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.

Interest & Impact

Downloads

59 since deposited on 17 May 2022
31 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item