Improved Standard-Model Prediction for π<sup>0</sup>→e<sup>+</sup>e<sup>-</sup>
- Author(s)
- Martin Hoferichter, Bai-Long Hoid, Bastian Kubis, Jan Lüdtke
- Abstract
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 p0**, 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[p0?e+e-]=6.25(3)×10-8, sharpens constraints on physics beyond the SM, including pseudoscalar and axial-vector mediators.
- Organisation(s)
- Particle Physics
- External organisation(s)
- Universität Bern, Rheinische Friedrich-Wilhelms-Universität Bonn
- Journal
- Physical Review Letters
- Volume
- 128
- No. of pages
- 7
- ISSN
- 0031-9007
- DOI
- https://doi.org/10.1103/PhysRevLett.128.172004
- Publication date
- 04-2022
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103034 Particle physics
- Keywords
- ASJC Scopus subject areas
- Physics and Astronomy(all)
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/improved-standardmodel-prediction-for-0ee(6fc61aab-9c7a-4339-9070-bd73f0a57bf1).html