Improved Standard-Model Prediction for π0→e+e-

Autor(en): Martin Hoferichter, Bai-Long Hoid, Bastian Kubis, Jan Lüdtke
Abstrakt: 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(en): Teilchenphysik
Externe Organisation(en): Universität Bern, Rheinische Friedrich-Wilhelms-Universität Bonn
Journal: Physical Review Letters
Band: 128
Anzahl der Seiten: 7
ISSN: 0031-9007
DOI: https://doi.org/10.1103/PhysRevLett.128.172004
Publikationsdatum: 04-2022
Peer-reviewed: Ja
ÖFOS 2012: 103034 Teilchenphysik
Schlagwörter
ASJC Scopus Sachgebiete: Physics and Astronomy(all)
Link zum Portal: https://ucris.univie.ac.at/portal/de/publications/improved-standardmodel-prediction-for-0ee(6fc61aab-9c7a-4339-9070-bd73f0a57bf1).html

Improved Standard-Model Prediction for π<sup>0</sup>→e<sup>+</sup>e<sup>-</sup>