Improved Standard-Model prediction for $\pi^0\to e^+e^-$
High Energy Physics - Phenomenology
2022-05-02 v2 High Energy Physics - Experiment
High Energy Physics - Lattice
Nuclear Theory
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 , for which we employ a dispersive representation that incorporates both space-like and time-like data as well as short-distance constraints. The resulting SM branching fraction, , sharpens constraints on physics beyond the SM, including pseudoscalar and axial-vector mediators.
Cite
@article{arxiv.2105.04563,
title = {Improved Standard-Model prediction for $\pi^0\to e^+e^-$},
author = {Martin Hoferichter and Bai-Long Hoid and Bastian Kubis and Jan Lüdtke},
journal= {arXiv preprint arXiv:2105.04563},
year = {2022}
}
Comments
9 pages, 3 figures; journal version