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

Martin Hoferichter1, Bai-Long Hoid1, Bastian Kubis2

  • 1Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland.

Physical Review Letters
|May 16, 2022
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Summary

We refined the standard model prediction for neutral pion dilepton decay. This improved calculation of the pion transition form factor provides tighter constraints on new physics beyond the standard model.

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Area of Science:

  • Particle Physics
  • Quantum Field Theory

Background:

  • The neutral pion's dilepton decay is a sensitive probe of fundamental physics.
  • Precise theoretical predictions are crucial for interpreting experimental results and searching for new physics.

Purpose of the Study:

  • To provide an improved Standard Model prediction for the neutral pion's dilepton decay.
  • To refine constraints on potential new physics beyond the Standard Model.

Main Methods:

  • Utilizing a dispersive representation for the pion transition form factor (π^{0}→γ^{*}γ^{*}).
  • Incorporating both spacelike and timelike data, alongside short-distance constraints.
  • Calculating the loop amplitude for the dilepton decay.

Main Results:

  • Achieving an improved Standard Model branching fraction prediction for π^{0}→e^{+}e^{-}: Br[π^{0}→e^{+}e^{-}]=6.25(3)×10^{-8}.
  • Demonstrating the sensitivity of this decay to physics beyond the Standard Model.

Conclusions:

  • The refined prediction offers enhanced sensitivity to new physics phenomena.
  • This result helps to constrain models with pseudoscalar and axial-vector mediators.