Speaker
Description
The anomalous magnetic moment of the muon, $a_\mu = (g - 2)_\mu / 2$, is a
sensitive probe of the Standard Model of particle physics and a possible window
to New Physics.
Presently, the data-driven dispersive predictions for $a_\mu$ significantly
disagree with the experimental world average. These calculations are
based on the optical theorem and make use of the measurements of the hadron production
cross sections in electron-positron annihilation at low energies. In this context, the
process of pion pair production is the dominant channel.
We present precise predictions for the processes
$e^+ e^- \to \pi^+ \pi^-$ and $e^+ e^- \to \pi^+ \pi^- \gamma$, that
have been recently implemented in the Parton Shower event generator
\textsc{BabaYaga} and will be crucial for new measurements and
data re-analysis.
