PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Strong interactions and Hadron Physics
Measurement of $e^+e^- \to \pi^+\pi^-\pi^0$ with ISR events at $BABAR$ and calculation of its contribution to the $(g-2)_\mu$
F. Anulli
Full text: pdf
Pre-published on: January 12, 2023
Published on: June 15, 2023
We present an analysis of the process $e^+e^- \to \pi^+\pi^-\pi^0$ performed at BABAR using the initial-state radiation (ISR) technique. The analysis is based on the full BABAR data set of 469 fb$^{-1}$, recorded at and near the $\Upsilon$(4S) resonance. From the fit to the measured $3\pi$ mass spectrum we determine the products
$\Gamma(V\to e^+e^-){\cal{B}}(V\to 3\pi)$, where $V$ is the $\omega(780)$ or the $\phi(1020)$ resonance, and ${\cal{B}}(\rho\to 3\pi)$.
The latter isospin-breaking decay is observed with $6\sigma$ significance. The $e^+e^- \to \pi^+\pi^-\pi^0$ cross section is measured from 0.62 to 3.5 GeV with unprecedented precision. The measured cross section is used to calculate the leading-order hadronic contribution to the muon magnetic anomaly from this exclusive final state with improved accuracy.
We also present preliminary results on a study, performed on the same data set,
of the $K^+K^-\pi^+\pi^-\pi^0$, $K_S K^\pm \pi^\mp\pi^0\pi^0$ and $K_SK^\pm \pi^\mp\pi^+pi^-$ final states produced in $e^+e^-$ collisions via ISR.
DOI: https://doi.org/10.22323/1.414.0786
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.