Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Measurement of $e^+e^- \to \pi^+\pi^-\pi^0$ with ISR events at $BABAR$ and calculation of its contribution to the $(g-2)_\mu$

Jul 8, 2022, 9:15 AM
15m
Room 1 (Europa Auditorium)

Room 1 (Europa Auditorium)

Parallel Talk Strong interactions and Hadron Physics Strong interactions and Hadron Physics

Speaker

Fabio Anulli (Istituto Nazionale di Fisica Nucleare)

Description

We present a study of the process $e^+e^- \to \pi^+\pi^-\pi^0$ at $BABAR$ using the initial-state radiation technique. The analysis is based on the full $BABAR$ data set, 469 fb$^{-1}$, recorded at and near the $\Upsilon(4{\mathrm{S}})$ resonance. From the fit to the measured $3\pi$ mass spectrum we determine the products $\Gamma(V\to e^+e^-){\cal{B}}(V\to 3\pi)$ for the omega and phi resonances, 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 GeV to 3.5 GeV. 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.

In-person participation Yes

Primary author

Fabio Anulli (Istituto Nazionale di Fisica Nucleare)

Presentation materials