Speaker
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 |
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