ICHEP 2022

Measurement of e+e−→π+π−π0 with ISR events at BABAR and calculation of its contribution to the (g−2)μ

8 Jul 2022, 09:15

15m

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 $\mathrm{{\rm Y}}(4\mathrm{S})$ resonance. From the fit to the measured $3\pi$ mass spectrum we determine the products $\mathrm{\Gamma }(V\to e^{+}{e}^{-})\mathcal{B}(V\to 3\pi )$ for the omega and phi resonances, and $\mathcal{B}(\rho \to 3\pi )$. 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.

Presentation materials

Anulli-ICHEP-2022.pdf