Measurement of e+e− → π+π−π0 at BABAR and calculation of (g−2)μ - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Measurement of e+e− → π+π−π0 at BABAR and calculation of (g−2)μ

Résumé

We present a study of the process e+eπ+ππ0 at BABAR using the initial-state radiation technique. The analysis is based on the full BABAR data set, 469fb1, recorded at and near the ϒ(4S) resonance. From the fit to the measured three pion mass spectrum we determine the products Γ(Ve+e)B (Vπ+ππ0) for the ω and ϕ resonances, and the branching ratio B (ρπ+ππ0). The latter isospin-breaking decay is observed with 6σ significance. The e+eπ+ππ0 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 anomalous magnetic moment from this exclusive final state with improved accuracy. A short status is given on the current discrepancy between the predicted value and the measured value of the muon anomalous magnetic moment.
Fichier non déposé

Dates et versions

hal-03990581 , version 1 (15-02-2023)

Identifiants

Citer

Georges Vasseur. Measurement of e+e− → π+π−π0 at BABAR and calculation of (g−2)μ. 25th International Conference in Quantum Chromodynamics, Jul 2022, Montpellier, France. pp.119-124, ⟨10.1016/j.nuclphysbps.2023.01.024⟩. ⟨hal-03990581⟩
4 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More