Measurement of e+e− → π+π−π0 at BABAR and calculation of (g−2)
| Autor: | Vasseur, Georges |
|---|---|
| Přispěvatelé: | Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay |
| Rok vydání: | 2023 |
| Předmět: |
electron
Nuclear and High Energy Physics muon magnetic moment BABAR cross section measured GeV Hadronic cross section pi mass spectrum Muon anomalous magnetic moment higher-order 0 [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] pi+ pi branching ratio radiation initial-state interaction initial state cross section hadronic |
| Zdroj: | Nucl.Part.Phys.Proc. 25th International Conference in Quantum Chromodynamics 25th International Conference in Quantum Chromodynamics, Jul 2022, Montpellier, France. pp.119-124, ⟨10.1016/j.nuclphysbps.2023.01.024⟩ |
| ISSN: | 2405-6014 |
| DOI: | 10.1016/j.nuclphysbps.2023.01.024 |
| Popis: | International audience; We present a study of the process e+e−→π+π−π0 at BABAR using the initial-state radiation technique. The analysis is based on the full BABAR data set, 469fb−1, recorded at and near the ϒ(4S) resonance. From the fit to the measured three pion mass spectrum we determine the products Γ(V→e+e−)B (V→π+π−π0) for the ω and ϕ resonances, and the branching ratio B (ρ→π+π−π0). The latter isospin-breaking decay is observed with 6σ significance. The e+e−→π+π−π0 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. |
| Databáze: | OpenAIRE |
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