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PreprintCC BY 4.0arXiv

A New Precise Measurement of the e+e-→π+π-(γ) Cross Section with the Initial-State Radiation Method at BaBar

  • BaBar Collaboration
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Abstract

We report precise results for the e+e-→ π+π-(γ) cross section in the energy range between threshold and 1.4 GeV, relevant for the hadronic vacuum polarization contribution to the muon g−2 prediction. Using the full 460 fb−1 of on- and off-Υ(4S) data, the cross section is derived from the ratio of π+π- to μ+μ- initial-state radiation (ISR) events, in which many systematic uncertainties cancel. The pion/muon separation does not rely on particle identification as in the 2009 BaBar analysis, but rather makes use of the well-known, different angular distributions in the two-particle center-of-mass system. The compatibility and correlation between the 2026 and 2009 measurements are discussed. The new measurement is also compared with other two-pion results. The leading-order hadronic contribution to the muon magnetic anomaly calculated using the new 2026 and combined 2009 and 2026 BaBar measurements in the energy range of 0.3−1.4 GeV are 525.9± 3.5stat±3.8syst and 517.8± 2.4stat±3.3syst in units of 10−10, respectively.

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Cite

BibTeXRIS
BibTeX
@misc{collaboration2026precise,
  title = {{A New Precise Measurement of the $e^+e^-\toπ^+π^-(γ)$ Cross Section with the Initial-State Radiation Method at BaBar}},
  author = {BaBar Collaboration},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.04621},
  eprint = {2611.04621},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.04621},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - A New Precise Measurement of the e^+e^-→π^+π^-(γ) Cross Section with the Initial-State Radiation Method at BaBar
AU  - BaBar Collaboration
PY  - 2026
DA  - 2026/11/03
PB  - arXiv
DO  - 10.48550/arxiv.2611.04621
UR  - https://arxiv.org/abs/2611.04621
AB  - We report precise results for the e^+e^-→ π^+π^-(γ) cross section in the energy range between threshold and 1.4 GeV, relevant for the hadronic vacuum polarization contribution to the muon g−2 prediction. Using the full 460 fb^−1 of on- and off-Υ(4S) data, the cross section is derived from the ratio of π^+π^- to μ^+μ^- initial-state radiation (ISR) events, in which many systematic uncertainties cancel. The pion/muon separation does not rely on particle identification as in the 2009 BaBar analysis, but rather makes use of the well-known, different angular distributions in the two-particle center-of-mass system. The compatibility and correlation between the 2026 and 2009 measurements are discussed. The new measurement is also compared with other two-pion results. The leading-order hadronic contribution to the muon magnetic anomaly calculated using the new 2026 and combined 2009 and 2026 BaBar measurements in the energy range of 0.3−1.4 GeV are 525.9± 3.5_stat±3.8_syst and 517.8± 2.4_stat±3.3_syst in units of 10^−10, respectively.
ER  -