Preprint
Nov 2026
A New Precise Measurement of the $e^+e^-\to\pi^+\pi^-(\gamma)$ Cross Section with the Initial-State Radiation Method at BaBar
We report precise results for the $e^+e^-\to \pi^+\pi^-(\gamma)$ 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-$\Upsilon(4S)$ data, the cross section is derived from th...
J. P. Lees, V. Poireau, V. Tisserand et al.
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