B. D. A. J. Lankford

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...