Studies of e+e- Collisions with a Hard Initial-State Photon at BaBar

Abstract

We present preliminary BaBar measurements of hadronic cross sections in $e^+e^-$ annihilation using the radiative return technique. The cross sections for $e^+e^- \to p\bar{p} $, $ 3(\pi^+\pi^-)$, $ 2(\pi^+\pi^-)2\pi^0$, and $ K^+K^-2(\pi^+\pi^-)$ are measured. Measurements of the proton form factor and of the ratio $G_E/G_M$ are also shown.