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

TL;DR

This paper reports BaBar's preliminary measurements of various hadronic cross sections in electron-positron collisions using the radiative return method, providing insights into proton form factors and particle ratios.

Contribution

It introduces the use of the radiative return technique at BaBar to measure multiple hadronic cross sections and form factors in $e^+e^-$ annihilation.

Findings

Measured cross sections for multiple hadronic final states.

Determined proton form factor and $G_E/G_M$ ratio.

Provided new data for understanding hadronic interactions.

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.