Results from Electron-Positron Collisions at BESIII

TL;DR

This paper reviews diverse physics results from electron-positron collisions at BESIII, including measurements relevant to muon g-2, proton structure, charmonium decays, and exotic states, demonstrating the collider's broad research scope.

Contribution

It provides a comprehensive overview of recent experimental findings across multiple physics topics using BESIII data, highlighting new decay modes and measurements.

Findings

Precise cross section measurements for $e^+e^- o \pi^+\pi^-$ and $e^+e^- o par{p}$.

Observation of new decay modes of charmonium states.

Insights into the nature of the $XYZ$ exotic states.

Abstract

A selection of results from electron-positron collisions at BESIII are reviewed. The results presented here illustrate the wide range of physics topics that can be studied using the Beijing Electron Positron Collider~(BEPC). At low collision energies, the cross section for $e^+e^-\to \pi^+\pi^-$ provides much-needed input into theoretical calculations of the anomalous magnetic moment of the muon, and the reaction $e^+e^-\to p\bar{p}$ provides access to the electromagnetic form factors of the proton. In the charmonium region, a large sample of $\psi^\prime$ decays can be used to measure new decay modes of charmonium states. And at higher energies, BESIII is uniquely situated to explore questions concerning the still-unexplained $XYZ$ states.