Bepcii and Besiii

TL;DR

The paper discusses the upgrade of the Beijing Electron Collider to BEPCII and the BESIII detector, enabling high-luminosity data collection for particle physics research at energies between 2 and 4.6 GeV.

Contribution

It introduces the upgraded collider and detector, highlighting their capabilities and the potential for significant physics discoveries.

Findings

First events obtained during commissioning

Expected to collect 10 billion J/ψ events annually

Operational readiness for physics data taking in fall 2008

Abstract

The Beijing Electron Collider has been upgraded (BEPCII) to a two-ring collider with a design luminosity of $1 \times 10^{33}$cm$^{-2}$ s$^{-1}$ at a center-of-mass energy of 3.78 GeV. It will operate between 2 and 4.6 GeV in the center of mass. With this luminosity, the BESIII detector will be able to collect, for example, 10 billion $J/\psi$ events in one year of running. This will be a unique facility in the world opening many physics opportunities. BEPCII and BESIII are both currently being commissioned, first events have been obtained, and data taking will take place in fall 2008.