Bepcii and Besiii
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.
Measurements of the cross section for e(+)e(-) --> hadrons at center-of-mass energies from 2 to 5 GeV.
We report values of R = sigma(e(+)e(-)-->hadrons)/sigma(e(+)e(-)-->mu(+)mu(-)) for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider.
A laser calibration system for the KEK TOPAZ barrel TOF counters: Its performance and the characteristics of its major components
Abstract A compact and nearly maintenance-free timing calibration system using a dye laser has been constructed for the KEK TRISTAN TOPAZ barrel TOF counter system. Its timing resolution has been measured to be about 50 ps. The characteristics of its major components have been obtained so as to thoroughly understand their functions and performances.