Cover Story 2009, Volume 4 Issue 1
The BES-III (Beijing Sprectrometer III) detector, a general purpose solenoidal high performance detector located at the Beijing Electron-Positron Collider (BEPC-II), is designed to study the tau-charm physics at the center of mass energy of 2.0 to 4.6 GeV. It is 11 m long, 6 m wide, 9 m high and a total weight of about 700 ton, and consists of a drift chamber (MDC) which has a small cell structure filled with a helium-based gas, an electromagnetic calorimeter (EMC) made of CsI(Tl) crystals, time-of-flight counters (TOF) for particle identification made of plastic scintillators, a muon system made of Resistive Plate Chambers (RPC) and a super conducting magnet. The detector was finally installed into the assigned position in 2008 and has already been operated to collect data. The cover image shows the cross-section of BES-III. Please refer to the article “Charm physics — A field full of challenges and opportunities” by Professor Xue-qian LI et al. in this issue for details. [Photo credits: Prof. Xue-qian LI (李学潜) (Nankai University, China)][Detail] ...