Status of BES-III

✍ Scribed by A. Zhemchugov

• Book ID: 104071697
• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 189 KB
• Volume: 189
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/j.nuclphysbps.2009.03.057

✦ Synopsis

The BES-III experiment started operation in June, 2008, after major upgrade of the detector setup and accelerator BEPC. Luminosity of 1.2 × 10 32 cm -2 c -1 , which is 1/8 of the design one, has been achieved. Detector performance is close to the design one. Physics data taking started, at the center-of-mass energy of 3.686 GeV. At the moment, about of 10M of ψ(2S) decays have been recorded. Main goals of the experiment are the studies of charmonium physics, physics of charmed mesons, tau leptons and light hadron spectroscopy. Tau physics program is focused on the high-precision tau mass measurement, accurate determination of tau branching ratio and study of Lorentz structure of the weak charged current in lepton decays of tau.