北京正负电子对撞机重大改造工程和BESⅢ物理成果

1988年建成的北京正负电子对撞机(BEPC)使我国在国际高能物理研究领域占据了一席之地,在τ-粲物理研究中居于领先地位.面对激烈的国际竞争,中国科学家提出了对BEPC进行重大改造的计划,即BEPCⅡ.工程从2004年初开始建设,经过5年的努力,按指标、按计划、按预算、高质量地完成了各项建设任务,于2009年7月通过了国家验收,随即投入实验运行,取得了若干重大成果,使我国继续保持在粲物理研究的国际领先地位.本文简要回顾BEPC的情况,着重叙述BEPCⅡ的科学目标、BEPCⅡ加速器、BESⅢ探测器和取得的主要物理成果,并展望了下一步的研究工作和目标.

Major upgrade for the Beijing Electron-Positron Collider and its physics results

The Beijing Electron-Positron Collider （BEPC） completed in 1988 has brought China into the field of international particle physics research, taking the leading position in the τ-charm physics. Facing to the international keen competition in this research field, Chinese physicists proposed the project of major upgrade for the Beijing Electron-Positron Collider, i.e. BEPCII. Started in early 2004, the BEPCII project was successfully completed in 2008 with excellent quality, and checked and accepted by the state in July 2009. Since then, the collider has operated for high energy physics experiments as well as for synchrotron radiation application, keeping a leading position in the τ-charm physics. Briefly reviewing BEPC, this paper emphasizes the scientific goal of BEPCII, its accelerators, the BESIII detector and physics results as well as research plans and prospects.