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Development of TOF Systems for Future e+e-Collider Experiments

用于未来电子对撞机实验的 TOF 系统开发

基本信息

批准号：
17340067
负责人：
KOMAMIYA Sachio
金额：
$ 10.19万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

The aim of this research is to develop TOF systems for future e+e- collider experiments. Especially for BES-III experiment at IHEP Beijing and the GLD detector for the International Linear Collider (ILC).We contributed on the development and the design of the TOF system for the BES-III experiment. We measured gain of about 500 photomultipliers in the 1T magnetic field for the BES-III TOF system. For this purpose we construct a test-bench of the photomultipliers at KEK using an existing 1T normal conducting magnet. This test was successfully done. All the photomultipliers are now installed in the BES-III detector and are working well.To gain the knowledge on particle identification in the e+e- collider experiments, we analyzed BES-II data. Particularly we studied proton identification from charged kaons or pions.In the analysis we made precision measurement of branching fractions for baryon-antibaryon pair production from J/psi meson decays.For the GLD detector at the International Linear Collider the TOF function is embedded partially in the calorimeter. We demonstrated that the energy resolution of jets is improved with the energy flow algorithm using the TOF information. The energy deposit due to a charged particle can be identified including the TOF information.

本研究的目的是为未来的电子对撞机实验开发TOF系统。特别是北京IHEP的BES-III实验和国际直线对撞机（ILC）的GLD探测器。我们参与了BES-III实验TOF系统的开发和设计。我们测量了大约500个光电倍增管在1T磁场下的增益，用于BES-III TOF系统。为此，我们利用现有的1T法导磁体在KEK建立了光电倍增管的试验台。这次测试成功了。所有光电倍增管现在都安装在BES-III探测器上，并且工作良好。为了获得e+e对撞机实验中粒子识别的相关知识，我们对BES-II数据进行了分析。我们特别研究了带电介子和介子的质子识别。在分析中，我们精确测量了J/psi介子衰变产生重子-反重子对的分支分数。对于国际直线对撞机的GLD探测器，TOF函数部分嵌入量热计中。我们证明了利用TOF信息的能量流算法可以提高射流的能量分辨率。由于带电粒子的能量沉积可以被识别，包括TOF信息。