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Search for new interactions in e-p Collision

搜索 e-p Collision 中的新交互

基本信息

批准号：
02402006
负责人：
YAMADA Sakue
金额：
$ 10.24万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

We studied possible existence of new interactions in electron-proton collisions at HERA at DESY in Germany by using a multi-purpose detector built in an international collaboration ZEUS.In the first two years, we completed the construction of ZEUS detector. The high-resolution uranium-scintillator calorimeter was calibrated with cosmic muons and installed into the experimental hall. The first level global trigger system was built with a pipeline technology. RISC workstations were installed at INS for the preparation of physics analyses. Software for physics simulation, data reconstruction and event display had been installed, In order to determine the trigger algorithm, physics events as well as background beam-gas interaction events were extensively generated with Monte Carlo technique by using the workstations. An international collaboration was organized for the simulation in order to obtain huge data sample, mainly with institutes in Canada, Germany and the Netherlands.In the final year, the electon-proton collision experiment started. It turned out that the trigger studies performed in the preceeding years were very useful. The trigger hardware proved to be extremely flexible and reliable. The energy resolution of the calorimeter was found to be as good as designed. Although the collected amount of data was rather limited (50 nb^<-1>), we measured the proton structure function in new kinematical regions. It was shown that the quark density in the proton increased as the momentum fraction of the proton carried by the quark decreases. A search of leptoquark was performed with the high-momentum transfer neutral-current deep-inelastic events, The lower bound on the leptoquark mass could be set to 170 GeV, in case the coupling strength is the same to the electro-weak interaction.

我们在德国DESY的HERA上利用国际合作的ZEUS多用途探测器研究了电子-质子碰撞中可能存在的新相互作用，在前两年完成了ZEUS探测器的建造。高分辨率铀闪烁体量热计用宇宙μ子校准并安装到实验大厅。第一级全局触发系统，采用流水线技术。在惯性导航系统上安装了RISC工作站，用于准备物理分析。在工作站上安装了物理模拟、数据重建和事件显示软件。为了确定触发算法，在工作站上用蒙特卡罗技术广泛地产生了物理事件和背景束-气相互作用事件。为了获得大量的数据样本，组织了一次国际合作，主要是与加拿大、德国和荷兰的研究所合作，最后一年开始了电子质子碰撞实验。事实证明，前几年进行的触发研究非常有用。触发器硬件被证明是非常灵活和可靠的。量热计的能量分辨率与设计的一样好。虽然收集的数据量相当有限（50 nb^<-1>），但我们测量了新的运动学区域的质子结构函数。结果表明，质子中的夸克密度随夸克携带的质子动量分数的减小而增大。用高动量转移中性流深非弹性事例搜索了轻夸克，在耦合强度与电-弱相互作用相同的情况下，轻夸克质量的下限可设为170 GeV.