Higgs search by means of τ vertex tagging

在美国费米实验室，运行II实验在Tevatron加速器和CDF和D0探测器升级后于2001年开始。τ轻子候选者被标记，其中孤立和奇数轨道表明τ衰变，在运行II的触发水平。CDF的高性能硅跟踪系统可以测量衰变长度有限的τ轻子体的碰撞参数。预计撞击参数将提高τ识别纯度。我们模拟了希格斯粒子的搜索区域，假设积分光度为2 fb^<-1>，这是运行II第一阶段的目标。我们的分析方法将在获得真实的数据后尽快用于希格斯粒子的搜寻。在探测器研究方面，我们研制了有效的τ轻子示踪硅微带探测器。如下页所列的论文所示，我们实现了抗辐射、无死时间的高速读出和高分辨率探测器。由于希格斯粒子的搜寻是一个对诺贝尔奖有价值的伟大课题，因此无法以这种规模的预算完成。我们正在申请下一个预算，以扩大我们的希格斯粒子搜索。

At Fermilab in USA, Run II experiment started in 2001 after the upgrade of Tevatron accelerator and CDF and D0 detectors. Tau lepton candidates are tagged, where isolated and odd number tracks suggest τ decays, at a trigger level in Run II. High performance of the silicon tracking system of CDF can measure the impact parameters of the daughters of τ leptons whose decay lengths are finite. The impact parameters are expected to enhance τ identification purity. We simulated Higgs search region assuming 2 fb^<-1> of integrated luminosity which is the goal of the first stage of Run II. Our analysis method will be used for the Higgs search as soon as real data will be available.For detector studies, silicon microstrip detectors efficient for τ lepton tagging were developed. As shown in our papers listed on the next page, we achieved rad-hard, dead-time-less high-speed readout and high-resolution detectors.This study showed the method of the Higgs search by means of τ vertex tagging. Since the Higgs search is a great subject valuable for a Nobel prize, it can not be completed with the budget of this scale. We are applying the next budget to extend our Higgs search.