CMS Experiment at CERN and HERA-B Experiment at DESY

本提案要求支持加州大学洛杉矶分校的一个小组进行(a)目前正在瑞士日内瓦CERN实验室建造的CMS实验，以及(b)目前在德国汉堡DESY实验室收集数据的HERA-B实验。欧洲核子研究中心大型强子对撞机（LHC）的CMS实验将研究质心能量为14 TeV的质子-质子相互作用。物理项目包括探测夸克和轻子的子结构和新的重规玻色子，电弱对称破缺和质量的起源，顶夸克产生和衰变的性质，cp违和和其他b介子衰变中的罕见现象，以及寻找超对称粒子和其他超越标准模型的现象。加州大学洛杉矶分校的研究小组将把精力集中在“更高层次”的触发和数据采集（DAQ）领域。此外，他们还将为CMS低强度b物理运行做准备，这将是LHC早期运行的主要组成部分，并将在以后的b射流标记中发挥重要作用。HERA-B实验的目的是发现和研究b介子衰变中的cp破坏和其他主题。HERA- b是HERA质子存储环正向的“固定目标”实验，在存储束的光晕中使用线靶，在真空管内使用硅微顶点探测器。主要目标是测量cp -违和参数sin(2b)，用于与电子-正电子“b工厂”相媲美的衰变Bd J/Y KS。他们预计到2000年夏天将测量到400次这样的事件。

This proposal requests support for a group at the University of California Los Angeles to work on (a) the CMS experiment currently being built for running at the CERN Laboratory in Geneva, Switzerland, and (b) the HERA-B experiment currently taking data at the DESY Laboratory in Hamburg, Germany. The CMS experiment at the CERN Large Hadron Collider (LHC) will investigate proton-proton interactions at a center-of-mass energy of 14 TeV. The physics program includes probing for quark and lepton substructure and new heavy gauge bosons, electroweak symmetry breaking and the origin of mass, properties of top-quark production and decay, CP-violation and other rare phenomena in B-meson decay and the search for supersymmetric particles and other phenomena beyond the Standard Model. The UCLA group will focus its efforts on the "higher-level" trigger and data acquisition (DAQ) areas. In addition, they will prepare for the CMS low-intensity B-physics running which will be a major component in early LHC running and will later be important for b-jet tagging of more exotic states. The objective of the HERA-B experiment is the discovery and study of CP-violation and other topics in B-meson decay. HERA-B is a "fixed-target" experiment in the forward direction at the HERA proton storage ring that uses wire targets in the halo of the stored beam and a silicon microvertex detector inside the vacuum pipe. The primary goal is measurement of the CP-violation parameter, sin(2b), for the decay Bd J/Y KS comparable to that of an electron-positron "b-factory". They expect to measure 400 such events by the summer of 2000.