Study of Heavy Quark Physics with the BaBar Detector

这项建议要求支持斯坦福大学一个小组的实验粒子物理研究计划，该小组的主要目标是通过研究含有底夸克的介子的衰变来阐明CP破坏的来源。该计划将在斯坦福直线加速器中心(SLAC)使用BABAR探测器和PEP-II存储环进行。在BABAR的合作中，该团队负责硅顶点跟踪器(SVT)的所有探测器监测和控制硬件，以及SVT数据采集软件。在本请求期间，该集团打算维护他们设计、建造和委托使用的SVT系统：束管附近基于PIN二极管的辐射监测和束流联锁系统、SVT和漂移室的位置监测系统、SVT读出电子设备的温度监测和电源联锁系统以及SVT的气体和流体监测系统。主计长最近完成了为期一年的物理分析协调员(PAC)的任期，之后又完成了副PAC的任期。在她担任PAC期间，Babar的合作在日本大阪举行的国际高能物理会议上公布了关于CP破坏阶段、b、B寿命、B0 B0-bar混合率、辐射企鹅衰变、无魅力强子B衰变以及其他分析的第一批初步结果。斯坦福大学的研究小组对生命周期、混合和CP分析的各个方面做出了贡献。这个小组的重点将是继续分析巴布尔数据，集中在B的寿命和混合，罕见的衰变，如B+-t+NT和B+-K+n-bar，以及魅力重子物理。

This proposal requests support for the research program in experimental particle physics of a Stanford University group whose primary goal is the elucidation of the source of CP violation through the study of the decay of mesons containing the bottom quark. The program will be carried out with the BaBar detector and PEP-II storage ring at the Stanford Linear Accelerator Center (SLAC). Within the BaBar collaboration, this group has been responsible for all detector monitoring and control hardware for the Silicon Vertex Tracker (SVT), and for the SVT data acquisition software. In the period of this request, the group intends to maintain the SVT systems they designed, built and commissioned: a radiation monitoring and beam interlock system based on PIN diodes near the beam pipe, a position-monitoring system for the SVT and drift chamber, a temperature monitoring and power supply interlock system for the SVT readout electronics, and a gas and fluid monitoring system for the SVT. The PI recently completed a one-year term as Physics Analysis Coordinator (PAC), preceded by a term as Deputy PAC. During her term as PAC, the BaBar collaboration presented its first preliminary results on the CP-violating phase, b, the B lifetimes, the B0 B0-bar mixing rate, radiative Penguin decays, charmless hadronic B decays, and other analyses at the International Conference on High Energy Physics in Osaka, Japan. The Stanford group contributed to various aspects of the lifetime, mixing, and CP analyses. The focus of this group will be on continued analysis of BaBar data, concentrating on B lifetimes and mixing, rare decays such as B+ - t+ nt and B+ - K+ n n-bar, and charm baryon physics.