Consortium for the Development of a Trigger Processor for a High-Energy Physics Experiment

9977659本提案要求为基于加速器的高能物理实验的事件选择提供设备和工程支持，用于基于加速器的高能物理实验；费米实验室的D0实验。D0实验是费米实验室Tevatron对撞机的两个大型国际合作之一，预计将成为美国粒子物理工作的旗舰，直到瑞士日内瓦CERN实验室的LHC对撞机开始，预计在2005年后。在第一次运行中，D0实验已经在发现顶夸克、测量其质量、精确测量标准模型参数(如W玻色子的质量)以及对标准模型之外的现象的新约束方面取得了成果。随着升级的Tevatron对撞机的升级，D0实验有望进一步研究电弱力和顶夸克的性质。为了寻找衰变中的新粒子和产生新的作用力，预计将产生数千个顶级夸克。人们将直接寻找希格斯玻色子和其他弱电对称破缺的信号。这些过程的关键实验特征是存在b夸克，它们的寿命足够长，能量足够大，在衰变之前可以在距离主碰撞点几毫米的地方移动。提出者打算设计和建造一个快速处理器，从b夸克衰变的轻微位移的次级顶点识别与带电粒子一致的撞击模式。当数据从探测器中读出时，这必须在大约50微秒内完成。为了达到所需的速度，该设备将对来自硅微带跟踪器的数据进行高度并行处理。它将允许有效地将相对罕见的信号事件与更丰富的背景隔离开来。在探测器读出过程中探测这种次级顶点将是实验高能物理的新进展。它为选择具有重夸克的事件打开了戏剧性的新可能性。

9977659NarainThis proposal requests equipment and engineering support for the development of fast digital electronics for the event selection of an accelerator-based high-energy physics experiment; the D0 experiment at Fermilab.The D0 experiment is one of two large international collaborations at the Fermilab Tevatron collider which are expected to be the flagship of the US effort in particle physics until the start of the LHC collider at the CERN Laboratory in Geneva Switzerland, expected after year 2005. In its first run, the D0 experiment hasproduced results on the discovery of the top quark, a measurement of its mass, precise measurements of standard model parameters such as the mass of the W boson, and new constraints on phenomena beyond the standard model.With the upgraded Tevatron collider, the D0 experiment is expected to study further the properties of the electroweak force and the top quark. Thousands of top quarks are expected to be produced in a search for new particles in its decay and new forces in its production. There will be direct searches for the Higgs boson and other signatures of electroweak symmetry breaking. The key experimental signature of these processes is the presence of b quarks, which are sufficiently long-lived and sufficiently energetic on average to travel a few millimeters from the primary collision point before they decay.The proposers intend to design and build a fast processor to identify hit patterns consistent with charged particles from the slightly displaced secondary vertex characteristic of a b-quark decay. This must be accomplished in approximately 50 microseconds while the data are being read out of the detector. To achieve the required speed, the device will employ highly parallel processing of the data from the silicon microstrip tracker. It will allow efficient isolation of the relatively rare signal events from the much more copious background. Detecting such secondary vertices during detector readout would be a new advance for experimental high energy physics. It opens dramatic new possibilities for selecting events with heavy quarks.