用LHC的CMS实验研究重离子碰撞中硬探针的触发
Triggering on Hard Probes in Heavy-Ion Collisions with the CMS Experiment at the LHC
摘要：
在大型强子对撞机上对重离子碰撞的研究将受益于一系列在较低碰撞能量下不容易获得的定性新探测器。这些包括ET > 50 GeV的完全形成的喷流，Z0和大量产生的重口味。对于运行在LHC设计光度下的Pb+Pb，CMS相互作用区的碰撞率将超过可用带宽来存储数据几个数量级。因此，需要一个有效的触发器策略来选择包含最感兴趣的签名的传入事件的百分之几。在本报告中，我们将介绍为CMS实验的独特双层触发系统开发的重离子触发策略，该系统由基于定制电子设备的"1级“触发器和使用大型商品计算机集群实现的高级别触发器（HLT）组成。
英文摘要：
Studies of heavy-ion collisions at the LHC will benefit from an array of qualitatively new probes not readily available at lower collision energies. These include fully formed jets at ET > 50 GeV, Z0's and abundantly produced heavy flavors. For Pb+Pb running at LHC design luminosity, the collision rate in the CMS interaction region will exceed the available bandwidth to store data by several orders of magnitude. Therefore an efficient trigger strategy is needed to select the few percent of the incoming events containing the most interesting signatures. In this report, we will present the heavy-ion trigger strategy developed for the unique two-layer trigger system of the CMS experiment which consists of a ``Level-1'' trigger based on custom electronics and a High Level Trigger (HLT) implemented using a large cluster of commodity computers.
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