An automated bandwidth division for the LHCb upgrade trigger.

Q1 Computer Science

Computing and Software for Big Science Pub Date : 2025-01-01 Epub Date: 2025-05-21 DOI:10.1007/s41781-025-00139-2

T Evans, C Fitzpatrick, J Horswill

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Abstract

The upgraded Large Hadron Collider beauty (LHCb) experiment is the first detector based at a hadron collider using a fully software-based trigger. The first 'High Level Trigger' stage (HLT1) reduces the event rate from 30 MHz to approximately 1 MHz based on reconstruction criteria from the tracking system, and consists of $O (100)$ trigger selections implemented on Graphics Processing Units (GPUs). These selections are further refined following the full offline-quality reconstruction at the second stage (HLT2) prior to saving for analysis. An automated bandwidth division has been performed to equitably divide this 1 MHz HLT1 Output Rate (OR) between the signals of interest to the LHCb physics program. This was achieved by optimizing a set of trigger selections that maximize efficiency for signals of interest to LHCb while keeping the total HLT1 readout capped to a maximum. The bandwidth division tool has been used to determine the optimal selection for 35 selection algorithms over 80 characteristic physics channels.

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LHCb升级触发器的自动带宽划分。

升级后的大型强子对撞机（LHCb）实验是第一个基于强子对撞机的探测器，使用完全基于软件的触发器。第一个“高电平触发”阶段（HLT1）根据跟踪系统的重建标准将事件速率从30 MHz降低到大约1 MHz，并由在图形处理单元（gpu）上实现的O（100）个触发选择组成。在保存以供分析之前，在第二阶段（HLT2）进行完全脱机质量重建之后，这些选择将进一步细化。为了在LHCb物理程序感兴趣的信号之间公平地分配这1mhz HLT1输出速率（OR），已经执行了自动带宽划分。这是通过优化一组触发器选择来实现的，这些选择使LHCb感兴趣的信号的效率最大化，同时使总HLT1读出上限保持在最大值。带宽划分工具已用于确定超过80个特征物理信道的35种选择算法的最佳选择。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Computing and Software for Big Science Computer Science-Computer Science (miscellaneous)

CiteScore

6.20

自引率

0.00%

发文量