Abstract
The CMS experiment has been designed with a 2-level trigger system the Level 1 Trigger, implemented on custom-designed electronics, and the High Level Trigger, a streamlined version of the CMS offline reconstruction software running on a computer farm. In this poster we will present the performance with the specific algorithms developed to cope with the increasing LHC pile-up and bunch crossing rate using 13 TeV data during 2015, and prospects for improvements brought to both L1T and HLT strategies to meet the new challenges for 2016 scenarios with a peak instantaneous luminosity of 1.2× 1034cm−2s−1 and 30 pileup events. Presented at LHCP2016 Fourth annual Large Hadron Collider Physics The High Level Trigger of the CMS experiment Xuyang Gao (on behalf of the CMS Collaboration)∗ Beihang University (CN) E-mail: gaoxy@buaa.edu.cn The CMS experiment has been designed with a 2-level trigger system, the Level 1 Trigger (L1), implemented on custom-designed electronics, and the High Level Trigger (HLT), a streamlined version of the CMS off-line reconstruction software running on a computer farm. We will present the performance with the specific algorithms developed to cope with the increasing LHC pileup and bunch crossing rate using 13 TeV data during 2015, and prospects for improvements brought to both L1 and HLT strategies to meet the new challenges for 2016 scenarios with a peak instantaneous luminosity of 1.2×1034cm−2s−1 and 30 pileup events. Fourth Annual Large Hadron Collider Physics 13-18 June 2016 Lund, Sweden ∗Speaker. c © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). http://pos.sissa.it/ The High Level Trigger of the CMS experiment Xuyang Gao (on behalf of the CMS Collaboration)
Highlights
The role of the trigger in a High Energy Physics experiment is to reduce the rate of recorded collision events to a level which is manageable by the following Data Acquisition (DAQ) and Reconstruction steps
The CMS experiment [1] has been designed with a 2-level trigger system, the Level 1 Trigger (L1), implemented on custom-designed electronics, and the High Level Trigger (HLT), a streamlined version of the CMS off-line reconstruction software running on a computer farm
The HLT software has been optimized for these conditions, balancing a high selection efficiency on signal events while keeping the output rate at acceptable levels both for the online data acquisition system and the offline prompt reconstruction [2]
Summary
The role of the trigger in a High Energy Physics experiment is to reduce the rate of recorded collision events to a level which is manageable by the following Data Acquisition (DAQ) and Reconstruction steps. At LHC the proton beams are organized in bunches. Those bunches were interleaved by 50 ns during the Run period and 25 ns at Run. The HLT software has been optimized for these conditions, balancing a high selection efficiency on signal events while keeping the output rate at acceptable levels both for the online data acquisition system and the offline prompt reconstruction [2]
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