CERN Accelerating science

CMS Note
Report number	CMS-CR-2024-207
Title	Performance of CMS Level-1 Trigger Data Scouting during LHC Run 3
Author(s)	Giorgetti, Sabrina (INFN, Padua)
Publication	2024
Collaboration	CMS Collaboration
Imprint	19 Sep 2024
Number of pages	4
Presented at	42nd International Conference on High Energy Physics (ICHEP 2024), Prague, Czech Republic, 18 - 24 Jul 2024
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Keywords	General
Abstract	The CMS Level-1 Trigger Data Scouting (L1DS) system represents an innovative approach within the CMS experiment, enabling the acquisition and processing of Level-1 Trigger (L1T) objects at the full LHC bunch-crossing (BX) rate of 40 MHz. The system will be fully deployed as part of the CMS Phase-2 Upgrade at the High-Luminosity LHC (HL-LHC), harnessing the improved Phase-2 L1T design, featuring tracker and high-granularity calorimeter data for the first time. This trigger-less infrastructure has the potential to enhance CMS's sensitivity to signatures that could be limited by the current search phase space, and that are generally challenging to detect with traditional systems, such as rare decays, light resonances, and exotic signatures. Since the start of LHC Run 3, the L1DS demonstrator has been actively collecting muons and calorimeter objects. Initial analyses of the L1DS data have focused on characterizing this novel dataset, offering significant insights into the system's performance. These results not only showcase the functionality of the L1DS infrastructure but also highlight its potential for further applications.