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CMS Detector Performance Summaries

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2025-06-23
11:04
Multiclass object tagging in the CMS Phase-2 Level-1 Correlator Trigger /CMS Collaboration
Following developments in offline jet flavour tagging, this note introduces a new machine learning (ML) based multiclass jet tagging for the Phase-2 Upgrade of the CMS Level-1 Trigger (L1T), trained on a variety of target classes. Jet tagging will take place in the Correlator subsystem of the Phase-2 L1T. [...]
CMS-DP-2025-032; CERN-CMS-DP-2025-032.- Geneva : CERN, 2025 - 23 p. Fulltext: PDF;

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2025-06-23
11:04
Data Reduction of the strip detector of the CMS Experiment for heavy ion collisions and proton-proton collisions /CMS Collaboration
Reducing event and data sizes is critical for experiments at the LHC, where high collision rates and increased detector granularity rapidly increase storage and processing requirements. In the CMS experiment, a recent development to address this challenge is the "Raw'" format: a new approach for recording silicon strip data in which only the reconstructed cluster's barycenter and average charge are stored, rather than the analog-to-digital converter counts from every strip. [...]
CMS-DP-2025-031; CERN-CMS-DP-2025-031.- Geneva : CERN, 2025 - 27 p. Fulltext: PDF;

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2025-06-23
11:04
Anomaly detection for the CMS Pixel Barrel Data Quality with Machine Learning models /CMS Collaboration
CMS Offline Data Quality relies on the human inspection of hundreds of histograms, to classify data as Good or Bad for physics analyses. However, this process is prone to human error, such as oversights, misinterpretations, or subjective assessments. [...]
CMS-DP-2025-030; CERN-CMS-DP-2025-030.- Geneva : CERN, 2025 - 15 p. Fulltext: PDF;

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2025-06-23
11:04
CMS Tracker Alignment Performance Results for 2024 Data Taking and Early Reprocessing /CMS Collaboration
The tracking system of the CMS experiment is the world's largest silicon tracker with its 1856 and 15148 silicon pixel and strip modules, respectively. To accurately reconstruct trajectories of charged particles the position, rotation, and curvature of each module must be corrected such that the alignment resolution is smaller than, or comparable to, the hit resolution. [...]
CMS-DP-2025-029; CERN-CMS-DP-2025-029.- Geneva : CERN, 2025 - 31 p. Fulltext: PDF;

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2025-06-23
11:04
CPU performance evolution of Full and Fast simulations from Run-2 to Run-3 and Full simulations for Phase-2 design /CMS Collaboration
The following plots show the historical trends of the CMS detector simulation time. The first figure illustrates the Full and Fast Simulation CPU time performance of Run-2/13 TeV and Run-3/14 TeV data. [...]
CMS-DP-2025-028; CERN-CMS-DP-2025-028.- Geneva : CERN, 2025 - 8 p. Fulltext: PDF;

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2025-06-23
11:04
ECAL performance with 2025 data: $\pi^{0}$ monitoring and spike contamination /CMS Collaboration
ECAL performance with 2025 data: $\pi^{0}$ monitoring and spike contamination..
CMS-DP-2025-027; CERN-CMS-DP-2025-027.- Geneva : CERN, 2025 - 6 p. Fulltext: PDF;

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2025-06-23
11:04
CMS tracking performance in 2024 /CMS Collaboration
This note presents the results of comparisons between data and Monte Carlo simulated events for tracking-related reconstructed observables. The analysis is based on data collected during 13.6 TeV proton-proton collisions in 2024. [...]
CMS-DP-2025-026; CERN-CMS-DP-2025-026.- Geneva : CERN, 2025 - 24 p. Fulltext: PDF;

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2025-06-16
12:22
HLT Scouting performance in 2024: muon triggers and objects /CMS Collaboration
This note presents results on the physics performance of the muons reconstructed in the HLT-scouting triggers in 2024 pp data..
CMS-DP-2025-025; CERN-CMS-DP-2025-025.- Geneva : CERN, 2025 - 20 p. Fulltext: PDF;

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2025-06-16
12:22
Time resolution of the diamond detectors in the CMS Precision Proton Spectrometer in 2024 /CMS Collaboration
The Precision Proton Spectrometer (PPS) is a forward-proton spectrometer using near-beam detectors (inside Roman Pots, RPs) located symmetrically on both sides of IP5 at a distance of about 220 m. In addition to the tracking system, the timing detectors measure the Time-Of-Flight (TOF) of the protons produced in central exclusive interactions. [...]
CMS-DP-2025-024; CERN-CMS-DP-2025-024.- Geneva : CERN, 2025 - 13 p. Fulltext: PDF;

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2025-05-26
14:43
Improved missing transverse energy estimation using jet energy resolution in the CMS Phase-2 Level-1 Trigger /CMS Collaboration
The High-Luminosity LHC (HL-LHC) will result in a high number of simultaneous inelastic proton-proton interactions (pileup), posing challenges for realtime event selection. As part of the CMS Phase-2 upgrade, the Level-1 (L1) Trigger system is being redesigned to incorporate detailed detector information for improved trigger performance. [...]
CMS-DP-2025-023; CERN-CMS-DP-2025-023.- Geneva : CERN, 2025 - 11 p. Fulltext: PDF;

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