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CMS Detector Performance Summaries

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2026-02-03
13:21
Background Particle Response of CMS GEM Detectors with Run 3 Data and Simulation /CMS Collaboration
The LHC is a high-radiation environment: the colliding beams and beam-matter interactions create an intense, complex radiation field, particularly in the endcap region where new GEM detectors have been and will be installed. This study updates the simulation of the GEM background rate for Run 3, using FLUKA and GEANT4 simulations, and compares the simulation to the in-situ measured rate. [...]
CMS-DP-2026-006; CERN-CMS-DP-2026-006.- Geneva : CERN, 2026 - 15 p. Fulltext: PDF;

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2026-02-03
13:21
Anomaly detection in data quality with machine learning models for the CMS pixel detector /CMS Collaboration
CMS data quality monitoring and certification relies on the human inspection of hundreds of histograms, to classify data as either "good" or "bad" (i.e. not to be used for physics analyses). [...]
CMS-DP-2026-005; CERN-CMS-DP-2026-005.- Geneva : CERN, 2026 - 32 p. Fulltext: PDF;

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2026-02-03
13:21
CMS Resource Projection Study for HL-LHC /CMS Collaboration
The note shows the CMS resource (CPU, disk, and tape) projection study for HL-LHC..
CMS-DP-2026-004; CERN-CMS-DP-2026-004.- Geneva : CERN, 2026 - 9 p. Fulltext: PDF;

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2026-01-12
14:10
Measurement of the integrated luminosity with the CMS proton-proton dataset at $\sqrt{s} = 13.6$ TeV recorded in 2024 /CMS Collaboration
A preliminary analysis of the offline luminosity in the 2024 proton-proton collision data at CMS has been performed using the HFET, PLT, PCC, BCM1F (VME), DT, and RAMSES luminometers. The luminometers, with the exception of DT and RAMSES, were calibrated using the vdM method, with data collected in LHC Fill 9639. [...]
CMS-DP-2026-003; CERN-CMS-DP-2026-003.- Geneva : CERN, 2026 - 31 p. Fulltext: PDF;

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2026-01-12
14:10
Offloading part of the HLT reconstruction to remote GPUs using MPI /CMS Collaboration
This note presents the impact of offloading part of the CMS High Level Trigger (HLT) reconstruction to remote GPUs using MPI. The HLT throughput is compared for several execution models. [...]
CMS-DP-2026-002; CERN-CMS-DP-2026-002.- Geneva : CERN, 2026 - 6 p. Fulltext: PDF;

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2026-01-05
16:45
Performances of new dielectron and diphoton triggers targeting low mass and/or boosted topologies /CMS Collaboration
This note presents performances of a set of new triggers introduced for the 2025 data taking of CMS, which target pairs of isolated photons or electrons of moderate transverse energy ($E_{\mathrm T} \approx 10 \text{--} 15$ GeV)..
CMS-DP-2026-001; CERN-CMS-DP-2026-001.- Geneva : CERN, 2026 - 14 p. Fulltext: PDF;

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2025-12-15
16:47
Performance of the parking Upsilon triggers in 2025 /CMS Collaboration
This note presents the performance of the triggers targeting $\Upsilon(\mathrm{nS}) \rightarrow \mu\mu$ decays that were part of the CMS High Level Trigger (HLT) menu during the 2025 data-taking period..
CMS-DP-2025-088; CERN-CMS-DP-2025-088.- Geneva : CERN, 2025 - 5 p.

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2025-12-15
16:47
Profiling the CMS reconstruction options within the Calibration Loop /CMS Collaboration
This notes presents profiling results of the CMS Prompt Calibration Loop, aiming at delivering detector conditions within 48h of data taking to promptly reconstruct the CMS data using Tier0 resources. We present the performance of an alternative reconstruction configuration, with reduced tracking iterations, in order to deliver a subset of calibration constants within an 8h target and limited computing power..
CMS-DP-2025-087; CERN-CMS-DP-2025-087.- Geneva : CERN, 2025 - 9 p. Fulltext: PDF;

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2025-12-15
16:47
Performances of a high rate single photon trigger in Run 3 /CMS Collaboration
This note presents the performances of a new trigger requiring the presence of an isolated photon with moderate transverse energy (ET $\approx$ 40-50 GeV) in the barrel region of the CMS detector ($\lvert\eta\rvert < 1.479$) deployed for the 2024 and 2025 data takings. The achieved threshold represents a reduction by more than a factor two with respect to previous data takings (110 GeV), opening the acceptance for a variety of analyses, including searches for Higgs decay into a photon and hadrons or missing transverse energy and searches relying on the presence of a photon radiation from the initial or final state. [...]
CMS-DP-2025-086; CERN-CMS-DP-2025-086.- Geneva : CERN, 2025 - 7 p. Fulltext: PDF;

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2025-12-01
19:26
Enhancing CMS Passive Material Modeling in Track Reconstruction Using ACTS /CMS Collaboration
This exploratory study investigates whether the modelling of passive material in CMS track reconstruction can be improved through the use of an external software framework, A Common Tracking Software (ACTS)..
CMS-DP-2025-085; CERN-CMS-DP-2025-085.- Geneva : CERN, 2025 - 5 p. Fulltext: PDF;

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