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CMS Detector Performance Summaries

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2026-02-11
16:14
Performance of Hadronic Tau Reconstruction at the High Level Trigger using 2024 Data from the CMS Experiment at CERN /CMS Collaboration
This note presents performance studies on the reconstruction of hadronic tau leptons in the CMS High Level Trigger (HLT) using proton-proton data collected in 2024 at a center of mass energy of 13.6 TeV. The hadronic tau object performance is measured using the Tag and Probe technique on events triggered by an isolated muon with $p_{\text{T}} > 24$~GeV, targeting the decay $Z\rightarrow\tau\tau\rightarrow\mu\tau_{h}$ [...]
CMS-DP-2026-008; CERN-CMS-DP-2026-008.- Geneva : CERN, 2026 - 23 p. Fulltext: PDF;

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2026-02-11
16:14
Performance of muon reconstruction in the CMS High-Level Trigger using pp collision data at $\sqrt{s} = 13.6$~TeV in 2025 /CMS Collaboration
This note presents single muon-trigger efficiencies measured with data collected in 2025, corresponding to an integrated luminosity of 112.0 fb$^{-1}$. The performance is compared with data collected in 2022, 2023, and 2024, corresponding to an integrated luminosity of 34.2, 27.2, and 109.0 fb$^{-1}$, respectively
CMS-DP-2026-007; CERN-CMS-DP-2026-007.- Geneva : CERN, 2026 - 14 p. Fulltext: PDF;

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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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