2025-10-20
12:40 |
Validation of tau identification algorithms in Run 3 data and simulation
/CMS Collaboration
This note presents the performance of the identification of hadronic tau lepton decays ($\tau_\mathrm{h}$) across different run conditions. Data collected by the CMS detector in 2024 and 2025 are compared to the same Monte Carlo simulation. [...]
CMS-DP-2025-074; CERN-CMS-DP-2025-074.-
Geneva : CERN, 2025 - 21 p.
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2025-10-20
12:40 |
Comparison of the performance of tau reconstruction and identification algorithms in Run 3
/CMS Collaboration
In recent years, the CMS experiment has made several advancements in the identification of hadronically decaying tau leptons ($\tau_\mathrm{h}$) using advanced machine learning (ML) techniques. This note provides a comparison between the three ML-based $\tau_\mathrm{h}$ identification algorithms deployed by the CMS Collaboration during the LHC Run 3: DeepTau, PNet, and UParT. [...]
CMS-DP-2025-073; CERN-CMS-DP-2025-073.-
Geneva : CERN, 2025 - 22 p.
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2025-10-20
12:40 |
DT Background in 2025
/CMS Collaboration
The background intensities in different regions of the CMS Drift Tube detector were measured both online (using the currents drawn by the High Voltage power supplies) and offline (using the hit rates observed in proton proton collisions recorded with a minimum bias trigger). The two methods provided consistent results and particularly highlighted the effect of the forward shield installed during the previous Year End Technical Stop (YETS). [...]
CMS-DP-2025-072; CERN-CMS-DP-2025-072.-
Geneva : CERN, 2025 - 22 p.
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2025-10-06
10:55 |
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2025-10-06
10:55 |
DT Efficiency in 2025
/CMS Collaboration
The fraction of active channels, the hit efficiency and the local reconstruction efficiency of the CMS Drift Tubes were measured using 2025 data. Results are shown to be stable throughout Run 3, with only minor and well understood differences with respect to previous years..
CMS-DP-2025-070; CERN-CMS-DP-2025-070.-
Geneva : CERN, 2025 - 10 p.
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2025-09-29
17:56 |
Early Look at GEM-CSC Bending Angle Integration into the Level 1 Trigger
/CMS Collaboration
The High Luminosity LHC (HL-LHC) planned to start in 2030 will supply a dramatic increase in pile
up to the collision detectors. The CMS detector has many upgrades to handle this increase in pile
up, including the Gas Electron Multiplier (GEM) subdetector system for the Muon System. [...]
CMS-DP-2025-069; CERN-CMS-DP-2025-069.-
Geneva : CERN, 2025 - 7 p.
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2025-09-29
17:56 |
Exclusive dimuon production in ultraperipheral lead-lead collisions at 5.02 TeV
/CMS Collaboration
Exclusive dimuon production in lead-lead collisions is investigated for the first time as a novel approach for luminosity determination at the LHC. This method exploits the well-established theoretical framework of quantum electrodynamics (QED) to provide an alternative measurement of luminosity based on the predicted production cross section. [...]
CMS-DP-2025-068; CERN-CMS-DP-2025-068.-
Geneva : CERN, 2025 - 6 p.
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2025-09-29
17:55 |
PCC module selection and internal stability for 2024 luminosity measurement
/CMS Collaboration
Starting from all BPIX/FPIX modules, we remove known problematic regions, veto noisy modules from vdM super-separation periods, perform block-by-block stability screening, and impose a year-wide linearity requirement. The resulting subset provides robust PCC luminosity with improved temporal stability, suitable for use with a single $\sigma_{\mathrm{vis}}$ once $R$ is corrected..
CMS-DP-2025-067; CERN-CMS-DP-2025-067.-
Geneva : CERN, 2025 - 7 p.
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2025-09-29
17:55 |
HFET luminosity and afterglow corrections
/CMS Collaboration
The HFET luminometer converts transverse-energy sums to luminosity but requires out-of-time corrections. We separate Type-1 spillover (electronics/timing) from Type-2 activation tails modeled as $A e^{-t/\tau_1}+B e^{-t/\tau_2}$, constrained with single-/few-bunch fills; after applying both, residual empty-BX signal approaches zero and cross-checks (e.g. [...]
CMS-DP-2025-066; CERN-CMS-DP-2025-066.-
Geneva : CERN, 2025 - 14 p.
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2025-09-29
17:55 |
Z counting in 2024
/CMS Collaboration
$Z\to\ell\ell$ yields provide a physics-based cross-check of online luminosity. Fill-level and yearly trends of $Z/\text{online}$ remain stable at the percent level while reflecting updates to online calibrations (vdM/efficiency), validating the delivered luminosity scale independently of luminometer-specific assumptions..
CMS-DP-2025-065; CERN-CMS-DP-2025-065.-
Geneva : CERN, 2025 - 4 p.
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