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CMS Notes

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2025-11-10
10:38
Performance of the front-end electronics of the CMS electromagnetic calorimeter barrel for the High-Luminosity LHC / The CMS electromagnetic calorimeter group
The performance of the CMS electromagnetic calorimeter upgraded readout electronics, developed for the High-Luminosity phase of the LHC, is discussed. Data collected in two beam test campaigns conducted in 2018 and 2021 at the H4 and H2 beam lines of the CERN SPS are analyzed. [...]
CMS-NOTE-2025-013; CERN-CMS-NOTE-2025-013.- Geneva : CERN, 2025 - 23 p. Fulltext: PDF;

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2025-11-10
10:38
The Histogram Similarity Based Strategy for Performance Improvement of Multi-Class Classification with the Simulated CMS-HGCAL Data in Level-1 Trigger / Burazin Misura, Arijana (Split Tech. U.) ; Music, Josip (Split Tech. U.) ; Prvan, Marina (Split Tech. U.) ; Linda Vickovic
In the upcoming High-Luminosity (HL) phase of the Large Hadron Collider (LHC), the rates of proton-proton collisions will increase significantly, resulting in a substantial amount of data, including soft collisions or pile-up (PU). This study develops an algorithm for real-time selection of significant collision data in the Level 1 Trigger (L1T) system for the High Granularity Calorimeter (HGCAL) in the Compact Muon Solenoid (CMS) detector upgraded for the HL era. To conduct multi-class selection based on four types of data - electromagnetic showers (EM), PU, quantum chromodynamics (QCD) jets, and single pions, two machine learning architectures are explored: Convolutional Neural Networks (CNN) and Multi-Layer Perceptrons (MLP). [...]
CMS-NOTE-2025-012; CERN-CMS-NOTE-2025-012.- Geneva : CERN, 2025 - 25 p. Fulltext: PDF;

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2025-09-29
17:56
Measurement of four-point energy-energy correlator projections in Z+jets events / The CMS Collaboration /CMS Collaboration
Energy-energy correlators are rapidly emerging as a powerful tool for the study of jet substructure. The resolved structure of high-order EECs is sensitive to the detailed dynamics of jet formation, and has the potential to provide both a useful probe of quantum chromodynamics and a powerful input for tuning of phenomenological parton shower models. [...]
CMS-NOTE-2025-011; CERN-CMS-NOTE-2025-011.- Geneva : CERN, 2025 - 21 p. Fulltext: PDF;

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2025-09-29
17:56
Enhanced reconstruction of dileptonic top quark-antiquark events using supervised machine learning methods / CMS Collaboration /CMS Collaboration
The reconstruction of the top quark-antiquark $\mathrm{t\bar{t}}$ kinematic system is crucial for precision measurements of top quark properties and plays a central role in many searches for beyond standard model physics involving top quarks at the LHC. In the dileptonic decay channel of $\mathrm{t\bar{t}}$, the presence of two neutrinos poses a significant challenge to reconstruct the $\mathrm{t\bar{t}}$ kinematic system. [...]
CMS-NOTE-2025-010; CERN-CMS-NOTE-2025-010.- Geneva : CERN, 2025 - 22 p. Fulltext: PDF;

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2025-08-25
12:44
Evaluation of 3D pixel silicon sensors for the CMS Phase-2 Inner Tracker / CMS Tracker Group Collaboration
The high-luminosity upgrade of the CERN LHC requires the replacement of the CMS tracking detector to cope with the increased radiation fluence while maintaining its excellent performance. [...]
arXiv:2510.13304 ; CMS-NOTE-2025-009 ; CERN-CMS-NOTE-2025-009 ; CERN-CMS-NOTE-2025-009.
- 2024 - 33.
Full text - arXiv preprint - Fulltext

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2025-07-21
10:06
Projections for indirect searches for new physics in the production of top quarks in association with additional leptons / The CMS Collaboration /CMS Collaboration
In the context of the Update on the European Strategy in Particle Physics, we present the current expectation for the achievable sensitivity reach of indirect searches for new physics in top quark production in association with additional leptons. The projections are based on a global analysis in the effective field theory framework performed with data collected in the CMS experiment during the LHC Run 2..
CMS-NOTE-2025-008; CERN-CMS-NOTE-2025-008.- Geneva : CERN, 2025 - 15 p. Fulltext: PDF;

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2025-03-27
13:43
HL-LHC projections for single Higgs boson measurements at the CMS experiment / CMS Collaboration /CMS Collaboration
This note describes HL-LHC projection studies based on the Run 2 CMS measurements in the $\mathrm{H\rightarrow\gamma\gamma}$ and $\mathrm{H\rightarrow Z\gamma}$ decay channels. The expected constraints are extracted for integrated luminosities of 2000 and 3000 fb$^{-1}$. [...]
CMS-NOTE-2025-007; CERN-CMS-NOTE-2025-007.- Geneva : CERN, 2025 - 20 p. Fulltext: PDF;

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2025-03-27
13:43
Projection of CMS experimental reach on HH production at HL-LHC / CMS Collaboration /CMS Collaboration
This note presents an updated projection to the high-luminosity LHC for searches for resonant and nonresonant Higgs boson pair production with the CMS experiment. The projections are based on analyses of data recorded by the CMS experiment during LHC Run 2. [...]
CMS-NOTE-2025-006; CERN-CMS-NOTE-2025-006.- Geneva : CERN, 2025 - 11 p. Fulltext: PDF;

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2025-03-27
13:43
CMS Offline Software and Computing input to the European Strategy for Particle Physics - 2026 update / CMS Offline Software ; Computing
This document outlines the CMS Offline Software and Computing strategy in preparation for the High-Luminosity LHC (HL-LHC) era and serves as input to the 2026 update of the European Strategy for Particle Physics. As CMS faces a significant increase in data volume, event complexity, and computing demands in Phase-2, this report details the necessary evolution of software, computing models, infrastructure, and sustainability practices. [...]
CMS-NOTE-2025-005; CERN-CMS-NOTE-2025-005.- Geneva : CERN, 2025 - 14 p.

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2025-03-27
13:43
CMS flavor physics projections for the update of the European Strategy for Particle Physics / CMS Collaboration /CMS Collaboration
Projections of the CMS experiment's sensitivity at the HL-LHC to various flavour physics observables are presented. The results are based on measurements from the dataset collected by CMS during LHC Run 2 in proton-proton collisions at a center-of-mass energy of 13 TeV [...]
CMS-NOTE-2025-004; CERN-CMS-NOTE-2025-004.- Geneva : CERN, 2025 - 26 p. Fulltext: PDF;

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