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CMS Detector Performance Summaries

Derniers ajouts:
2024-02-26
17:49
Evolution of the High-Level Trigger output rates of the CMS experiment from 2012 to 2023 /CMS Collaboration
This note presents a plot of the average High-Level Trigger (HLT) output rates for one Fill of every CMS data-taking year of proton-proton (pp) collisions from 2012 to 2023. The corresponding average instantaneous luminosity delivered during the Fill is shown as well..
CMS-DP-2024-012; CERN-CMS-DP-2024-012.- Geneva : CERN, 2024 - 6 p. Fulltext: PDF;

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2024-02-26
17:49
Displaced tracking and vertexing calibration using neutral K mesons /CMS Collaboration
This note presents a study of the modeling accuracy of displaced tracking and vertexing. We consider the displaced decays of neutral K mesons to oppositely charged pions as a function of the radial displacement of the decay vertex with respect to the primary vertex in the event. [...]
CMS-DP-2024-010; CERN-CMS-DP-2024-010.- Geneva : CERN, 2024 - 16 p. Fulltext: PDF;

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2024-02-26
17:49
PPS Performance: first evaluation of the two-arm vertex resolution with timing detectors in 2023 /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. In 2023, one cylindrical and one box RPs on each sector were equipped with Diamond sensors: the TOF system consisted of four and three double-diamond planes, respectively. This note describes the resolution of the timing system in two-arm events, where both interacting protons are detected by the PPS detectors. Using low pileup data ($\mu$ = interactions/crossing = 1) and selecting central diffractive events a strong correlation is observed between the time difference of the protons detected in PPS, and the longitudinal vertex position reconstructed in the central CMS tracker..
CMS-DP-2024-009; CERN-CMS-DP-2024-009.- Geneva : CERN, 2024 - 11 p. Fulltext: PDF;

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2024-02-26
17:43
PPS: performance in Run 3 and efficiency of the pixel detector /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. The tracking system consists of four RPs equipped with 3D pixel sensors. Each RP unit consists of 6 sensor planes and an internal movement system. This note reports the luminosity collected with the RP inserted in 2023, preliminary performance of the new Pixel sensors and of the internal vertical movement system. In addition, a first evaluation of the effect of non-uniform irradiation on the readout chip, and its consequences on the efficiency, is presented..
CMS-DP-2024-008; CERN-CMS-DP-2024-008.- Geneva : CERN, 2024 - 21 p. Fulltext: PDF;

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2024-02-07
13:00
Single and Double Electron Trigger Efficiencies using the full Run 2 dataset /CMS Collaboration
This note describes electron trigger performance (L1+HLT) with the full Run 2 data sample, corresponding to an integrated luminosity of 136.1 fb$^{-1}$..
CMS-DP-2020-016; CERN-CMS-DP-2020-016.- Geneva : CERN, 2020 - 45 p. Fulltext: PDF;

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2024-02-07
13:00
Data reconstruction and simulation modeling of the Bremsstrahlung-induced electron momentum loss in Z to ee events collected at the CMS experiment at 13.6 TeV in 2022 /CMS Collaboration
This note presents the modelling of Bremsstrahlung-induced electron momentum loss for electrons in Z to ee candidate events in data collected in proton-proton collisions at \sqrt{s} = 13.6 TeV and is compared to the modelling of the same in simulation. Good agreement is seen for electrons in both barrel and endcap regions of the detector..
CMS-DP-2024-006; CERN-CMS-DP-2024-006.- Geneva : CERN, 2023 - 5 p. Fulltext: PDF;

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2024-02-05
10:57
Performance of Muon Reconstruction in the CMS High Level Trigger using pp Collision data at $\sqrt{s}$ = 13.6 TeV in 2023 /CMS Collaboration
This note presents muon-trigger efficiencies measured with the data collected in 2023 corresponding to an integrated luminosity of 27 fb$^{-1}$, and the performance is compared with the data collected in 2022 corresponding to an integrated luminosity of 35 fb$^{-1}$..
CMS-DP-2024-005; CERN-CMS-DP-2024-005.- Geneva : CERN, 2024 - 17 p. Fulltext: PDF;

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2024-01-24
18:03
XY-factorization correction for luminosity calibration using off-axis scans for 2022 pp data at 13.6 TeV /CMS Collaboration
This note describes the results of the XY-factorization analysis of the CMS 2022 proton-proton luminosity calibration at 13.6 TeV center-of-mass energy using on-axis Van-der-Meer and off-axis diagonal or offset scans..
CMS-DP-2024-004; CERN-CMS-DP-2024-004.- Geneva : CERN, 2023 - 22 p. Fulltext: PDF;

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2024-01-24
18:03
DeepCore 2.0: Convolutional Neural Network for Tracking in Jets with High Transverse Momentum /CMS Collaboration
Tracking of charged particles in dense environments, especially in the core of high transverse-momentum ($p_T$) jets, presents a growing challenge with increasing LHC luminosity. Despite the CMS phase-1 pixel detector upgrade, and dedicated cluster splitting and pattern recognition algorithms like JetCore, there is still significant room for improvement [...]
CMS-DP-2024-003; CERN-CMS-DP-2024-003.- Geneva : CERN, 2024 - 22 p. Fulltext: PDF;

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2024-01-22
11:45
L1 Trigger and ZDC Performance during 2023 Heavy Ion Run /CMS Collaboration
Ultraperipheral collisions (UPCs) of heavy ions are a useful probe to study nuclear parton distribution functions (nPDFs) and, in particular, to characterize nuclear matter at Bjorken $x < 10^{-3}$ and low squared momentum transfer $Q^2$ (shadowing/saturation regime). In order to fully exploit these collisions, dedicated triggers on such event topologies were developed for the PbPb data-taking period in 2023 by the CMS experiment. [...]
CMS-DP-2024-002; CERN-CMS-DP-2024-002.- Geneva : CERN, 2023 - 23 p. Fulltext: PDF;

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