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CERN Accelerating science

CMS Detector Performance Summaries

Posledne pridané:
2024-04-16
18:04
NNPuppiTaus: PUPPI tau reconstruction in the Level-1 trigger with real-time machine learning /CMS Collaboration
The future LHC High-Luminosity upgrade amplifies the proton collision rate by a factor of about 5-7, posing challenges for physics object reconstruction and identification including the tau leptons. Detecting taus at the CMS Level-1 (L1) trigger enables many important physics analyses in the experiment. [...]
CMS-DP-2024-018; CERN-CMS-DP-2024-018.- Geneva : CERN, 2024 - 14 p. Fulltext: PDF;

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2024-03-21
13:45
Efficiency of multijet triggers using b-tagging and electron+HT/jet triggers in 2022 and 2023 /CMS Collaboration
This note presents Level-1 Trigger + High-Level Trigger efficiencies for some of the dedicated trigger algorithms used for top-physics analyses in CMS. The triggers considered here include (a) hadronic triggers selecting events based on the scalar sum of jet transverse momenta, jet multiplicity and jet b-tagging discriminants (HT+multijet+Btag triggers), and (b) triggers selecting events with an electron produced in association with hadronic jets (electron+HT/jet triggers). [...]
CMS-DP-2024-016; CERN-CMS-DP-2024-016.- Geneva : CERN, 2024 - 14 p. Fulltext: PDF;

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2024-03-13
09:06
Data compression via partial online processing in CMS: experience in heavy ions and prospects /CMS Collaboration
As the LHC starts to deliver higher luminosities of proton-proton and heavy-ion collisions, the size of raw event data output begins to be a limiting factor in the number of events that can be recorded. Due to the large number of channels, the original silicon strip tracker (SST) data format, which stores the per-silicon-strip ADC counts, is the largest component of the CMS raw-data size. [...]
CMS-DP-2024-007; CERN-CMS-DP-2024-007.- Geneva : CERN, 2023 - 11 p. Fulltext: PDF;

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2024-03-11
11:19
Luminosity calibration of 2017 XeXe collisions at 5.44 TeV /CMS Collaboration
In this note, we present the luminosity calibration for the CMS experiment during the Xenon-Xenon collisions that occurred in the year 2017 at a nucleon-nucleon center-of-mass energy of 5.44 TeV and also the cross-luminometer consistency. This calibration is based on the analysis of data recorded by three sub-detectors: the Pixel Luminosity Telescope (PLT), the Fast Beam Conditions Monitor (BCM1F), and the forward hadron calorimeter (HFOC). The calibration constant (visible cross-section) is determined through the utilization of emittance scan (a vdM-like scan) data, where the sub-detectors' rates are measured as a function of beam separation [...]
CMS-DP-2024-015; CERN-CMS-DP-2024-015.- Geneva : CERN, 2024 - 7 p. Fulltext: PDF;

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2024-03-04
16:54
Performance of the Line Segment Tracking Algorithm in the CMS Phase-2 High Level Trigger Tracking /CMS Collaboration
This note presents the status of the Line Segment Tracking algorithm, incl. its physics performance and computational speed, in the context of the track reconstruction being developed for the CMS Phase-2 High-Level Trigger..
CMS-DP-2024-014; CERN-CMS-DP-2024-014.- Geneva : CERN, 2024 - 25 p. Fulltext: PDF;

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2024-03-04
16:54
Performance of Track Reconstruction at the CMS High-Level Trigger in 2023 data /CMS Collaboration
This note describes the physics performance of track reconstruction in the CMS High-Level Trigger in data collected in 2023, including comparisons to the performance measured in 2022..
CMS-DP-2024-013; CERN-CMS-DP-2024-013.- Geneva : CERN, 2024 - 20 p. Fulltext: PDF;

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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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