CERN Accelerating science

CMS Detector Performance Summaries

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2020-02-04
15:11
B-Jet Trigger Performance in Run 2 /CMS Collaboration
This study shows the performance of the online b-tagging run in 2017 (CSV) and 2018 (DeepCSV)..
CMS-DP-2019-042; CERN-CMS-DP-2019-042.- Geneva : CERN, 2019 - 23 p. Fulltext: PDF;

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2020-01-30
10:19
Identification of highly Lorentz-boosted heavy particles using graph neural networks and new mass decorrelation techniques /CMS Collaboration
This note presents several new developments on machine learning (ML)-based identification of highly Lorentz-boosted heavy particles using jet substructure in CMS and their performance with the CMS Phase 1 detector. A new algorithm based on ParticleNet, a graph neural network using an unordered set of jet constituent particles as the input, has been developed and shows significantly improved performance. [...]
CMS-DP-2020-002; CERN-CMS-DP-2020-002.- Geneva : CERN, 2020 - 13 p. Fulltext: PDF;

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2019-12-16
15:15
Recording and reconstructing 10 billion unbiased b hadron decays in CMS /CMS Collaboration
The CMS experiment has recorded a sample of 10 billion events containing the unbiased decays of b hadrons. The accumulation, processing, and validation of this data set were delivered without significant impact on the core physics programme of CMS. [...]
CMS-DP-2019-043; CERN-CMS-DP-2019-043.- Geneva : CERN, 2019 - 18 p. Fulltext: PDF;

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2019-11-27
10:26
DT hit efficiency measurements with reduced high voltage /CMS Collaboration
Efficiency measurements were carried out on the CMS Drift Tubes (DT) applying anode High Voltage lower than nominal. The "HV scans", performed periodically with cosmic rays, allowed to exclude detector ageing during Run 2, and also to assess the effect of lowering the Front End threshold. [...]
CMS-DP-2019-041; CERN-CMS-DP-2019-041.- Geneva : CERN, 2019 - 8 p. Fulltext: PDF;

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2019-11-12
15:19
ECAL 2018 refined calibration and Preshower Run 2 performance plots /CMS Collaboration
Many physics analyses using the Compact Muon Solenoid (CMS) detector at the LHC require accurate, high resolution electron and photon energy measurements. Following the excellent performance achieved in Run I at center-of-mass energies of 7 and 8 TeV, the CMS electromagnetic calorimeter (ECAL) is operating at the LHC with proton-proton collisions at 13 TeV center-of-mass energy. [...]
CMS-DP-2019-038; CERN-CMS-DP-2019-038.- Geneva : CERN, 2019 - 25 p. Fulltext: PDF;

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2019-11-12
15:19
Emittance scans comparison with LHC wire scanner /CMS Collaboration
High-luminosity production at the LHC is closely linked to the size of the transverse beam emittance. However emittance measurement is challenging. [...]
CMS-DP-2019-039; CERN-CMS-DP-2019-039.- Geneva : CERN, 2019 - 16 p. Fulltext: PDF;

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2019-11-12
15:19
Performance of a standalone simulation and potential improvements of the ECAL trigger primitive algorithms using LHC Run 2 data /CMS Collaboration
This note presents the performance of the ECAL trigger primitive algorithms in LHC Run 2, focusing on the reconstruction of signal amplitudes in the ECAL endcaps. Results are presented on the performance of the standalone simulation and on potential improvements in these algorithms that are being considered for LHC Run 3..
CMS-DP-2019-040; CERN-CMS-DP-2019-040.- Geneva : CERN, 2019 - 15 p. Fulltext: PDF;

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2019-10-30
14:04
The MIP Timing Detector /CMS Collaboration
These slides contain approved figures on the MIP Timing Detector design and performance..
CMS-DP-2019-037; CERN-CMS-DP-2019-037.- Geneva : CERN, 2019 - 51 p. Fulltext: PDF;

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2019-10-30
14:03
Efficiency of the Pixel sensors used in the Precision Proton Spectrometer: radiation damage /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 2017 (2018) two (four) RPs were equipped with with 3D pixel sensors, which by the end of Run-II collected $\sim$100/fb. This note describes the method used to evaluate the effect of the non-uniform irradiation on the readout chip, and its consequences on the efficiency..
CMS-DP-2019-036; CERN-CMS-DP-2019-036.- Geneva : CERN, 2019 - 17 p. Fulltext: PDF;

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2019-10-24
17:17
Time resolution of the diamond sensors used in the Precision Proton Spectrometer /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, timing detectors were installed in 2017 to measure the Time-Of-Flight (TOF) of the protons produced in central exclusive interactions. [...]
CMS-DP-2019-034; CERN-CMS-DP-2019-034.- Geneva : CERN, 2019 - 15 p. Fulltext: PDF;

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