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CMS Detector Performance Summaries

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2019-09-27
16:37
CMS ECAL trigger plots /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 barrel and endcaps, and the rejection of anomalous signals in the ECAL barrel photodetectors. Results are also presented on potential improvements in these algorithms that are being considered for LHC Run 3..
CMS-DP-2019-031; CERN-CMS-DP-2019-031.- Geneva : CERN, 2019 - 43 p. Fulltext: PDF;

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2019-09-27
16:37
CMS ECAL Laser Monitoring System /CMS Collaboration
The plots show the behavior of the ECAL laser monitoring system in 2018, in particular measurements of the stability of the laser amplitude inside the detector, measured by PiN and PN diodes through optical fibers, and residual energy-scale corrections obtained with electron track-to-momentum ratio in collision events
CMS-DP-2019-030; CERN-CMS-DP-2019-030.- Geneva : CERN, 2019 - 8 p. Fulltext: PDF;

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2019-09-27
16:37
CMS ECAL performance with 2017 data /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-2019-029; CERN-CMS-DP-2019-029.- Geneva : CERN, 2019 - 20 p. Fulltext: PDF;

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2019-09-26
16:19
Measurements of the HLT performance of displaced muons using Cosmics data /CMS Collaboration
This note presents the performance of a dedicated displaced standalone muon reconstruction at the High Level Trigger in cosmics data recorded with the CMS detector in 2016. The results are presented as a function of the impact parameter of the offline reconstructed muon. [...]
CMS-DP-2019-028; CERN-CMS-DP-2019-028.- Geneva : CERN, 2019 - 12 p. Fulltext: PDF;

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2019-09-17
16:20
Tracker Performance in 2017 Legacy processing /CMS Collaboration
During the LHC Long Shutdown 2, the CMS experiment started a collaboration-wide effort to re-calibrate the data and optimize the simulation, reconstruction and analysis software in order to reprocess the data collected during LHC Run 2 with uniform software and detector calibrations (Legacy processing). In this note are collected selected performance results obtained using the updated Legacy software and calibration concerning the pixel tracker simulation and the tracker detector alignment for the data collected by CMS during the year 2017, compared with the corresponding results at the time of the end of 2017 data-taking..
CMS-DP-2019-027; CERN-CMS-DP-2019-027.- Geneva : CERN, 2019 - 13 p. Fulltext: PDF;

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2019-08-20
13:34
Performance of top triggers in Run 2 /CMS Collaboration
The performance of the triggers used in top physics during the Run 2 is summarized. The document reviews the performance of electron and jets cross-triggers and fully hadronic triggers in the 2016 and 2017 data-taking..
CMS-DP-2019-026; CERN-CMS-DP-2019-026.- Geneva : CERN, 2019 - 13 p. Fulltext: PDF;

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2019-08-20
13:34
Run II Trigger Performance For $e\mu$ Triggers /CMS Collaboration
This note reports the trigger efficiencies for the $e\mu$ cross triggers for the entire Run II. The efficiencies for 2016, 2017 and 2018 are compared..
CMS-DP-2019-025; CERN-CMS-DP-2019-025.- Geneva : CERN, 2019 - 44 p. Fulltext: PDF;

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2019-07-26
08:20
Auxiliary material for the 2018 luminosity measurement /CMS Collaboration
To use the calibration obtained from a van der Meer scan under physics data-taking conditions with more bunches and significantly higher instantaneous luminosity, an additional measurement of the stability and nonlinearity of the luminosity detectors is required. Potential nonlinear effects are important especially during Run 2 (2015-2018), where pileup during physics data taking reached up to about 50. [...]
CMS-DP-2019-024; CERN-CMS-DP-2019-024.- Geneva : CERN, 2019 - 4 p. Fulltext: PDF;

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2019-07-16
10:02
Simulation studies of the impact of the CMS radiation environment on RPC detectors /CMS Collaboration
The High-Luminosity Large Hadron Collider (HL-LHC) upgrade aims to increase its luminosity by a factor of 5 beyond the LHC's design value and the integrated luminosity by a factor of 10, increasing the potential for discoveries after 2025. The increased collision rate of particles will be a challenge for the CMS systems as higher levels of radiation could degrade them and affect their performance. [...]
CMS-DP-2019-023; CERN-CMS-DP-2019-023.- Geneva : CERN, 2019 - 9 p. Fulltext: PDF;

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2019-07-16
10:02
Muon reconstruction performance during Run II /CMS Collaboration
Efficiency of muon reconstruction and energy resolution are shown in pp collisions at $\sqrt{s}$ = 13 TeV recorded by the CMS detector in 2018. Energy scale measurements for high energy muons are also shown in the dataset collected during 2017..
CMS-DP-2019-022; CERN-CMS-DP-2019-022.- Geneva : CERN, 2019 - 12 p. Fulltext: PDF;

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