2020-06-30
11:42 |
MIP Timing Detector : Erratum of CMS DP-2019/037
/CMS Collaboration
This DPS corrects a few editorial mistakes of page 5 of CMS DP-2019/037 and aligns the numbers with the MTD TDR as it was intended
CMS-DP-2020-030; CERN-CMS-DP-2020-030.-
Geneva : CERN, 2020 - 3 p.
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2020-06-23
14:54 |
Performance of Same Sign Dimuon Trigger with 2016 pp Collision Data
/CMS Collaboration
A same-sign double muon trigger was developed and implemented in LHC Run-2 to search for light pseudoscalar boson pairs produced in the decay of the 125 GeV Higgs boson and resulting in final states with four tau leptons. Each pseudoscalar boson is required to decay into a muon and a charged particle which could either be an electron or a muon or a charged hadron from tau decay, with at least two identified muons in the event which are required to have the same charge sign. [...]
CMS-DP-2020-029; CERN-CMS-DP-2020-029.-
Geneva : CERN, 2020 - 17 p.
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2020-06-11
09:37 |
Pixel Charge Profiles in Run-2 Data and Simulation
/CMS Collaboration
The pixel charge profile (normalised average pixel charge as a function of the production depth) is sensitive to the irradiation of the silicon substrate. For a non irradiated fully depleted pixel detector, the charge profile is expected to be flat. [...]
CMS-DP-2020-026; CERN-CMS-DP-2020-026.-
Geneva : CERN, 2020 - 7 p.
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2020-05-26
09:35 |
W and top tagging scale factors for Run 2 data
/CMS Collaboration
This note presents the data-to-simulation scale factors used in the identification of hadronically decaying top quarks and W bosons using the full Run 2 dataset, recorded in the years 2016, 2017 and 2018, with the CMS detector corresponding to a total
integrated luminosity of $137\;\text{fb}^{-1}$. Relevant kinematic distributions for the 2018 data taking period, corresponding to an integrated luminosity of $60\;\text{fb}^{-1}$, are also presented..
CMS-DP-2020-025; CERN-CMS-DP-2020-025.-
Geneva : CERN, 2020 - 30 p.
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2020-05-25
09:55 |
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2020-05-13
10:17 |
CMS Tracker Alignment Parameter Errors performance results for full Run 2 Legacy reprocessing
/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). This note collects performance results of the tracker detector alignment parameter errors obtained using the updated Legacy software and calibration for the data collected by CMS during the three years period 2016,2017 and 2018, and corresponding to an integrated luminosity of about 140/fb. [...]
CMS-DP-2020-023; CERN-CMS-DP-2020-023.-
Geneva : CERN, 2020 - 10 p.
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2020-05-13
10:17 |
Background studies in the CMS DT chambers during LHC Run 2
/CMS Collaboration
Characterising background in terms of trends vs LHC instantaneous luminosity and of spatial distributions, helps to understand its sources and to devise mitigation measures to prevent detector early ageing, especially in view of the Luminosity increase expected at High Luminosity LHC.
During LHC Run2, the background in the CMS Drift Tubes (DT) was monitored by means of both online anode current measurements and offline analysis.
For the offline analysis a method was developed to classify background and signal objects, where objects are either single hits or reconstructed track segments.
Both rates and currents were observed to depend linearly on LHC instantaneous luminosity: the slopes of these trends were used as a measure of background, depending only on the chamber position.
A Zero Bias data sample was used to measure both background and signal rates, however the same method can also be applied to derive conservative background estimates using samples muon enriched skimmed events.
The observed spatial distribution of background supports the hypothesis of two different components: one coming directly from the interaction point, the other coming from outside the detector, through a so called neutron gas setting up in the cavern..
CMS-DP-2020-022; CERN-CMS-DP-2020-022.-
Geneva : CERN, 2020 - 35 p.
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2020-05-13
10:17 |
ECAL 2016 refined calibration and Run2 summary 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-2020-021; CERN-CMS-DP-2020-021.-
Geneva : CERN, 2020
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2020-04-23
23:38 |
Performance of the pile up jet identification in CMS for Run 2
/CMS Collaboration
The excellent operation of the LHC during the Run 2 data taking (2015-2018) has allowed the machine to reach a peak instantaneous luminosity delivered to ATLAS and CMS as high as $2\times10^{34}~\mathrm{Hz~cm^{-2}}$, leading to a large number of proton-proton inelastic scatterings to occur during the same bunch crossing (``pile up''). For the 2017 and 2018 datasets, this results in an average pile up of 32. [...]
CMS-DP-2020-020; CERN-CMS-DP-2020-020.-
Geneva : CERN, 2020 - 11 p.
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2020-04-23
17:03 |
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