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CMS Conference Reports

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2020-03-25
12:31
Measurements of $\mathrm{t}\bar{\mathrm{t}}$+jets, $\mathrm{t}\bar{\mathrm{t}}\mathrm{b}\bar{\mathrm{b}}$ and $\mathrm{t}\bar{\mathrm{t}}\mathrm{t}\bar{\mathrm{t}}$ production with CMS / Wertz, Sebastien (Zurich U.) /CMS Collaboration
Recent inclusive and differential cross section measurements of top quark pair production in association with jets and b jets are presented. The measurements are confronted with several theoretical predictions. [...]
CMS-CR-2019-158.- Geneva : CERN, 2019 - 8 p. Fulltext: PDF;
In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019

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2020-03-25
12:25
Analog front-end characterization of the RD53A chip / Emriskova, Natalia (CERN) /CMS Collaboration
For the Phase-2 upgrade of ATLAS and CMS tracking detectors, a new pixel readout chip, with a 50\,$\mu$m $\times$ 50\,$\mu$m pixel size, is being designed in 65 nm CMOS technology by the RD53 collaboration. A large-scale demonstrator chip called RD53A, containing design variations in the pixel matrix, among which are three different analog front-ends, is now available. [...]
CMS-CR-2019-202.- Geneva : CERN, 2019 - 6 p. Fulltext: PDF;
In : TWEPP 2019 Topical Workshop on Electronics for Particle Physics, Santiago De Compostela, Spain, 2 - 6 Sep 2019

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2020-03-25
12:25
GEM detectors for the Upgrade of the CMS Muon Forward system / Ressegotti, Martina (INFN, Pavia ; Pavia U.) /CMS Collaboration
The CMS experiment is one of the two general purpose experiments at the LHC. For LHC Phase-2, the instantaneous luminosity delivered to the experiment will reach 5 $\times$ 10$^{34}$ cm$^{-2}$ s$^{-1}$, resulting in high particle fluxes that require the detectors to be upgraded. [...]
CMS-CR-2019-266.- Geneva : CERN, 2019 - 6 p. Fulltext: PDF;
In : 27th International Symposium on Nuclear Electronics & Computing, Becici, Budva, Montenegro, 30 Sep - 4 Oct 2019

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2020-03-25
12:25
Identification of tau leptons using Deep Learning techniques at CMS / Androsov, Konstantin (INFN, Pisa) /CMS Collaboration
The reconstruction and identification of tau leptons decaying into hadrons are crucial for analyses with tau leptons in the final state. To discriminate hadronic tau decays from the three main backgrounds (quark or gluon induced jets, electrons, and muons), with a low rate of misidentification and with high efficiency on the signal at the same time, the information of multiple CMS sub-detectors is combined. [...]
CMS-CR-2019-272.- Geneva : CERN, 2019 - 6 p. Fulltext: PDF;
In : 27th International Symposium on Nuclear Electronics & Computing, Becici, Budva, Montenegro, 30 Sep - 4 Oct 2019

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2020-03-25
12:23
The CMS Outer Tracker for the High Luminosity LHC upgrade / La Rosa, Alessandro (CERN) /CMS Collaboration
The High Luminosity Large Hadron Collider (HL-LHC) at CERN is expected to collide protons at a centre-of-mass energy of 14\,TeV and to reach the unprecedented peak instantaneous luminosity of 5\,$-$\,7.5\,x\,$10^{34}$\,cm$^{-2}$s$^{-1}$ with an average number of pileup events of 140\,$-$\,200. This will allow the ATLAS and CMS experiments to collect integrated luminosities up to 3000\,$-$\,4000\,fb$^{-1}$ during the project lifetime. [...]
CMS-CR-2019-276.- Geneva : CERN, 2019 - 11 p. Fulltext: PDF;
In : 15th Topical Seminar on Innovative Particle and Radiation Detectors, Siena, Italy, 14 - 17 Oct 2019

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2020-03-25
12:19
DAQ and Level-1 Track Finding for the CMS HL-LHC Upgrade / Ravera, Fabio (Fermilab) /CMS Collaboration
The LHC will be upgraded to the High Luminosity LHC (HL-LHC) in the late 2020s in order to reach an instantaneous luminosity as high as $7 \times 10^{34}$~cm$^{-2}$s$^{-1}$, hence increasing the discovery potential of the machine. In order to preserve physics object performance in spite of large pile-up, the CMS detector will be significantly upgraded. A key component of the upgrade is the Outer Tracker detector that will be able to identify tracks with transverse momentum above $\sim2$~GeV/c and provide them to the Track Finder boards, thus maintaining manageable trigger rates and good performance. One of the main challenges of the Level-1 track finding is being able to reconstruct charged particles trajectories from a $40$~MHz collision rate with a few microsecond latency budget. Dedicated FPGA hardware systems have been developed for track finding to address this challenge. [...]
CMS-CR-2019-282.- Geneva : CERN, 2019 - 10 p. Fulltext: PDF;
In : Vertex 2019: 28th International Workshop on Vertex Detectors, Lopud Island, Croatia, 13 - 18 Oct 2019

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2020-03-25
12:14
Beam Test Measurements on Planar Pixel Sensors for the CMS Phase 2 Upgrade / Feindt, Finn (Hamburg U.)
The requirements for the CMS Inner Tracker for the high luminosity upgrade of the Large Hadron Collider (LHC) are driven by the high expected instantaneous luminosity of up to $7.5\times10^{34}$\,cm$^{-2}$s$^{-1}$. The detector will have to withstand a 1\,MeV neutron equivalent fluence of up to $2\times10^{16}$\,cm$^{-2}$ at 2.8\,cm distance from the beam. [...]
CMS-CR-2019-298.- Geneva : CERN, 2019 - 8 p. Fulltext: PDF;
In : 2019 IEEE Nuclear Science Symposium (NSS) and Medical Imaging Conference (MIC), Manchester, United Kingdom, 26 Oct - 2 Nov 2019

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2020-03-06
10:52
CMS Phase-1 Pixel Detector: Operational Experience, Performance and Lessons Learned / Modak, Atanu (Kansas State U.) /CMS Collaboration
The CMS Phase-1 pixel detector was designed to cope with an instantaneous luminosity of $2\times$10$^{34}$ cm$^{-2}$s$^{-1}$ at 25\,ns bunch spacing with very small efficiency loss. The Phase-1 pixel detector features four barrel layers and three disks per side, with in total 124 Million pixels, while the original CMS pixel detector had one layer and disk less in the barrel and endcap respectively, and only half the number of channels. [...]
CMS-CR-2019-283.- Geneva : CERN, 2019 - 10 p. Fulltext: PDF;
In : Vertex 2019: 28th International Workshop on Vertex Detectors, Lopud Island, Croatia, 13 - 18 Oct 2019

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2020-03-06
10:51
The CMS Precision Proton Spectrometer timing system performance in Run 2, future upgrades and sensor radiation hardness studies. / Bossini, Edoardo (CERN) /CMS and TOTEM Collaborations
Central exclusive processes can be studied in CMS by combining the information of the central detector with the Precision Proton Spectrometer (PPS). PPS detectors, placed symmetrically at more than 200 m from the interaction point, can detect the scattered protons that survive the interaction. [...]
CMS-CR-2019-294.- Geneva : CERN, 2019 - 13 p. Fulltext: PDF;
In : 15th Topical Seminar on Innovative Particle and Radiation Detectors, Siena, Italy, 14 - 17 Oct 2019

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2020-03-06
10:50
CMS results on heavy ion physics / Petrushanko, Sergey (Moscow State U.) /CMS Collaboration
We present a summary of recent heavy ion results with the CMS detector at the LHC, including several topics of interest to the study of quark matter..
CMS-CR-2019-297.- Geneva : CERN, 2019 - 5 p. Fulltext: PDF;
In : Nineteenth Lomonosov Conference on Elementary Particle Physics, Moscow, Russia, 22 - 28 Aug 2019

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