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CMS Conference Reports

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2020-06-11
09:47
Prototype module construction for the high luminosity upgrade of the CMS pixel detector / Ristic, Branislav (Zurich, ETH) /CMS Collaboration
With the planned upgrades of the LHC towards high luminosity operation, the entire CMS silicon tracker will be replaced in order to cope with the resulting elevated pileup and radiation levels. To fulfill these requirements for the CMS pixel detector, a new readout chip was developed by the RD53 collaboration in 65\,nm CMOS technology, featuring a higher readout bandwidth along with increased granularity and radiation tolerance. [...]
CMS-CR-2019-303.- Geneva : CERN, 2019 - 8 p. Fulltext: PDF;
In : Vertex 2019: 28th International Workshop on Vertex Detectors, Lopud Island, Croatia, 13 - 18 Oct 2019

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2020-06-11
09:47
MPA-SSA, design and test of a 65 nm ASIC-based system for particle tracking at HL-LHC featuring on-chip particle discrimination / Ceresa, Davide (CERN) ; Bergamin, Gianmario (CERN) ; Caratelli, Alessandro (CERN) ; Jan Kaplon ; Kloukinas, Konstantinos (CERN) ; Scarfi', Simone (CERN) ; Yusuf Leblebici
Particle tracking detectors for High Energy Physics need a new readout technique to cope with the increase of the collision rate foreseen for the High Luminosity LHC upgrade. In particular, the selection of interesting physics events at the first trigger stage becomes extremely challenging at high luminosity, not only because of the rate increase, but also because the selection algorithms become inefficient in high pileup conditions. [...]
CMS-CR-2019-302.- Geneva : CERN, 2019 - 4 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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2020-06-11
09:47
Characteristics and Performance of RD53A Readout Chip Equipped with Small-pixel Silicon Sensors / Ebrahimi, Aliakbar (Hamburg U.)
The luminosity of the Large Hadron Collider (LHC) at CERN will be upgraded by a factor of seven to 7.5 $\times$ 10$^{\text{34}}$ cm${^\text{-2}}$s$^{\text{-1}}$, hence boosting the physics potential of its experiments. The increased luminosity leads to a higher rate of proton-proton interactions, in the order of 200 events per bunch crossing and a larger dose and fluence. The CMS experiment will upgrade many of its sub-detectors in order to cope with the new experimental conditions. [...]
CMS-CR-2019-299.- Geneva : CERN, 2019 - 6 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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2020-04-20
15:31
Powering of the CMS Phase-2 Upgraded Tracker / Cassese, Antonio (INFN, Florence) /CMS Collaboration
The LHC machine will be upgraded to increase its peak luminosity and targeting an integrated luminosity of $3000 \div 4500\;$fb$^{-1}$ in 10 years. The CMS experiment will be upgraded to meet new challenges such as unprecedented radiation environment, demanding high resilience, and increased number of events per bunch crossing, requiring higher detector granularity. Consequently, both the Outer Tracker (OT) and Inner Tracker (IT) will have to fulfill very stringent requirements also in the power distribution to the front-end electronics: the OT (more than $13000$ independent modules) will use in situ DC/DC converters to parallel distribute $100\,kW$ of power, while the IT will use a serial powering scheme to provide about $50\,kW$ to thousands of modular units..
CMS-CR-2019-193.- 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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2020-04-20
15:31
Prototyping of Hybrid Circuits for the CMS Phase-2 Outer Tracker Upgrade at the HL-LHC / Blanchot, Georges (CERN) ; Gadek, Tomasz (Zurich, ETH) ; Honma, Alan (Brown U.) ; Kovacs, Mark Istvan (CERN) ; Rasevic, Nikola (VINCA Inst. Nucl. Sci., Belgrade) ; La Rosa, Alessandro (CERN) ; Zografos, Angelos (Natl. Tech. U., Athens)
High Density Interconnect hybrids are being developed for the CMS tracker Phase-2 upgrade for the HL-LHC. These hybrids are flexible circuits laminated to carbon fiber composite stiffeners and are assembled with flip-chips, passives and connectors. [...]
CMS-CR-2019-213.- Geneva : CERN, 2019 - 7 p. - Published in : PoS TWEPP2019 (2020) 060 Fulltext: PDF; Fulltext from publisher: PDF;
In : TWEPP 2019 Topical Workshop on Electronics for Particle Physics, Santiago De Compostela, Spain, 2 - 6 Sep 2019, pp.060

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2020-04-20
15:30
Measurement of associated Higgs boson production with a top-quark-antiquark pair in the \ensuremath{\text{H}\to \text{b}\overline{\text{b}}}~decay channel at CMS / Wassmer, Michael (KIT, Karlsruhe, EKP) /CMS Collaboration
The measurement of Higgs boson production in association with a top-quark-antiquark pair (\ensuremath{\text{t}\overline{\text{t}}\text{H}}) offers a direct tree-level probe of the coupling of the Higgs boson to top quarks. In the Standard Model, this coupling is expected to be of order unity, and it is therefore of special interest. [...]
CMS-CR-2019-128.- Geneva : CERN, 2019 - 5 p. Fulltext: PDF;
In : 31st Recontres de Blois (Particle Physics and Cosmology), Blois, France, 2 - 7 Jun 2019

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2020-04-20
15:29
The factorization bias in the Van der Meer method: Run 2 experiences at the CMS experiment / Knolle, Joscha (DESY) /CMS Collaboration
The luminosity measurement of the CMS experiment at the CERN LHC is calibrated with Van der Meer (VdM) scans. A bias occurs in the VdM method due to the assumption of transversely factorizable proton densities of the LHC beams. [...]
CMS-CR-2019-129.- Geneva : CERN, 2019 - 6 p. Fulltext: PDF;
In : LHC Lumi Days 2019, Cern, Switzerland, 4 - 5 Jun 2019

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2020-04-20
15:29
Commissioning and simulation of CHROMIE, a high-rate test beam telescope / Asenov, Patrick Asenov (Democritos Nucl. Res. Ctr.) /CMS Collaboration
The upgrade of the LHC to the High-Luminosity LHC (HL-LHC) is expected to increase the current instantaneous luminosity by a factor of 5 to 7, providing the opportunity to study rare processes and measure precisely the standard model parameters. To cope with the increase in pile-up (up to 200), particle density and radiation, CMS will build new silicon tracking devices with higher granularity (to reduce occupancy) and improved radiation hardness. [...]
CMS-CR-2019-131.- Geneva : CERN, 2019 - 10 p. Fulltext: PDF;
In : 21st International Workshop on Radiation Imaging Detectors, Kolympari, Chania, Greece, 7 - 12 Jul 2019

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2020-04-20
15:27
CMS Inner Tracker Upgrade / Luukka, Panja (Lappeenranta U. Tech.)
The LHC is preparing an upgrade, which will bring the luminosity of the machine to 5-7 $\times$ $10^{34}$~$\mathrm{ cm^{\text{-}2}s^{\text{-}1} }$ reaching an integrated luminosity of 3000 $\mathrm{ fb^{\text{-}1} }$ by the end of 2037. This High Luminosity LHC (HL-LHC) scenario will require extensive upgrades to the experiments to fully exploit the physics potential of the accelerator. [...]
CMS-CR-2020-008.- Geneva : CERN, 2020 - 10 p. Fulltext: PDF;
In : Vertex 2019: 28th International Workshop on Vertex Detectors, Lopud Island, Croatia, 13 - 18 Oct 2019

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2020-04-20
15:27
Bringing heterogeneity to the CMS software framework / Gutsche, Oliver (Fermilab) /CMS Collaboration
The advent of computing resources with co-processors, for example Graphics Processing Units (GPU) or Field-Programmable Gate Arrays (FPGA), for use cases like the CMS High-Level Trigger (HLT) or data processing at leadership-class supercomputers imposes challenges for the current data processing frameworks. These challenges include developing a model for algorithms to offload their computations on the co-processors as well as keeping the traditional CPU busy doing other work. [...]
CMS-CR-2020-033.- Geneva : CERN, 2020 - 8 p. Fulltext: PDF;
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019

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