CERN Accelerating science

CMS Conference Reports

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2019-02-13
17:04
Characterization of the MPA prototype, a 65 nm pixel readout ASIC with on-chip quick transverse momentum discrimination capabilities / Ceresa, Davide (CERN) ; Caratelli, Alessandro (CERN) ; De Clercq, Jarne Theo (Vrije U., Brussels) ; Dena Giovinazzo ; Haranko, Mykyta (DESY) ; Jan Kaplon ; Kloukinas, Konstantinos (CERN) ; Jan Murdzek ; Scarfi', Simone (CERN)
The first prototype of the full-size, full-functionality Macro Pixel ASIC has been produced in a 65~nm technology employing radiation tolerant techniques. It is a pixel readout ASIC designed for the Phase-2 upgrade of the CMS Outer Tracker detector. [...]
CMS-CR-2018-279.- Geneva : CERN, 2018 - 6 p. Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics, Antwerp, Belgique, 17 - 21 Sep 2018

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2019-02-13
17:01
Reliability test results of the interconnect structures of the front-end hybrids for the CMS Phase-2 Tracker Upgrade / Kovacs, Mark Istvan (CERN) ; Bruno Allongue ; Florian Andre ; Blanchot, Georges (CERN) ; Gadek, Tomasz (CERN) ; Gajanec, Rafael (CERN)
High Density Interconnect (HDI) hybrids are being developed for the CMS Tracker Phase Two Upgrade for the HL-LHC. These hybrids are carbon fibre reinforced flexible circuits with flip-chips, passives and connectors. [...]
CMS-CR-2018-292.- Geneva : CERN, 2018 - 6 p. Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics, Antwerp, Belgique, 17 - 21 Sep 2018

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2019-02-13
17:00
Front-end hybrids for the strip-strip modules of the CMS Outer Tracker Upgrade / Gadek, Tomasz (CERN) ; Blanchot, Georges (CERN) ; Gajanec, Rafael (CERN) ; Honma, Alan (Brown U.) ; Kovacs, Mark Istvan (CERN)
The CMS Outer Tracker planned for the HL-LHC Upgrade contains strip-strip and pixel-strip silicon modules. Each of them includes two high-density front-end hybrid circuits, equipped with flip-chip ASICs, passives, connectors and mechanical structures. [...]
CMS-CR-2018-295.- Geneva : CERN, 2018 - 6 p. Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics, Antwerp, Belgique, 17 - 21 Sep 2018

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2019-02-06
10:53
SUSY at CMS / Kazana, Malgorzata (NCBJ, Swierk) /CMS Collaboration
The CMS experiment at the LHC has published results derived from a dataset of an integrated luminosity $\mathcal{L}$~$=$~$35.9$\,fb$^{-1}$ recorded with proton-proton collisions at centre-of-mass energy 13 TeV in 2016. In this overview, the selected CMS results of searches for supersymmetry are presented as available in the summer of 2018..
CMS-CR-2018-231.- Geneva : CERN, 2018 - 9 p. Fulltext: PDF;
In : 21th High-Energy Physics International Conference in Quantum Chromodynamics, Montpellier, France, 2 - 6 Jul 2018

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2019-02-06
10:52
Constraints on nuclear parton distribution functions with dijets in pp, pPb collisions at $\sqrt s$~=~5.02~TeV with the CMS detector / Go, Yeonju (Korea U.) /CMS Collaboration
Dijet measurements in pPb collisions have been shown to be one of the most important tools for constraining the gluon nuclear parton distribution functions (nPDFs) at large Bjorken x. The dijet pseudorapidity distributions are measured as a function of dijet average transverse momentum in order to study the nuclear modifications of PDFs at various factorization scales. [...]
CMS-CR-2018-425.- Geneva : CERN, 2018 - 6 p. Fulltext: PDF;
In : Hard Probes 2018: International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Aix-les-bains, France, 1 - 5 Oct 2018

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2019-02-06
10:52
The CMS Tracker Upgrade for the High Luminosity LHC / Sguazzoni, Giacomo (INFN, Florence)
The LHC machine is planning an upgrade program which will smoothly bring the luminosity to about $5-7.5\times10^{34}$cm$^{-2}$s$^{-1}$ in 2028, to possibly reach an integrated luminosity of $3000-4500\;$fb$^{-1}$ by the end of 2039. This High Luminosity LHC scenario, HL-LHC, will require an upgrade program of the LHC detectors known as Phase-2 upgrade. [...]
CMS-CR-2018-422.- Geneva : CERN, 2018 - 7 p. Fulltext: PDF;
In : 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2018), Sydney, Australia, 10 - 17 Nov 2018

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2019-01-22
08:33
Understanding sequential quarkonium suppression with $\Upsilon(nS)$ measurements in pp and PbPb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV / Park, Jaebeom (Korea U.) /CMS Collaboration
The production cross sections of the $\Upsilon(1S)$, $\Upsilon(2S)$, and $\Upsilon(3S)$ states were measured separately using the CMS experimental apparatus, in proton-proton (pp) and lead-lead (PbPb) collisions at 5.02 TeV. The final results of the nuclear modification factors, $R_{AA}$, are reported of the three upsilon states as a function of transverse momentum ($p_{T}$), rapidity ($y$) and PbPb collision centrality. The data show a significant suppression of all three states following a sequential ordering, $R_{AA}(\Upsilon(1S)) > R_{AA}(\Upsilon(2S)) > R_{AA}(\Upsilon(3S))$. [...]
CMS-CR-2018-418.- Geneva : CERN, 2018 - 6 p. Fulltext: PDF;
In : Hard Probes 2018: International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Aix-les-bains, France, 1 - 5 Oct 2018

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2019-01-18
15:37
Measurement of exclusive Upsilon photoproduction in pPb collisions with the CMS experiment / Naskar, Kousik (Bhabha Atomic Res. Ctr.) /CMS Collaboration
The aim of this study is to measure exclusive photoproduction of three resonant particles, $\bf \Upsilon(1S)$, $\bf \Upsilon(2S)$ and $\bf \Upsilon(3S)$ mesons,in their $\mu^{+}\mu^{-}$ decay modes, in ultraperipheral pPb collisions.The $\bf \Upsilon(1S)$ photoproduction cross section are measured, over the rapidity range $\vert y \vert < 2.2$, as a function of the photon-proton center-of-mass energy, $W_{\gamma p}$, which provides valuable information of the gluon distribution at small values of parton fractional momenta $x$. The slope of the squared transverse momentum ($p_{T}^2$) dependent differential cross section is measured to determine the size of the production region. [...]
CMS-CR-2018-411.- Geneva : CERN, 2018 - 6 p. Fulltext: PDF;
In : Hard Probes 2018: International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Aix-les-bains, France, 1 - 5 Oct 2018

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2019-01-16
10:10
nPDF studies with electroweak bosons in pPb collisions at $\sqrt{s_{NN}}$ = 8.16 TeV with the CMS experiment / Kim, Hyunchul (Chonnam Natl. U.) /CMS Collaboration
Yields of electroweak gauge bosons can be used to probe the nuclear parton distribution functions of quarks and antiquarks. Final results on W boson production in pPb collisions at a nucleon-nucleon center-of-mass energy of 8.16 TeV using the CMS detector will be presented. [...]
CMS-CR-2019-002.- Geneva : CERN, 2019 - 6 p. Fulltext: PDF;
In : Hard Probes 2018: International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Aix-les-bains, France, 1 - 5 Oct 2018

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2019-01-16
10:10
Detailed studies of prompt J/$\psi$ and $\psi(2S)$ production in pp, pPb and PbPb collisions at $\sqrt s$~=~5.02 TeV with the CMS experiment / Diab, Batoul (Ecole Polytechnique) /CMS Collaboration
The understanding of charmonium production in PbPb collisions requires the inclusion of many phenomena such as dissociation in the QGP, partonic energy loss, statistical recombination, on top of cold nuclear matter effects (modifications of nPDFs, initial-state energy loss, nuclear break-up). Final results on prompt J/$\psi$ and $\psi(\mathrm{2S})$ production, based on the pp and PbPb data collected at 5.02 TeV by CMS in 2015, are reported, showing a stronger suppression of the excited state as compared to the ground state in all measured bins of ${p_{\mathrm{T}}}$ and centrality, as well as a hint for a weaker J/$\psi$ suppression at low ${p_{\mathrm{T}}}$ (possibly due to regeneration) and at high ${p_{\mathrm{T}}}$ (possibly due to partonic energy loss). [...]
CMS-CR-2018-420.- Geneva : CERN, 2018 - 6 p. Fulltext: PDF;
In : Hard Probes 2018: International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, Aix-les-bains, France, 1 - 5 Oct 2018

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