CERN Accelerating science

CMS Conference Reports

Ostatnio dodane:
2023-02-08
11:37
Observation of vector boson scattering W+W- pair production in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector / Bulla, Andrea Claudio (INFN, Padua) /CMS Collaboration
The observation of vector boson scattering (VBS) W$^{+}$W$^{-}$ pair production, with the two W bosons decaying leptonically, has been reported by the CMS Collaboration at the CERN LHC.The data sample analyzed corresponds to an integrated luminosity of 138~fb$^{-1}$ of proton-proton collisions at $\sqrt{s}=13$~TeV collected by the CMS detector. Events are selected by requiring exactly two opposite-sign leptons (electrons or muons) and two jets with large pseudorapidity separation and high dijet invariant mass.Machine learning techniques are employed to deal with the irreducible background from the QCD-induced production of W bosons and the large background from the production of top quarks pair.The VBS W$^{+}$W$^{-}$ signal is observed with a significance of 5.6 standard deviations (5.2 expected) with respect to the background-only hypothesis. [...]
CMS-CR-2023-015.- Geneva : CERN, 2023 - 5 p. Fulltext: PDF;
In : 108th Congresso Nazionale della Societa Italiana di Fisica (SIF 2022), Milan, Italy, 12 - 16 Sep 2022

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2023-02-06
16:00
Search for new resonances in photon and jet final states using CMS data / Babbar, Jyoti (Panjab U.) /CMS Collaboration
Searching for new resonances is one of the ways at the Large Hadron Collider to look for new physics beyond the standard model (BSM), put forward by many theoretical models. Such BSM models predict for instance the existence of substructure of quarks and the quantum black holes, with their signature manifesting in different final states in proton-proton collisions at the LHC. [...]
CMS-CR-2023-004.- Geneva : CERN, 2023 - 8 p. Fulltext: PDF;
In : 8th Symposium on Prospects in the Physics of Discrete Symmetries, Baden-baden, Germany, 7 - 11 Nov 2022

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2023-02-06
15:56
Tracker alignment in CMS: interplay with pixel local reconstruction / Ventura Barroso, Ana (DESY) /CMS Collaboration
The CMS silicon tracking system measures the trajectories of charged particles with a hit resolution of the order of microns in the pixel detector and tens of microns in the strip detector. One of the most important inputs for track reconstruction is the precision with which the tracker geometry is known. [...]
CMS-CR-2023-011.- Geneva : CERN, 2023 - 9 p. Fulltext: PDF;
In : International Workshop on Semiconductor Pixel Detectors for Tracking and Imaging, Santa Fe, Us, 11 - 16 Dec 2022

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2023-02-06
15:54
Higher-order moments of the elliptic flow distribution in lead-lead collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$~TeV / Milosevic, Jovan (VINCA Inst. Nucl. Sci., B) /CMS Collaboration
The collective anisotropic hydrodynamic behavior of charge hadrons is studied using the multiparticle correlation method. The elliptic anisotropy harmonic from different orders of multiparticle cumulants, $v_{2}\{2k\}$, are measured up to the tenth order ($k = 5$) as functions of the collision centrality in lead-lead collisions at an energy of $\sqrt{s_{\mathrm{NN}}}=~5.02$~TeV. [...]
CMS-CR-2023-010.- Geneva : CERN, 2023 - 12 p. Fulltext: PDF;
In : 11th International Conference of the Balkan Physical Union - BPU11 Congress, Belgrade, Rs, 28 Aug - 1 Sep 2022

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2023-02-06
15:54
Status of the CMS pixel detector / Veszpremi, Viktor (Budapest, RMKI) /CMS Collaboration
The tracking detector of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) is an all-silicon device. It is comprised of two sub-detectors. [...]
CMS-CR-2023-013.- Geneva : CERN, 2023 - 14 p. Fulltext: PDF;
In : International Workshop on Semiconductor Pixel Detectors for Tracking and Imaging, Santa Fe, Us, 11 - 16 Dec 2022

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2023-02-06
15:51
Results on 3D Pixel Sensors for the CMS Upgrade at the High Luminosity LHC / Ceccarelli, Rudy (INFN, Florence ; Florence U.) /CMS Collaboration
The High Luminosity upgrade of the CERN Large Hadron Collider (HL-LHC) calls for new high-radiation tolerant silicon pixel sensors, capable of withstanding, in the innermost tracker layer of the CMS experiment, fluences up to $1.5\times10^{16}\,\mathrm{n_{eq}cm^{-2}}$ (1 MeV equivalent neutrons) before being replaced. An extensive R\&D; program aiming at 3D pixel sensors, built with a top-side only process, has been put in place in CMS in collaboration with FBK (Trento, Italy) and CNM (Barcelona, Spain) foundries. The basic 3D cell size has an area of $25\times100$ $\mu\mathrm{m^2}$ and is connected to a readout chip through a single, central electrode. A number of sensors were interconnected with the CMS pixel ReadOut Chip (CROC): built in 65\,nm technology, the chip will be used in the pixel tracker of the CMS experiment during HL-LHC operations. In this paper the first test beam results of irradiated 3D CROC modules are reported. The analysis of collected data shows excellent performance and hit detection efficiencies close to 99\% measured after a fluence of $1\times10^{16}\,\mathrm{n_{eq}cm^{-2}}$ while meeting the noise occupancy requirements of the innermost tracker layer..
CMS-CR-2023-008.- Geneva : CERN, 2023 - 10 p. Fulltext: PDF;
In : International Workshop on Semiconductor Pixel Detectors for Tracking and Imaging, Santa Fe, Us, 11 - 16 Dec 2022

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2023-02-06
15:50
Higgs measurements from CMS / Trevisani, Nicolo' (KIT, Karlsruhe, EKP) /CMS Collaboration
Ten years after the discovery of the Higgs boson in 2012, the data collected by CMS during the LHC Run 2 allows measuring many of the properties of this particle. A review of the recent Higgs results from CMS is presented in this report. [...]
CMS-CR-2023-007.- Geneva : CERN, 2023 - 9 p. Fulltext: PDF;
In : 8th Symposium on Prospects in the Physics of Discrete Symmetries, Baden-baden, Germany, 7 - 11 Nov 2022

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2023-02-06
15:48
Characterization of Planar Pixel Sensors for High-luminosity Upgrade of the CMS Detector / Ebrahimi, Aliakbar (PSI, Villigen) ; Meschini, Marco (INFN, Florence)
The luminosity of the Large Hadron Collider (LHC) at CERN will be upgraded to $\rm{7.5 \times 10^{34}}$ $\rm{cm^{-2}s^{-1}}$. The increased luminosity leads to an increased particle fluence and ionizing dose in the detectors. [...]
CMS-CR-2023-009.- Geneva : CERN, 2023 - 7 p. Fulltext: PDF;
In : International Workshop on Semiconductor Pixel Detectors for Tracking and Imaging, Santa Fe, Us, 11 - 16 Dec 2022

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2023-02-06
14:50
Simulated performance and calibration of CMS Phase-2 Upgrade Inner Tracker sensors / Vami, Tamas Almos (Johns Hopkins U.) ; Swartz, Morris (Johns Hopkins U.) /CMS Collaboration
The next upgrade of the Large Hadron Collider (LHC) is planned from 2026 when the collider will move to its High Luminosity phase (HL-LHC). The CMS detector needs to be substantially upgraded during this period to exploit the fourfold increase in luminosity provided by the HL-LHC. [...]
CMS-CR-2023-003.- Geneva : CERN, 2023 - 13 p. Fulltext: PDF;
In : International Workshop on Semiconductor Pixel Detectors for Tracking and Imaging, Santa Fe, Us, 11 - 16 Dec 2022

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2023-02-06
14:49
Deep learning techniques for energy clustering in the CMS electromagnetic calorimeter / Marzocchi, Badder (Northeastern U.) /CMS Collaboration
The reconstruction of electrons and photons in CMS depends on topological clustering of the energy deposited by an incident particle in different crystals of the electromagnetic calorimeter (ECAL). These clusters are formed by aggregating neighbouring crystals according to the expected topology of an electromagnetic shower in the ECAL. [...]
CMS-CR-2022-275.- Geneva : CERN, 2022 - 4 p. Fulltext: PDF;
In : 2022 IEEE Nuclear Science Symposium (NSS), Medical Imaging Conference (MIC) and Room Temperature Semiconductor Detector (RTSD) Conference (NSS/MIC 2022), Milan, Italy, 5 - 12 Nov 2022

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