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 |
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2023-02-06 15:56 |
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2023-02-06 15:54 |
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2023-02-06 15:54 |
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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 |
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2023-02-06 15:48 |
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2023-02-06 14:50 |
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2023-02-06 14:49 |
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