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2024-11-08
10:55
Photon production in top quark events at ATLAS and CMS / Ribeiro Lopes, Beatriz (CERN) /ATLAS and CMS Collaborations
Top quark production in association with a photon offers a unique test ground for the standard model predictions, as it is sensitive to the top-photon coupling. These processes are rare when compared to standard top pair production, however the large amounts of data delivered by the LHC open the window to precise measurements. [...]
CMS-CR-2024-256.- Geneva : CERN, 2024 - 7 p. Fulltext: PDF;
In : 17th International Workshop on Top Quark Physics, Saint Malo, Fr, 22 - 27 Sep 2024

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2024-11-08
09:21
Design of a Level-1 Long-Lived Particle Trigger in the CMS Hadron Calorimeter / Kopp, Gillian Baron (Princeton U.) ; Tully, Christopher (Princeton U.) ; Chung, Wonyong Paul (Princeton U.) ; Kennedy, Kiley Elizabeth (Princeton U.) ; Hoienko, Svitlana (Princeton U.) ; Mans, Jeremiah Michael (Minnesota U.) ; Krohn, Michael David (Minnesota U.) ; Crossman, Bryan James (Minnesota U.) ; Hiltbrand, Joshua (Baylor U.) ; Skuja, Andris (Maryland U.) et al.
The Hadron Calorimeter (HCAL) in the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) was recently upgraded for Run 3 to introduce depth segmentation and online timing measurements, expanding the physics capabilities. In particular, the augmentation of the calorimeter information at the hardware trigger level enables quick identification and recording of long-lived particle decays using lower thresholds on energy-based event quantities. [...]
CMS-CR-2024-257.- Geneva : CERN, 2024 - 5 p. Fulltext: PDF;
In : 12th Edition of the Large Hadron Collider Physics Conference, Boston, Us, 3 - 7 Jun 2024

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2024-11-08
09:21
Run 3 performance and advances in heavy-flavor jet tagging in CMS / Sarkar, Uttiya (Aachen, Tech. Hochsch.) /CMS Collaboration
Identification of hadronic jets originating from heavy-flavor quarks is extremely important to several physics analyses in High Energy Physics, such as studies of the properties of the top quark and the Higgs boson, and searches for new physics. Recent algorithms used in the CMS experiment were developed using state-of-the-art machine-learning techniques to distinguish jets emerging from the decay of heavy flavour (charm and bottom) quarks from those arising from light-flavor (udsg) ones. [...]
CMS-CR-2024-247.- Geneva : CERN, 2024 - 14 p. Fulltext: PDF;
In : 42nd International Conference on High Energy Physics (ICHEP 2024), Prague, Czech Republic, 18 - 24 Jul 2024

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2024-11-04
17:52
Phase-2 CMS DAQ -- Growing from prototype boards to demonstrator systems / Hegeman, Jeroen Guido (CERN)
For the Phase-2 upgrade of the CMS experiment, the CMS central DAQ group designed and developed two custom ATCA boards. These boards provide the interfaces between the sub-detector electronics and the central CMS systems. [...]
CMS-CR-2024-294.- Geneva : CERN, 2024 - 8 p. Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics 2024, Glasgow, Gb, 30 Sep - 4 Oct 2024

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2024-11-04
17:52
Searches for BSM in top final states in CMS / Shang, Victor (Wisconsin U., Madison) /CMS Collaboration
Many open questions remain that require physics beyond the Standard Model. Results of two recent searches for physics beyond the Standard Model in top final states from the CMS Collaboration are presented. [...]
CMS-CR-2024-293.- Geneva : CERN, 2024 - 7 p. Fulltext: PDF;
In : 12th Edition of the Large Hadron Collider Physics Conference, Boston, Us, 3 - 7 Jun 2024

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2024-11-04
17:52
Ensuring Clock Phase Repeatability by Preventing Loss of the 40.078 MHz Clock in Time-Critical Detectors: A Non-disruptive Clock Switching Approach / Loukas, Nikitas (Notre Dame U.) ; Moreno, L ; Anderson, T ; Cucciati, Giacomo (Notre Dame U.) ; Eberle, Zachariah (Minnesota U.) ; Goadhouse, Stephen David (Virginia U.) ; Gorski, Thomas (Wisconsin U., Madison) ; Svetek, Ales (Wisconsin U., Madison) /CMS Collaboration
At LHC phase 2, the CMS detector electronics require precise and accurate timing to discriminate pileup events. The upgraded Back-End electronics of the barrel Electromagnetic Calorimeter supply the required high-precision clock (Time Interval Error $\sigma <$ 5 ps) to the Front-End. [...]
CMS-CR-2024-290.- Geneva : CERN, 2024 - 8 p. Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics 2024, Glasgow, Gb, 30 Sep - 4 Oct 2024

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2024-11-04
17:52
Searches for rare and Beyond the Standard Model processes in top quark production and decays with the CMS experiement / Bessidskaia Bylund, Olga (Rochester U.) /CMS Collaboration
With millions of top quarks produced at the LHC, it is an ideal sector for searching for rare top-quark decays. Besides flavor-changing neutral currents that are highly suppressed in the Standard Model, baryon and lepton number conservation can be probed in top quark events. In this conference proceeding, recent searches by the CMS experiment for rare and beyond the Standard Model top-quark production and decay with significantly increased sensitivity are discussed. [...]
CMS-CR-2024-285.- Geneva : CERN, 2024 - 8 p. Fulltext: PDF;
In : 31st International Workshop on Deep Inelastic Scattering, Grenoble, France, 8 - 12 Apr 2024

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2024-11-04
17:49
Hybrids pre-production results for the CMS Outer Tracker Phase-2 Upgrade / Blanchot, Georges (CERN)
The CMS Tracker Phase-2 Upgrade requires the production of two co-planar strip sensor (2S) modules, and strip and macro-pixel sensor (PS) modules to cope with the requirements of the HL-LHC. Altogether 47520 hybrid circuits are required to construct 8000 2S and 5880 PS modules. [...]
CMS-CR-2024-281.- Geneva : CERN, 2024 - 9 p. Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics 2024, Glasgow, Gb, 30 Sep - 4 Oct 2024

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2024-11-04
17:49
Calibration of Flavour Tagging Algorithms at the CMS Experiment - Run 3 Results and Innovations / Diekmann, Svenja (Aachen, Tech. Hochsch.) /CMS Collaboration
The efficient identification of jets originating from heavy-flavour quarks is essential for many measurements in high-energy physics, such as Higgs boson and top quark measurements as well as searches for physics beyond the standard model of particle physics. Nevertheless, differences between measured data and the simulation on which the algorithms were trained can cause performance deficits and prediction discrepancies. [...]
CMS-CR-2024-277.- Geneva : CERN, 2024 - 7 p. Fulltext: PDF;
In : 12th Edition of the Large Hadron Collider Physics Conference, Boston, Us, 3 - 7 Jun 2024

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2024-11-04
17:49
Searches for vector-like quarks in CMS / Oropeza Barrera, Cristina (Iberoamericana U.) /CMS Collaboration
Searches for T and B vector-like quarks in the single and pair production modes, respectively, using the full Run 2 proton-proton collision data at 13 TeV collected by the CMS experiment are presented. Limits on the production of these new particles are set in wide regions of the parameter space. [...]
CMS-CR-2024-275.- Geneva : CERN, 2024 - 7 p. Fulltext: PDF;
In : 12th Edition of the Large Hadron Collider Physics Conference, Boston, Us, 3 - 7 Jun 2024

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