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CMS Conference Reports

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2024-03-18
15:13
Nonresonant central exclusive production from CMS+TOTEM / Sikler, Ferenc (Budapest, RMKI) /CMS and TOTEM Collaborations
The central exclusive production of charged hadron pairs in pp collisions at a centre-of-mass energy of 13 TeV is examined, based on data collected in a special high-$\beta^*$ run of the LHC. Events are selected by requiring both scattered protons detected in the TOTEM Roman pots, exactly two oppositely charged identified particles in the CMS silicon tracker, and the energy-momentum balance of these four particles. [...]
CMS-CR-2024-051.- Geneva : CERN, 2024 - 8 p. Fulltext: PDF;
In : 23rd Zimanyi School Winter Workshop (Zimanyi 23), Budapest, Hungary, 4 - 8 Dec 2023

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2024-03-18
15:13
Selection of electroweak physics highlights from CMS: measurements of triple and quartic gauge couplings / Szleper, Michal (NCBJ, Swierk) /CMS Collaboration
Run 2 of the LHC has produced a lot of physics results from the electroweak sector of the Standard Model. We briefly overview CMS results that relate to measurements of triple and quartic gauge couplings: diboson, vector boson fusion, vector boson scattering and triboson production. [...]
CMS-CR-2024-049.- Geneva : CERN, 2024 - 11 p. Fulltext: PDF;
In : 30th Cracow Epiphany Conference on on Precision Physics at High Energy Colliders: dedicated to the memory of Staszek Jadach (Epiphany 2024), Cracow, Poland, 8 - 12 Jan 2024

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2024-03-18
10:48
Four tops, SM and BSM by ATLAS and CMS, including EFT interpretations / Bhowmik, Sandeep (Cantabria Inst. of Phys.) /ATLAS and CMS Collaborations
This article presents the observation of four-top-quark ($\rm t\bar{t}t\bar{t}$) production in proton-proton collisions by the ATLAS and CMS experiments at the CERN LHC. The analysis is performed using data samples collected by both experiments separately at a center-of-mass energy of 13 TeV during 2016-2018 and corresponding to an integrated luminosity of 140 $\rm fb^{-1}$ and 138 $\rm fb^{-1}$ by the ATLAS and CMS Collaborations respectively. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of the measured $\rm t\bar{t}t\bar{t}$ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations by the ATLAS and 5.6 (4.9) standard deviations by CMS experiment. The $\rm t\bar{t}t\bar{t}$ production cross section is measured to be $\rm 22.5^{+6.6}_{-5.5}$ fb and $\rm 17.7^{+4.4}_{-4.0}$ fb by the ATLAS and CMS experiment respectively, in agreement with the available standard model predictions. Data are also used by the ATLAS experiment to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect $\rm t\bar{t}t\bar{t}$ production..
CMS-CR-2024-056.- Geneva : CERN, 2024 - 11 p. Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons , Mumbai, In, 28 Nov - 2 Dec 2023

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2024-03-18
10:48
Correlations between anisotropy flow and mean transverse momentum using subevent cumulants in small systems at CMS / Singh, Rohit Kumar (Indian Inst. Tech., Madras) /CMS Collaboration
A measurement of correlations between mean transverse momentum and multiparticle cumulants in pp at $\sqrt{s} = 13 \, \text{TeV}$, proton-lead (pPb) at $\sqrt{s_{\mathrm{NN}}} = 8.16 \, \text{TeV}$, and peripheral lead-lead (PbPb) collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02 \, \text{TeV}$ are presented for Fourier harmonics $n=2$ and $n=3$. Notably, sign changes in modified Pearson correlators are observed in pp and pPb systems as a function of charged particle multiplicity, but these changes disappear with an increased pseudorapidity gap. [...]
CMS-CR-2024-041.- Geneva : CERN, 2024 - 6 p. Fulltext: PDF;
In : 16th Workshop on Particle Correlations and Femtoscopy (WPCF 2023), Catania, Italy, 6 - 10 Nov 2023

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2024-03-11
11:08
In-situ monitoring of the CSC gas gain at CMS / Rawal, Neha (Florida U.) /CMS Collaboration
The Cathode Strip Chambers (CSCs) are multi-wire proportional chambers with cathode strip readout, and they constitute the primary muon tracking device in the endcaps of the CMS (Compact Muon Solenoid) experiment at the Large Hadron Collider (LHC). The CSCs have accumulated a significant radiation dose since the beginning of LHC operations, and it is important to monitor any possible signs of aging and confirm that the detector can sustain the full integrated luminosity expected at the HL-LHC ($3000 \ \text{fb}^{-1}$). [...]
CMS-CR-2024-043.- Geneva : CERN, 2024 - 6 p. Fulltext: PDF;
In : The 3rd International Conference on Detector Stability and Aging Phenomena in Gaseous Detectors

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2024-03-04
18:47
Search for a standard model-like Higgs boson in the mass range between 70 and 110$~\mathrm{GeV}$ in the diphoton final state in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ / Tao, Junquan (Beijing, Inst. High Energy Phys.) /CMS Collaboration
The results of a search for a standard model-like Higgs boson decaying into two photons in the mass range between 70 and 110$~\mathrm{GeV}$ are presented.The analysis uses the data set collected with the CMS experiment in proton-proton collisions corresponding to, respectively, $36.3~\mathrm{fb}^{-1}$, $41.5~\mathrm{fb}^{-1}$ and $54.4~\mathrm{fb}^{-1}$, during the 2016, 2017 and 2018 LHC running periods, at $\sqrt{s}=13~\mathrm{TeV}$. The expected and observed $95\pct$ confidence level upper limits on the product of the cross section and branching fraction of an additional Higgs boson, with respect the one with around 125$~\mathrm{GeV}$ mass, decaying into two photons are presented. [...]
CMS-CR-2024-047.- Geneva : CERN, 2024 - 2 p. Fulltext: PDF;
In : 9th China LHC Physics Workshop, Shanghai, China, 15 - 20 Nov 203

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2024-03-04
16:54
Performance of new CO2 based mixture in CMS Improved Resistive Plate Chambers in HL-LHC environment / Gomes Pinheiro, Joao Pedro (Rio de Janeiro State U.) ; Shah, Mehar Ali (Iberoamericana U.) ; Eiriz Sanchez, Lucia (Dundee U.) /CMS Collaboration
Resistive Plate Chamber (RPCs) detectors in the Compact Muon Solenoid (CMS) experiment operate with a gas mixture comprised of 95.2pct of C2H2F4, that provides a high number of ion-electron pairs, 4.5pct of iC4H10, that ensures the suppression of photon-feedback effects and 0.3pct of SF6, used as an electron quencher to further operate the detector in streamer-free mode. C2H2F4 is known to be a Greenhouse gas with a global warming potential (GWP) of 1430. [...]
CMS-CR-2024-046.- Geneva : CERN, 2024 - 6 p. Fulltext: PDF;
In : The 3rd International Conference on Detector Stability and Aging Phenomena in Gaseous Detectors

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2024-03-04
16:54
Studies of eco-friendly gas mixtures for RPC detectors / Dalia Lucero, Ramirez Guadarrama (Iberoamericana U.) ; Ramos Lopez, Dayron (INFN, Bari) /CMS Collaboration
In the context of climate change, one of the main contributors to global warming is the greenhouse effect. Regulations have been implemented in different areas of society to reduce or ban the use of greenhouse gases, such as freon. [...]
CMS-CR-2024-044.- Geneva : CERN, 2024 - 5 p. Fulltext: PDF;
In : The 3rd International Conference on Detector Stability and Aging Phenomena in Gaseous Detectors

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2024-03-04
16:53
Study of discharges observed in the CMS GE1/1 station during LHC Run-3 / Calzaferri, Simone (INFN, Pavia) /CMS Collaboration
Since July 2022, GE1/1, the first station using Gas Electron Multiplier (GEM) technology in the Compact Muon Solenoid (CMS) experiment, has been participating in the data-taking in proton-proton (p-p) collisions. This station is the first of three (GE1/1, GE2/1 and ME0) planned to be installed in CMS, to cope with the challenging conditions given by the upgrade of luminosity of the Large Hadron Collider (High-Luminosity LHC program, or HL-LHC) [3]. [...]
CMS-CR-2024-050.- Geneva : CERN, 2024 - 6 p. Fulltext: PDF;
In : The 3rd International Conference on Detector Stability and Aging Phenomena in Gaseous Detectors

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2024-03-04
16:53
Longevity studies for the CMS Drift Tubes towards HL-LHC / Gonzalez Caballero, Isidro (Oviedo U.)
The High Luminosity LHC (HL-LHC) program will pose a great challenge for the CMS Muon System. Existing subdetectors, which consist of Drift Tubes (DT), Resistive Plate Chambers (RPC) and Cathode Strip Chambers (CSC), will have to operate at 5 times larger instantaneous luminosity than the designed for, and, consequently, will have to sustain about 10 times the original LHC integrated luminosity. [...]
CMS-CR-2024-048.- Geneva : CERN, 2024 - 6 p. Fulltext: PDF;
In : The 3rd International Conference on Detector Stability and Aging Phenomena in Gaseous Detectors

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