CERN Accelerating science

CMS Conference Reports

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2022-06-27
18:08
Performance of highly irradiated FBK 3D and planar pixel detectors / Ceccarelli, Rudy (INFN, Florence ; Florence U.) /CMS Collaboration
The High Luminosity upgrade of the CERN Large Hadron Collider (HL-LHC) requires new radiation tolerant silicon pixel sensors. In the case of the CMS experiment, the first layer of pixel detectors will be installed at about 3 cm from the beam line, where an integrated fluence of about $2\times10^{16} \mathrm{n_{eq}cm^{-2}}$ (1 MeV equivalent neutrons) is expected (HL-LHC Runs 4 and 5). The first tracker layer will be substituted before the start of HL-LHC Run 6. The 3D concept for silicon pixel sensors presents several advantages with respect to traditional (planar) sensors. Thanks to short anode-to-cathode distances, 3D sensors are much more resistant to radiation damage, making them suitable for use in the inner layer of the future tracker. This paper describes results from beam tests with highly irradiated planar and 3D sensor and RD53A readout chip combinations. RD53A is the first prototype in 65 nm technology developed by the RD53 collaboration for use in HL-LHC pixel detectors. The sensors were made in FBK foundry in Trento, Italy, and their development was done in collaboration with INFN (Istituto Nazionale di Fisica Nucleare, Italy). Both planar and 3D sensors feature a pixel area of $2500$ $\mu\mathrm{m^2}$ and an active thickness of 150 $\mu$m. The pixel detectors, irradiated to fluences up to $2.4\times10^{16} \mathrm{n_{eq}cm^{-2}}$, were tested in the DESY test beam facility and the analysis of the data shows excellent performances even for the highest irradiation fluences. All results are obtained in the framework of the CMS R\&D; activities..
CMS-CR-2022-075.- Geneva : CERN, 2022 - 3 p. Fulltext: PDF;
In : 15th Pisa Meeting on Advanced Detectors, La Biodola - Isola D'elba, It, 22 - 28 May 2022

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2022-06-27
18:07
The CMS Precision Proton Spectrometer precision timing with scCVD diamond crystals. / Bossini, Edoardo (INFN, Pisa ; Pisa U.) /CMS and TOTEM Collaborations
The CMS Proton Precision Spectrometer (PPS), operating at the LHC, makes use of 3D silicon tracking stations to measure the kinematics of protons scattered in the very forward region, as well as timing detectors based on planar single crystal CVD diamond to measure the proton time-of-arrival with high precision. The time information is used to reconstruct the longitudinal position of the proton interaction vertex and to suppress pile-up background. [...]
CMS-CR-2022-074.- Geneva : CERN, 2022 - 3 p. Fulltext: PDF;
In : 15th Pisa Meeting on Advanced Detectors, La Biodola - Isola D'elba, It, 22 - 28 May 2022

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2022-06-27
18:07
The CMS Pixel Detector for the High Luminosity LHC / Cassese, Antonio (INFN, Florence) /CMS Collaboration
The High Luminosity Large Hadron Collider (HL-LHC) at CERN is expected to collide protons at a centre-of-mass energy of 14 TeV and to reach the unprecedented peak instantaneous luminosity of $5$--$7.5\times 10^{34}$ cm$^{-2}$s$^{-1}$ with an average number of pileup events of $140$--$200$. This will allow the CMS experiment to collect integrated luminosities up to $3000$--$4000$ fb$^{-1}}$ during the project lifetime. The current CMS pixel detector cannot sustain the expected radiation levels and data rates foreseen at HL-LHC and thus a completely new Inner Tracker will be installed in order to fully exploit the delivered luminosity under the highly demanding conditions. [...]
CMS-CR-2022-073.- Geneva : CERN, 2022 - 3 p. Fulltext: PDF;
In : 15th Pisa Meeting on Advanced Detectors, La Biodola - Isola D'elba, It, 22 - 28 May 2022

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2022-06-27
18:00
Search for long-lived particles decaying to a pair of muons in proton-proton collisions at $\sqrt s = 13$ TeV. / Sonawane, Mangesh Avinash (Vienna, OAW) /CMS Collaboration
An inclusive search for long-lived exotic particles decaying into a pair of muons is presented. The experimental signature is a pair of oppositely charged muons originating in a common secondary vertex displaced from the proton-proton collision point by distances ranging from several hundred micrometers to several meters. [...]
CMS-CR-2022-069.- Geneva : CERN, 2022 - 7 p. Fulltext: PDF;
In : 56th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 12 - 19 Mar 2022

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2022-06-27
18:00
Selected SUSY results from CMS / Trapote Fernandez, Andrea (Oviedo U.) /CMS Collaboration
Supersymmetry is a promising extension of the standard model that introduce a relation between bosons and fermions and resolves some problems that the standard model cannot explain as the hierarchy problem. For each known particle we expect a super-symmetric partner differing only in half a unit of spin. [...]
CMS-CR-2022-006.- Geneva : CERN, 2022 - 5 p. Fulltext: PDF;
In : 32nd Rencontres de Blois on Particle Physics and Cosmology, Blois, Fr, 17 - 22 Oct 2021

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2022-06-07
13:30
Single top and rare top quark production (including FCNC searches) at CMS and ATLAS / May, Samuel (Boston U.) /ATLAS and CMS Collaborations
Measurements of single top and rare top quark production may be sensitive to theories of physics beyond the standard model (SM), especially those in which the energy scale of new physics is beyond the energies directly accessible at the Large Hadron Collider. Such models may be observable through signatures like forbidden SM interactions or deviations of the top quark's couplings from the SM predictions. [...]
CMS-CR-2022-066.- Geneva : CERN, 2022 - 5 p. Fulltext: PDF;
In : 56th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, It, 19 - 26 Mar 2022

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2022-06-07
13:30
YSF Search for production of charginos and neutralinos in hadronic final states at CMS / Kanuganti, Ankush Reddy (Baylor U.) /CMS Collaboration
The results from a search for chargino-neutralino or chargino pair production via electroweak interactions are summarized. The results are based on a sample of $\sqrt{s}$ = 13 TeV proton-proton collisions from the LHC, recorded with the CMS detector and corresponding to an integrated luminosity of 137\,fb$^{-1}$. [...]
CMS-CR-2022-065.- Geneva : CERN, 2022 - 5 p. Fulltext: PDF;
In : 56th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 12 - 19 Mar 2022

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2022-05-30
18:46
Standard Model soft QCD at CMS and ATLAS / Veres, Gabor (Eotvos U.) /ATLAS and CMS Collaborations
Recent results from the ATLAS and CMS Collaborations will be summarized on various measurements related to soft QCD processes. Those include double parton scattering in different final state channels, diffraction and rapidity gap distributions, lepton pair production via photon fusion, strange hadron production as a function of mass and transverse momentum in heavy ion collisions, and particle correlations. [...]
CMS-CR-2022-067.- Geneva : CERN, 2022 - 5 p. Fulltext: PDF;
In : 56th Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, It, 19 - 26 Mar 2022

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2022-05-30
18:46
B physics at CMS and ATLAS / Simone, Federica Maria (INFN, Bari ; Bari U.) /ATLAS and CMS Collaborations
Recent results in the B-physics field achieved using proton-proton collision data at $\sqrt{s}=13$ TeV by ATLAS and CMS are presented\footnote{Copyright 2022 CERN for the benefit of the ATLAS and CMS Collaborations. Reproduction of this article or parts of it is allowed as specified in the CC-BY-4.0 license}. They include the first observation of $B^{0}\to\psi(2\mathrm{S})K^0_{\mathrm{S}}\pi^{+}\pi^{-}$ and $B^{0}_{\mathrm{s}}\to\psi(2S)K^0_{\mathrm{S}}$ decays at the CMS experiment, and the study of the $B^{+}_{\mathrm{c}}\to J/\psi D^{+}_{\mathrm{s}}$ and $B^{+}_{\mathrm{c}}\to J/\psi D^{*+}_{\mathrm{s}}$ decays at the ATLAS experiment with Run 2 data..
CMS-CR-2022-063.- Geneva : CERN, 2022 - 8 p. Fulltext: PDF;
In : 56th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 12 - 19 Mar 2022

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2022-05-30
18:46
SM Higgs inclusive and differential XS measurements at CMS and ATLAS / Viliani, Lorenzo (INFN, Florence) /ATLAS and CMS Collaborations
Ten years after the announcement of the Higgs boson discovery by the ATLAS and CMS collaborations at the CERN LHC, the paradigm has definitely changed from searching for a new resonance to performing precision measurements of its properties. In fact, thanks to the large amount of proton-proton collision data collected by the ATLAS and CMS experiments in the LHC Run 2, we can now perform precise differential measurements of the Higgs boson production cross section in several decay channels and for all the main production mechanisms. [...]
CMS-CR-2022-060.- Geneva : CERN, 2022 - 9 p. Fulltext: PDF;
In : 56th Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, It, 12 - 19 Mar 2022

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