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Observation of the J/ψ→μ+μ−μ+μ− decay in proton-proton collisions at √s = 13TeV
(2024)Physical Review DJournal Article -
Search for dark matter particles in W⁺W⁻ events with transverse momentum imbalance in proton-proton collisions at √s = 13 TeV
(2024)Journal of High Energy PhysicsA search for dark matter particles is performed using events with a pair of W bosons and large missing transverse momentum. Candidate events are selected by requiring one or two leptons (ℓ = electrons or muons). The analysis is based on proton-proton collision data collected at a center-of-mass energy of 13 TeV by the CMS experiment at the LHC and corresponding to an integrated luminosity of 138 fb⁻¹. No significant excess over the expected ...Journal Article -
Higher-order moments of the elliptic flow distribution in PbPb collisions at √sNN = 5.02 TeV
(2024)Journal of High Energy PhysicsThe hydrodynamic flow-like behavior of charged hadrons in high-energy lead-lead collisions is studied through multiparticle correlations. The elliptic anisotropy values based on different orders of multiparticle cumulants, v₂{2k}, are measured up to the tenth order (k = 5) as functions of the collision centrality at a nucleon-nucleon center-of-mass energy of √sNN = 5.02 TeV. The data were recorded by the CMS experiment at the LHC and ...Journal Article -
CMS ECAL VFE design, production and testing
(2024)Journal of InstrumentationMaintaining the required performance of the CMS electromagnetic calorimeter (ECAL) barrel at the High-Luminosity Large Hadron Collider (HL-LHC) requires the replacement of the entire on-detector electronics. 12240 new very front end (VFE) cards will amplify and digitize the signals of 61200 lead-tungstate crystals instrumented with avalanche photodiodes. The VFE cards host five channels of CATIA pre-amplifier ASICs followed by LiTE-DTU ...Journal Article -
Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμbb and ττbb final states
(2024)The European Physical Journal CA search for exotic decays of the Higgs boson (H) with a mass of 125 GeV to a pair of light pseudoscalars a1 is performed in final states where one pseudoscalar decays to two b quarks and the other to a pair of muons or τ leptons. A data sample of proton–proton collisions at √s = 13 TeV cor- responding to an integrated luminosity of 138 fb^−1 recorded with the CMS detector is analyzed. No statistically signifi- cant excess is ...Journal Article -
Search for supersymmetry in final states with disappearing tracks in proton-proton collisions at √𝑠=13 TeV
(2024)Physical Review DJournal Article -
Search for flavor changing neutral current interactions of the top quark in final states with a photon and additional jets in proton-proton collisions at √𝑠 =13 TeV
(2024)Physical Review DJournal Article -
Universal test system for boards hosting bPOL12V DC-DC converters
(2024)Journal of InstrumentationThe ECAL Barrel and MTD Barrel Timing Layer subdetectors of CMS are approaching series production of electronic boards, including voltage conditioning PCBs: LVRs and PCCs respectively. 2448 LVRs and 864 PCCs will be installed during LS3 of the LHC. These boards are hosting radiation-tolerant bPOL12V ASICs which convert a broad input voltage range into required voltage levels for microelectronics between 1.2-2.5 V. Each card must be tested ...Journal Article -
Search for the lepton flavor violating τ → 3μ decay in proton-proton collisions at √s = 13TeV
(2024)Physics Letters BA search for the lepton flavor violating τ → 3μ decay is performed using proton-proton collision events at a center-of-mass energy of 13 TeV collected by the CMS experiment at the LHC in 2017–2018, corresponding to an integrated luminosity of 97.7 fb⁻¹. Tau leptons produced in both heavy-flavor hadron and W boson decays are exploited in the analysis. No evidence for the decay is observed. The results of this search are combined with an ...Journal Article -
Search for an exotic decay of the Higgs boson into a Z boson and a pseudoscalar particle in proton-proton collisions at √s = 13 TeV
(2024)Physics Letters BA search for an exotic decay of the Higgs boson to a Z boson and a light pseudoscalar particle (a), decaying to a pair of leptons and a pair of photons, respectively, is presented. The search is based on proton-proton collision data at a center-of-mass energy of √s = 13TeV, collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 138 fb⁻¹. The analysis probes pseudoscalar masses mₐ between 1 and 30 GeV, ...Journal Article