Search
Results
-
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 -
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 -
Observation of WWγ Production and Search for Hγ Production in Proton-Proton Collisions at √s = 13 TeV
(2024)Physical Review LettersThe observation of WWγ production in proton-proton collisions at a center-of-mass energy of 13 TeV with an integrated luminosity of 138 fb⁻¹ is presented. The observed (expected) significance is 5.6 (5.1) standard deviations. Events are selected by requiring exactly two leptons (one electron and one muon) of opposite charge, moderate missing transverse momentum, and a photon. The measured fiducial cross section for WWγ is WWγ is 5.9 ± ...Journal Article -
New Structures in the J/ψJ/ψ Mass Spectrum in Proton-Proton Collisions at √s = 13TeV
(2024)Physical Review LettersA search is reported for near-threshold structures in the J/ψJ/ψ invariant mass spectrum produced in proton-proton collisions at √s = 13TeV from data collected by the CMS experiment, corresponding to an integrated luminosity of 135 fb⁻¹. Three structures are found, and a model with quantum interference among these structures provides a good description of the data. A new structure is observed with a local significance above 5 standard ...Journal Article -
Measurements of azimuthal anisotropy of nonprompt D⁰ mesons in PbPb collisions at √sNN = 5.02TeV
(2024)Physics Letters BMeasurements of the elliptic (v₂) and triangular (v₃) azimuthal anisotropy coefficients are presented for Image 1 mesons produced in Image 2 hadron decays (nonprompt Image 1 mesons) in lead-lead collisions at √sNN = 5.02TeV. The results are compared with previously published charm meson anisotropies measured using prompt Image 1 mesons. The data were collected with the CMS detector in 2018 with an integrated luminosity of 0.58nb⁻¹. Azimuthal ...Journal Article -
Search for new Higgs bosons via same-sign top quark pair production in association with a jet in proton-proton collisions at s=13TeV
(2024)Physics Letters BA search is presented for new Higgs bosons in proton-proton (pp) collision events in which a same-sign top quark pair is produced in association with a jet, via the pp→tH/A→ttc‾ and pp→tH/A→ttu‾ processes. Here, H and A represent the extra scalar and pseudoscalar boson, respectively, of the second Higgs doublet in the generalized two-Higgs-doublet model (g2HDM). The search is based on pp collision data collected at a center-of-mass energy ...Journal Article -
Study of azimuthal anisotropy of ϒ(1S) mesons in pPb collisions at √sNN = 8.16 TeV
(2024)Physics Letters BThe azimuthal anisotropy of Y(1S) mesons in high-multiplicity proton-lead collisions is studied using data collected by the CMS experiment at a nucleon-nucleon center-of-mass energy of 8.16 TeV. The Y(1S) mesons are reconstructed using their dimuon decay channel. The anisotropy is characterized by the second Fourier harmonic coefficients, found using a two-particle correlation technique, in which the Y(1S) mesons are correlated with charged ...Journal Article -
Search for Scalar Leptoquarks Produced via τ -Lepton–Quark Scattering in pp Collisions at √s = 13 TeV
(2024)Physical Review LettersThe first search for scalar leptoquarks produced in τ-lepton–quark collisions is presented. It is based on a set of proton-proton collision data recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 138 fb⁻¹. The reconstructed final state consists of a jet, significant missing transverse momentum, and a τ lepton reconstructed through its hadronic or leptonic decays. ...Journal Article -
Two-particle Bose-Einstein correlations and their Lévy parameters in PbPb collisions at √sNN = 5.02 TeV
(2024)Physical Review CTwo-particle Bose–Einstein momentum correlation functions are studied for charged-hadron pairs in lead-lead collisions at a center-of-mass energy per nucleon pair of √sNN = 5.02 TeV. The data sample, containing 4.27 × 10⁹ minimum bias events corresponding to an integrated luminosity of 0.607 nb⁻¹, was collected by the CMS experiment in 2018. The experimental results are discussed in terms of a Lévy-type source distribution. The parameters ...Journal Article