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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 -
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 -
Muon identification using multivariate techniques in the CMS experiment in proton-proton collisions at √s = 13TeV
(2024)Journal of InstrumentationThe identification of prompt and isolated muons, as well as muons from heavy-flavour hadron decays, is an important task. We developed two multivariate techniques to provide highly efficient identification for muons with transverse momentum greater than 10 GeV. One provides a continuous variable as an alternative to a cut-based identification selection and offers a better discrimination power against misidentified muons. The other one ...Journal Article -
Search for Inelastic Dark Matter in Events with Two Displaced Muons and Missing Transverse Momentum in Proton-Proton Collisions at √s = 13 TeV
(2024)Physical Review LettersA search for dark matter in events with a displaced nonresonant muon pair and missing transverse momentum is presented. The analysis is performed using an integrated luminosity of 138 fb⁻¹ of proton-proton (pp) collision data at a center-of-mass energy of 13 TeV produced by the LHC in 2016–2018. No significant excess over the predicted backgrounds is observed. Upper limits are set on the product of the inelastic dark matter production ...Journal Article