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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 -
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 -
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 -
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 -
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 -
Measurement of the τ lepton polarization in Z boson decays in proton-proton collisions at √s = 13 TeV
(2024)Journal of High Energy PhysicsJournal Article -
Evidence for the Higgs Boson Decay to a Z Boson and a Photon at the LHC
(2024)Physical Review LettersThe first evidence for the Higgs boson decay to a Z boson and a photon is presented, with a statistical significance of 3.4 standard deviations. The result is derived from a combined analysis of the searches performed by the ATLAS and CMS Collaborations with proton-proton collision datasets collected at the CERN Large Hadron Collider (LHC) from 2015 to 2018. These correspond to integrated luminosities of around 140fb⁻¹ for each experiment, ...Journal Article