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Search for standard model production of four top quarks with same-sign and multilepton final states in proton–proton collisions at √s=13TeV
(2018)The European Physical Journal CA search for standard model production of four top quarks (tt¯tt¯) is reported using events containing at least three leptons (e,μ) or a same-sign lepton pair. The events are produced in proton–proton collisions at a center-of-mass energy of 13TeV at the LHC, and the data sample, recorded in 2016, corresponds to an integrated luminosity of 35.9fb−1. Jet multiplicity and flavor are used to enhance signal sensitivity, and dedicated control ...Journal Article -
Constraints on the double-parton scattering cross section from same-sign W boson pair production in proton-proton collisions at √s=8 TeV
(2018)Journal of High Energy PhysicsA first search for same-sign WW production via double-parton scattering is performed based on proton-proton collision data at a center-of-mass energy of 8 TeV using dimuon and electron-muon final states. The search is based on the analysis of data corresponding to an integrated luminosity of 19.7 fb−1. No significant excess of events is observed above the expected single-parton scattering yields. A 95% confidence level upper limit of 0.32 ...Journal Article -
Search for Higgsino pair production in 𝑝𝑝 collisions at √s=13 TeV in final states with large missing transverse momentum and two Higgs bosons decaying via H→bb̄
(2018)Physical Review DResults are reported from a search for new physics in 13 TeV proton-proton collisions in the final state with large missing transverse momentum and two Higgs bosons decaying via H→b¯b. The search uses a data sample accumulated by the CMS experiment at the LHC in 2016, corresponding to an integrated luminosity of 35.9 fb−1. The search is motivated by models based on gauge-mediated supersymmetry breaking, which predict the electroweak ...Journal Article -
Search for top squarks and dark matter particles in opposite-charge dilepton final states at √s=13 TeV
(2018)Physical Review DA search for new physics is presented in final states with two oppositely charged leptons (electrons or muons), jets identified as originating from b quarks, and missing transverse momentum (pmissT). The search uses proton-proton collision data at √s=13 TeV amounting to 35.9 fb−1 of integrated luminosity collected using the CMS detector in 2016. Hypothetical signal events are efficiently separated from the dominant t¯t background with ...Journal Article -
Search for supersymmetry in events with at least three electrons or muons, jets, and missing transverse momentum in proton-proton collisions at √s=13 TeV
(2018)Journal of High Energy PhysicsA search for new physics is carried out in events with at least three electrons or muons in any combination, jets, and missing transverse momentum. Results are based on the sample of proton-proton collision data produced by the LHC at a center-of-mass energy of 13 TeV and collected by the CMS experiment in 2016. The data sample analyzed corresponds to an integrated luminosity of 35.9 fb−1. Events are classified according to the number of ...Journal Article -
Search for single production of a vector-like T quark decaying to a Z boson and a top quark in proton-proton collisions at s = 13 TeV
(2018)Physics letters BA search is presented for single production of a vector-like quark (T) decaying to a Z boson and a top quark, with the Z boson decaying leptonically and the top quark decaying hadronically. The search uses data collected by the CMS experiment in proton–proton collisions at a center-of-mass energy of 13 TeV in 2016, corresponding to an integrated luminosity of 35.9 fb-1. The presence of forward jets is a particular characteristic of single ...Journal Article -
Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/ c in PbPb collisions at √sNN=5.02 TeV
(2018)Physics Letters BThe Fourier coefficients v2 and v3 characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at sNN=5.02 TeV are measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, 1<pT<100 GeV/c. The analysis focuses on the pT>10 GeV/c range, where anisotropic azimuthal distributions should reflect the path-length dependence of parton energy loss ...Journal Article -
Measurements of tt¯ cross sections in association with b jets and inclusive jets and their ratio using dilepton final states in pp collisions at s√ = 13 TeV
(2018)Physics Letters BThe cross sections for the production of tt¯bb¯ and tt¯jj events and their ratio σtt¯bb¯/σtt¯jj are measured using data corresponding to an integrated luminosity of 2.3 fb−1collected in pp collisions at s=13 TeV with the CMS detector at the LHC. Events with two leptons (e or μ) and at least four reconstructed jets, including at least two identified as b quark jets, in the final state are selected. In the full phase space, the measured ...Journal Article -
Search for low-mass resonances decaying into bottom quark-antiquark pairs in proton-proton collisions at √s=13 TeV
(2018)Physical Review DA search for narrow, low-mass, scalar, and pseudoscalar resonances decaying to bottom quark-antiquark pairs is presented. The search is based on events recorded in √s=13 TeV proton-proton collisions with the CMS detector at the LHC, collected in 2016, and corresponding to an integrated luminosity of 35.9 fb−1. The search selects events in which the resonance would be produced with high transverse momentum because of the presence of ...Journal Article -
Precision measurement of the structure of the CMS inner tracking system using nuclear interactions
(2018)Journal of InstrumentationThe structure of the CMS inner tracking system has been studied using nuclear interactions of hadrons striking its material. Data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded in 2015 at the LHC are used to reconstruct millions of secondary vertices from these nuclear interactions. Precise positions of the beam pipe and the inner tracking system elements, such as the pixel detector support tube, and barrel ...Journal Article