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Search for excited leptons in proton-proton collisions at √s = 8 TeV
(2016)Journal of High Energy PhysicsA search for compositeness of electrons and muons is presented using a data sample of proton-proton collisions at a center-of-mass energy of s√=8 TeV collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 19.7 fb−1. Excited leptons (ℓ *) produced via contact interactions in conjunction with a standard model lepton are considered, and a search is made for their gauge decay modes. The decays considered ...Journal Article -
Search for a very light NMSSM Higgs boson produced in decays of the 125 GeV scalar boson and decaying into τ leptons in pp collisions at √s=8 TeV
(2016)Journal of High Energy PhysicsA search for a very light Higgs boson decaying into a pair of τ leptons is presented within the framework of the next-to-minimal supersymmetric standard model. This search is based on a data set corresponding to an integrated luminosity of 19.7 fb−1 of proton-proton collisions collected by the CMS experiment at a centre-of-mass energy of 8 TeV. The signal is defined by the production of either of the two lightest scalars, h1 or h2, via ...Journal Article -
Search for the production of an excited bottom quark decaying to tW in proton-proton collisions at s√=8 TeV
(2016)Journal of High Energy PhysicsA search is presented for a singly produced excited bottom quark (b*) decaying to a top quark and a W boson in the all-hadronic, lepton+jets, and dilepton final states in proton-proton collisions at s√=8 TeV recorded by the CMS experiment at the CERN LHC. Data corresponding to an integrated luminosity of 19.7 fb−1 are used. No significant excess of events is observed with respect to standard model expectations. We set limits at 95% ...Journal Article -
Correlations between jets and charged particles in PbPb and pp collisions at √sNN = 2.76 TeV
(2016)Journal of High Energy PhysicsThe quark-gluon plasma is studied via medium-induced changes to correlations between jets and charged particles in PbPb collisions compared to pp reference data. This analysis uses data sets from PbPb and pp collisions with integrated luminosities of 166 μb−1 and 5.3 pb−1, respectively, collected at sNN−−−√=2.76 TeV. The angular distributions of charged particles are studied as a function of relative pseudorapidity (Δη) and relative ...Journal Article -
Reconstruction and identification of τ lepton decays to hadrons and ντ at CMS
(2016)Journal of InstrumentationThis paper describes the algorithms used by the CMS experiment to reconstruct and identify τ → hadrons + ντ decays during Run 1 of the LHC. The performance of the algorithms is studied in proton-proton collisions recorded at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb−1. The algorithms achieve an identification efficiency of 50–60%, with misidentification rates for quark and gluon jets, electrons, ...Journal Article -
Observation of top quark pairs produced in association with a vector boson in pp collisions at √s=8 TeV
(2016)Journal of High Energy PhysicsMeasurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb−1, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed ...Journal Article -
Search for the associated production of a Higgs boson with a single top quark in proton-proton collisions at √s= 8 TeV
(2016)Journal of High Energy PhysicsThis paper presents the search for the production of a Higgs boson in association with a single top quark (tHq), using data collected in proton-proton collisions at a center-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb−1. The search exploits a variety of Higgs boson decay modes resulting in final states with photons, bottom quarks, and multiple charged leptons, including tau leptons, and employs a variety ...Journal Article -
Measurement of the differential cross sections for top quark pair production as a function of kinematic event variables in pp collisions at √s=7 and 8 TeV
(2016)Physical Review DMeasurements are reported of the normalized differential cross sections for top quark pair production with respect to four kinematic event variables: the missing transverse energy; the scalar sum of the jet transverse momentum (pT); the scalar sum of the pT of all objects in the event; and the pT of leptonically decaying W bosons from top quark decays. The data sample, collected using the CMS detector at the LHC, consists of 5.0 fb−1 of ...Journal Article -
Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at √sNN=2.76 TeV
(2016)Journal of High Energy PhysicsAn analysis of dijet events in PbPb and pp collisions is performed to explore the properties of energy loss by partons traveling in a quark-gluon plasma. Data are collected at a nucleon-nucleon center-of-mass energy of 2.76 TeV at the LHC. The distribution of transverse momentum (p T) surrounding dijet systems is measured by selecting charged particles in different ranges of p T and at different angular cones of pseudorapidity and azimuth. ...Journal Article -
Search for vector-like charge 2/3T quarks in proton-proton collisions at √s = 8 TeV
(2016)Physical Review DA search for fermionic top quark partners T of charge 2/3 is presented. The search is carried out in proton-proton collisions corresponding to an integrated luminosity of 19.7 fb−1 collected at a center-of-mass energy of √s=8 TeV with the CMS detector at the LHC. The T quarks are assumed to be produced strongly in pairs and can decay into tH, tZ, and bW. The search is performed in five exclusive channels: a single-lepton channel, a ...Journal Article