Abstract
In this talk, several measurements in the top-quark sector are presented, ob- tained from the CMS data collected in 2011 and 2012 at centre-of-mass energies of 7 and 8 TeV. The production cross section of tpairs is measured in several decay channels: lep- ton+jets, dilepton and fully hadronic channels, including channels with the τ lepton. Dif- ferential cross sections are measured and are provided as a function of various kinematic observables; the results are compared with precise theory calculations. Measurements of several top-quark properties are reported, including the top pair charge asymmetry, the W helicity in top decays, the measurement of the production of t¯ t pairs with W, Z, gamma, the spin correlation and the search for anomalous couplings and flavor-changing neutral currents. The results are compared with predictions from the standard model as well as new physics models. The cross sections for the electroweak production of single top quarks are measured in the t-channel and in association with W-bosons. Measurements of top-quark properties in single top quark production are also presented. The results include the W-helicity in top quark decays and the searches for the s-channel production and anomalous couplings.
Highlights
The top quark has a peculiar place in the Standard Model (SM) of particle physics
The results are compared with predictions from the standard model as well as new physics models
The cross sections for the electroweak production of single top quarks are measured in the t-channel and in association with W-bosons
Summary
The top quark has a peculiar place in the Standard Model (SM) of particle physics. It is the heaviest elementary particle known to date, its mass being very close to the scale of electroweak symmetry breaking. As such it plays a special role in many models of new physics (NP) beyond the SM. At the CERN Large Hadron Collider (LHC), the main production mechanism of top quarks is ttpair production, via the strong interaction: the total cross-section is around 250 pb at a center-of-mass energy of 8 TeV and 172 pb at 7 TeV, at the NLO. CMS has a very rich program of measurements of top-quark properties: a selection of recent results was reported in this talk
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