[PDF] Top 20 Top quark pair properties using the ATLAS detector at the LHC

... the top quark ( t ) ages, nowadays, twenty years, however, many of its properties are yet to fully constrained by the ...The top quark possesses a Yukawa coupling to the Higgs boson of ... See full document

... three properties (mass, charge and polarisation) of the top quark in t¯ t de- cays with the ATLAS detector [1] are ...the LHC comes mainly from gluon-gluon fusion. Each ... See full document

... The fake lepton background consists of semi-leptonic t ¯ t, s-channel and t-channel single top, W +jets and light- and heavy-flavour jet production. The contribution from this back- ground is small (less than 10% ... See full document

... This paper presents the measurements of coupling properties of the observed new particle under several benchmark scenarios. The measured observables are de- viations of the couplings from those predicted for a SM ... See full document

... t¯t pair decays into light quarks which subse- quently hadronize into jets, while the other W boson de- cays to an electron, muon, or leptonically-decaying tau lepton together with the corresponding ... See full document

... Figure 5. Distributions of (a) the most discriminating variable used in BDT classifier, the |Δφ| between the leading b-tagged jet and the top-quark candidate reconstructed with the sub-leading b-tagged jet ... See full document

... observables for the combined electron and muon selections at detector level are shown in figure 2. A fair agreement between the measurement and the predictions over a wide kinematic range is to be found. However, ... See full document

... the properties of the top quark using the ATLAS experiment are ...The top quark mass is one of the fundamental parameters of the Standard ...measurement using the ... See full document

... identified using a b-tagging algorithm with an efficiency of ...hadronic top-quark decays is formed by requiring at least three additional jets and zero additional isolated leptons, and a ‘Lep’ region ... See full document

... momentum, using an in- tegrated luminosity of 4.7 fb −1 recorded by the ATLAS experiment in pp collisions at a centre-of-mass energy of √ s = 7 TeV at the ... See full document

... Top pair production at hadron colliders is expected to be symmetric at leading order, under exchange of the top and antitop ...While top pair production via gluon-gluon fusion is ... See full document

... The top quark is unique among the known quarks in that it decays before it has an opportunity to form hadronic bound ...its properties particularly interesting as one can access directly the ... See full document

... single top-quark production in the t-channel with the ATLAS detector in pp collisions at √ s=7 and 8 ...single top-quark events in the Wt production mode in the dileptonic decay ... See full document

... We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, ... See full document

... The mis-modelling of lepton trigger, reconstruction and selection efficiencies in simulation was corrected for by scale factors derived from auxiliary measurements of the processes Z → µµ and Z → ee [50, 51]. The ... See full document

... the detector with a centre-of-mass energy of 7 TeV dur- ing 2011 ...The detector is comprised of three sub-detector ...the detector, the inner detector, consists of several pixel layers ... See full document

... multipurpose detector [17] that provides nearly full solid angle coverage around the interaction ...inner detector, which comprises a silicon pixel detector, a silicon microstrip detector and ... See full document

... The top quark is known to be the heaviest particle in the Standard Model (SM) of elementary particle physics, more than 20 years after it has been discovered at the Tevatron in 1995 [1, ...the top ... See full document

... the top quark production and decay. While top quark pairs are produced through strong interaction (at LHC they are produced mainly via gluon fusion), the top quark decays ... See full document

... ton pair with dilepton invariant mass within 10 GeV of the Z mass are ...lepton pair into two categories, re- ferred to respectively as the Z -enriched and Z-depleted ... See full document