[PDF] Top 20 Measurement of the differential cross sections for top quark pair production as a function of kinematic event variables in pp collisions at $\sqrt s$=7 and 8 TeV

... colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and ... See full document

... around the interaction ...reconstructed in the inner detector, which comprises a silicon pixel detector, a silicon microstrip detector and a transition radiation ...tracker. The ... See full document

... After the subtraction of the backgrounds, an unfolding procedure is used to correct the re- constructed distributions for detector-specific effects, ...efficiency and resolutions, ... See full document

... match the conditions observed in ...reproduce the distribution of the number of primary vertices that arises from additional pp interactions within the same or ... See full document

... Since the discovery of heavy-quark bound states, quarkonium production in hadronic collisions has been the subject of many theoretical and experimental ... See full document

... particle-flow event algorithm [22,23] is used to reconstruct and identify each individual particle with an optimized combination of information from the various elements of the ... See full document

... [54] and one muon [55] of opposite charge, both of which are required to have p T > 20 GeV and jηj < ...region of jηj between the barrel and endcap sections ... See full document

... using the Powheg-Box [ 17 ] generator, based on next-to-leading- order QCD matrix ...elements. The CT10 [ 18 ] parton distribution functions are employed and the top-quark mass ... See full document

... using kinematic requirements on the final state ...backgrounds and verify that the dilep- ton final states are accompanied by b-quark jets, a sepa- rate measurement is performed ... See full document

... conditions, and requiring all subdetectors to be operational. Each selected event includes additional interactions from, on average, 14 inelastic pp collisions in the same proton ... See full document

... by the ATLAS [ 3 – 7 ] and CMS [ 8 – 11 ] ...Collaborations. The high centre-of-mass proton–proton (pp) collision energy of 13 TeV at the LHC, ... See full document

... for the top quark charge measurement in the lepton + jets channel are: W + jets production (the most significant background), Z+ jets, multi-jet, diboson and ... See full document

... using event samples collected with triggers specifically designed for this purpose, including a sample enriched in dimuons from J/ψ decays where a muon is combined with an- other track and the ... See full document

... restart in 2015, the Large Hadron Collider (LHC) [ 1 ] has been producing proton–proton (pp) collisions at a centre-of-mass energy of √ s = 13 TeV, giving ... See full document

... b-hadron production cross-section has been predicted with next-to-leading-order (NLO) accuracy for more than twenty years [ 1 , 2 ] and more recently it has been predicted with fixed order plus ... See full document

... [62]. The ggH process is generated using the NLO Higgs characterization model [65], with effective coupling of the Higgs boson to gluons in the infinite top quark ... See full document

... appeared in 2% of pseudo-experiments in the seventh bin and in 7% for the last ...bin. The expected effect is thus only a few per cent decorrelation ... See full document

... with at least one primary vertex reconstructed from at least four tracks, with the longitudinal (radial) distance of less than 24 (2) cm from the centre of the detector, ... See full document

... jet and the lepton are required to have electric charges of opposite sign ...(OS). At least one of the jets is required to be identified as originating from b quark ... See full document

... Understanding the production and properties of top quarks is fundamental for testing the qual- ity of the standard model (SM) and for searching for new ... See full document