[PDF] Top 20 Measurement of the mass difference between top quark and antiquark in pp collisions at $\sqrt{s} = 8$ TeV

... on the χ 2 of a kinematic fit to the tt hypothesis described in Section 5 is also applied in the ...analysis. The number of events observed in the ... See full document

... to the t¯t event selection are classified into two types: those with two real prompt leptons from W or Z boson decays (including those produced via leptonic τ decays), and those where one of ... See full document

... from the two neutrinos in the top quark and antiquark decay ...resolve the ambiguity due to multiple algebraic solutions of the equations for ... See full document

... estimate the composition of the data sample, to de- termine and calibrate the ideograms, and to evaluate the systematic ...uncertainties. The tt sig- nal events ... See full document

... muons, and τ leptons. The best-fit signal strength and cross section, as well as an approximate 68% CL interval, are extracted following the profile likelihood scan procedure described in ... See full document

... The top quark is the heaviest particle in the standard model (SM) and the only fermion with a mass on the order of the electroweak scale ... See full document

... ] at the LHC is a multi-purpose particle detector with a forward-backward symmetric cylindrical geometry and a near 4π coverage in solid ...consists of an inner tracking detector ... See full document

... alternative measurement is performed using the KINb method [6] and a tighter event se- ...lection. The jet p T is required to be at least 35 GeV and the reconstructed E ... See full document

... source of background arises when electrons and muons are incorrectly identified as prompt and isolated (misidentified lepton ...struction of hadrons or from non-prompt or non-isolated leptons ... See full document

... to the above criteria, they can be further categorized using a b tagging discriminator variable in order to distinguish between jets stemming from the hadronization of b quarks ... See full document

... listed in Table 1 are assumed to be fully correlated among the three input ...are the uncertainties on pileup, for which we assign full correlation between the 2011 analyses but no ... See full document

... momentum of the neutrino, which are changed according to their ...resolutions. The fit is constrained to reconstruct two W bosons, each with a mass of ...GeV. In addition, ... See full document

... measures the deflection of muons in a magnetic field with a field integral from 2–8 T m, generated by one barrel and two endcap supercon- ducting air-core ...select and record ... See full document

... separately in each channel and track multiplicity bin before combin- ing them by running pseudo-experiments for each generated top quark mass point and cal- culating a linear ... See full document

... invariant mass distribution of the selected top quark candidates is fitted with three com- ponents corresponding to signal, tt and non-top-quark processes, using ... See full document

... to the beams, and the sum is over all the charged particles used to re- construct the ...vertex. The energy of photons is directly obtained from the ECAL ... See full document

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

... FAPERJ, and FAPESP (Brazil); MES (Bulgaria); NSERC, NRC, and CFI (Canada); CERN; CONICYT (Chile); CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RPF (Cyprus); ... See full document

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

... 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