Abstract
A new measurement of the inclusive production cross section for pp to t t-bar is performed at a center-of-mass energy of 7 TeV using data collected by the CMS experiment at the LHC. The analysis uses a data sample corresponding to an integrated luminosity of 36 inverse picobarns, and is based on the final state with one isolated, high transverse momentum muon or electron, missing transverse energy, and hadronic jets. The ttbar content of the selected events is enhanced by requiring the presence of at least one jet consistent with b-quark hadronization. The measured cross section is 150 +/- 9 (stat.) +/- 17 syst.) +/- 6 (lumi.) pb and is in agreement with higher-order QCD calculations. The combination of this measurement with a previous CMS result based on dileptons gives 154 +/- 17 (stat.+syst.) +/- 6 (lumi.) pb.
Highlights
ColTlihseiontospatqupaffisrffi k1⁄4w1a:s8 first TeV observed in proton-antiproton at the Fermilab Tevatron collider [1,2]
This paper focuses on the study of the tt" final state, for which the production cross section has been calculated in next-to-leading-order (NLO) and approximate next-tonext-to-leading-order (NNLO) quantum chromodynamics (QCD) [5,6,7]
We focus on the tt" decays in which one of the two W bosons decays hadronically and the other decays leptonically, giving a final state containing an electron or muon, a neutrino, and four jets, two of which come from the hadronization of b quarks
Summary
ColTlihseiontospatqupaffisrffi k1⁄4w1a:s8 first TeV observed in proton-antiproton at the Fermilab Tevatron collider [1,2]. We present the results of tt" cross section measurements in the muon and electron þ jets channels using the subset of the data in which at least one jet has been b tagged using a displaced secondary vertex algorithm. This allows for the correct treatment of their correlations and the evaluation of the combined uncertainty These results complement the CMS dilepton and kinematics-based lepton þ jets analyses which are described elsewhere [9,10]. Several cross-check analyses are performed, which use different analysis techniques (a fit without the use of the profile likelihood, and two measurements based on simple cuts), and different b-tag algorithms (one based on a track impact parameter, and another that uses soft muons).
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