Top Quark Pair Production Cross Section at Tevatron PDF Download

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Languages : en
Pages : 4

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An overview of the recent measurements of the top antitop quark pair production cross section in proton antiproton collisions at (square root)s = 1.96 TeV in lepton + jets and dilepton final states is presented. These measurements are based on 1-2.8 fb−1 of data collected with the D0 and CDF experiments at the Fermilab Tevatron collider. The cross section is measured with a precision close to 8 % and found to be compatible with the standard model prediction. Interpretations of the cross-section measurements for charge higgs search and for top quark mass measurement are also discussed.

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Languages : en
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The top quark, discovered in 1995 by the CDF and D0 collaborations at the Tevatron proton antiproton collider at Fermilab, has undergone intense studies in the last 20 years. Currently, CDF and D0 converge on their measurements of top-antitop quark production cross sections using the full Tevatron data sample. In these proceedings, the latest results on inclusive and differential measurements of top-antitop quark production cross sections at the Tevatron are reported.

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Languages : en
Pages : 16

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Languages : en
Pages : 233

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The top quark has been discovered by CDF and D0 experiments in 1995 at the proton-antiproton collider Tevatron. The amount of data recorded by both experiments makes it possible to accurately study the properties of this quark: its mass is now known to better than 1% accuracy. This thesis describes the measurement of the top pair cross section in the electron muon channel with 4, 3 fb−1 recorded data between 2006 and 2009 by the D0 experiment. Since the final state included a muon, improvements of some aspects of its identification have been performed : a study of the contamination of the cosmic muons and a study of the quality of the muon tracks. The cross section measurement is in good agreement with the theoretical calculations and the other experimental measurements. This measurement has been used to extract a value for the top quark mass. This method allows for the extraction of a better defined top mass than direct measurements as it depends less on Monte Carlo simulations. The uncertainty on this extracted mass, dominated by the experimental one, is however larger than for direct measurements. In order to decrease this uncertainty, the ratio of the Z boson and the top pair production cross sections has been studied to look for some possible theoretical correlations. At the Tevatron, the two cross sections are not theoretically correlated: no decrease of the uncertainty on the extracted top mass is therefore possible.

Author: E. Shabalina
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Languages : en
Pages : 4

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An overview of the preliminary results of the top quark pair production cross section measurements at a center-of-mass energy of 1.96 TeV carried out by the CDF and D0 collaborations is presented. The data samples used for the analyses are collected in the current Tevatron run and correspond to an integrated luminosity from 360 pb{sup -1} up to 760 pb{sup -1}.

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Languages : en
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The top quark pair production cross-section[sigma][sub t[bar t]] has been measured in p[bar p] collisions at center of mass energies of 1.96 TeV using Tevatron Run 2 data. In the beginning of Run 2 both CDF and D0[sigma][sub t[bar t]] measurements in the dilepton channel t[bar t][yields] WbW[bar b][yields][bar[ell]][nu][sub[ell]]b[ell][prime][bar[nu]][sub[ell][prime]][bar b] and in the lepton plus jets channel t[bar t][yields] WbW[bar b][yields] q[bar q][prime] b[ell][bar[nu]][sub[ell]][bar b]+[bar[ell]][nu][sub[ell]]bq[bar q][prime][bar b] agree with the NLO (Next-to-Leading-Order) theoretical predictions. The presence of a top signal in Tevatron data has been reestablished.

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Languages : en
Pages : 4

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We present the preliminary results of the t{bar t} pair production cross-section measurements and the single top quark exclusion limits carried out by the D0 and the CDF collaborations in Run II of the Tevatron. The dataset for the various measurements ranges from 140 pb−1 to 350 pb−1.

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Languages : en
Pages : 377

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The subject of this thesis is the measurement of the rate at which a top-antitop quark pair is produced in pp collisions at a center of mass energy of ps = 1:96 TeV. The data are collected with the D detector, a multi-purpose detector operating at the Fermilab Tevatron collider during Run II. A measurement of the top quark pair (t$\bar{t}$) production cross section ( ?t$\bar{t}$) in p$\bar{p}$ collisions at a center of mass energy of 1.96 TeV is presented. The measurement is based on data recorded by the D0 Detector at the Fermilab Tevatron Collider, and preselected in the e+jets (366 pb-1) and ?+jets (363 pb-1) channels. The cross section is extracted by applying a lifetime-tagging technique to the data, and yields ?t$\bar{t}$ = 6.96$+1.07\atop{-0.98}$(stat + syst) ± 0.45(lumi) pb; for a top quark mass mt =175 GeV, in good agreement with the Standard Model prediction.

Author: Anna Christine Henrichs
Publisher: Springer Science & Business Media
ISBN: 3319014870
Category : Science
Languages : en
Pages : 231

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Before any kind of new physics discovery could be made at the LHC, a precise understanding and measurement of the Standard Model of particle physics' processes was necessary. The book provides an introduction to top quark production in the context of the Standard Model and presents two such precise measurements of the production of top quark pairs in proton-proton collisions at a center-of-mass energy of 7 TeV that were observed with the ATLAS Experiment at the LHC. The presented measurements focus on events with one charged lepton, missing transverse energy and jets. Using novel and advanced analysis techniques as well as a good understanding of the detector, they constitute the most precise measurements of the quantity at that time.

Author: Roberto Rossin
Publisher:
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Languages : en
Pages : 10

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We present the measurement of the top pair production cross-section at Tevatron in p-pbar collisions at 1.96 TeV. We also compare selected kinematical distributions with the predictions of the Standard Model. In the dilepton mode, we select events with two charged leptons, high missing transverse energy and at least 2 jets. In the lepton+jets mode, we select events with one charged lepton, high missing transverse energy and at least 3 jets. We present several complementary measurements using kinematic discrimination and/or b-tagging. In the all-hadronic channel, we select events with {ge}6 jets and {le}8 jets. We present a measurement using an optimized kinematic selection and events with one or more displaced secondary vertices. We also report on the search for non-standard model resonance states in the invariant mass spectrum of top pairs in lepton+jets events. We present two complementary measurements, one adopts an event reconstruction technique that uses matrix element information to increase the sensitivity for discovery, the other performs a constrained kinematic fit and requires b-tagging.