Measurement of the Tanti-t Production Cross Section in P Anti-ptnipbar Collisions at S**ư PDF Download
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Languages : en
Pages : 7
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The authors present a measurement of the top quark pair production cross section in p{bar p} collisions at √s = 1.96 TeV using 318 pb−1 of data collected with the Collider Detector at Fermilab. They select t{bar t} decays into the final states e? + jets and?? + jets, in which at least one b quark from the t-quark decays is identified using a secondary vertex-finding algorithm. Assuming a top quark mass of 178 GeV/c2, they measure a cross section of 8.7 ± 0.9(stat.){sub -0.9}{sup +1.1}(syst.) pb. They also report the first observation of t{bar t} with significance greater than 5? in the subsample in which both b quarks are identified, corresponding to a cross section of 10.1{sub -1.4}{sup +1.6}(stat.){sub -1.3}{sup +2.0}(syst.) pb.
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Languages : en
Pages : 7
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Book Description
The authors present a measurement of the top quark pair production cross section in p{bar p} collisions at √s = 1.96 TeV using 318 pb−1 of data collected with the Collider Detector at Fermilab. They select t{bar t} decays into the final states e? + jets and?? + jets, in which at least one b quark from the t-quark decays is identified using a secondary vertex-finding algorithm. Assuming a top quark mass of 178 GeV/c2, they measure a cross section of 8.7 ± 0.9(stat.){sub -0.9}{sup +1.1}(syst.) pb. They also report the first observation of t{bar t} with significance greater than 5? in the subsample in which both b quarks are identified, corresponding to a cross section of 10.1{sub -1.4}{sup +1.6}(stat.){sub -1.3}{sup +2.0}(syst.) pb.
Author:
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Category :
Languages : en
Pages : 7
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Book Description
The authors present a measurement of the top quark pair production cross section in p{bar p} collisions at √s = 1.96 TeV using 318 pb−1 of data collected with the Collider Detector at Fermilab. They select t{bar t} decays into the final states e[nu] + jets and [mu][nu] + jets, in which at least one b quark from the t-quark decays is identified using a secondary vertex-finding algorithm. Assuming a top quark mass of 178 GeV/c2, they measure a cross section of 8.7 ± 0.9(stat.){sub -0.9}{sup +1.1}(syst.) pb. They also report the first observation of t{bar t} with significance greater than 5[sigma] in the subsample in which both b quarks are identified, corresponding to a cross section of 10.1{sub -1.4}{sup +1.6}(stat.){sub -1.3}{sup +2.0}(syst.) pb.
Author: Salvatore Rocco Rappoccio
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Languages : en
Pages : 377
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We present the measurement of the t{bar t} cross section in the lepton plus jets channel with {ge} 1 and {ge} 2 secondary vertex tags. We use the scalar sum of transverse energies of the event (H{sub T}) to discriminate t{bar t} from the other backgrounds. We also use the transverse mass of the leptonic W-boson (M{sub T}{sup W}) to further reduce the Non-W backgrounds. We use a combination of data and Monte Carlo to estimate the backgrounds from electroweak processes, single top, fake leptons, W+ Light Flavor fake tags, and real W+ Heavy Flavor production. We obtain a value of {sigma} {sub {ge}1} = 8.7{sub -0.9}{sup +0.9}(stat){sub -0.9}{sup +1.2}(sys) pb for the {ge}1 tag cross section, and {sigma}{sub {ge}2} = 8.7{sub -1.6}{sup +1.8}(stat){sub -1.3}{sup +1.9}(sys) pb for the {ge}2 tag cross section. The authors also present a measurement of the t{bar t} cross section by fitting the N{sub jet} spectrum. They combine the =1 and {ge}2 tag cross sections to obtain {sigma}{sub t{bar t}} = 8.9{sub -0.9}{sup +0.9}(stat){sub -1.3}{sup +1.4}(syst)pb.
Author: Lucio Cerrito
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Languages : en
Pages : 4
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We present two measurements of the t{bar t} production cross section in collisions of protons and antiprotons at {radical}s = 196 TeV. We analyze a dataset of 310 {+-} 20 pb{sup -1} collected with the CDF 2 detector. In the first measurement, we select events with six to eight jets, at least one of which having a displaced secondary vertex, little or no missing transverse energy and optimized kinematical criteria consistent with the t{bar t} all-hadronic decay channel. In the second measurement, we select events with four or more jets, at least one of which having a displaced secondary vertex, high missing transverse energy, and optimized kinematical criteria consistent with the decay of t{bar t} to {tau}+jets. The averaged t{bar t} production cross section, determined from six different measurements using the CDF 2 detector in the dilepton, lepton+jets and all-hadronic decay channels, is also calculated to be {sigma}{sub t{bar t}} = 7.1 {+-} 0.6(stat) {+-} 0.7(syst) {+-} 0.4(lumi) pb, in agreement with the prediction of the standard model.
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Languages : en
Pages : 26
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Category :
Languages : en
Pages : 131
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I present a measurement of the t{bar t} production cross section at √s = 1.96 TeV using 2034 pb−1 of CDF Run II data using events with a high transverse momentum electron or muon, three or more jets, and missing transverse energy. The measurement assumes a t → Wb branching fraction of 100 percent. Events consistent with t{bar t} decay are found by identifying jets containing heavy-flavor semileptonic decays to muons. The dominant backgrounds are evaluated directly from the data. Based on 248 candidate events and an expected background of 86.8 ± 5.6 events, I measure a production cross section of 8.7 ± 1.1{sub -0.8}{sup +0.9} ± 0.6 pb, in agreement with the Standard Model.
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Languages : en
Pages : 4
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Book Description
We present two measurements of the t{bar t} production cross section in collisions of protons and antiprotons at √s = 196 TeV. We analyze a dataset of 310 ± 20 pb−1 collected with the CDF 2 detector. In the first measurement, we select events with six to eight jets, at least one of which having a displaced secondary vertex, little or no missing transverse energy and optimized kinematical criteria consistent with the t{bar t} all-hadronic decay channel. In the second measurement, we select events with four or more jets, at least one of which having a displaced secondary vertex, high missing transverse energy, and optimized kinematical criteria consistent with the decay of t{bar t} to?+jets. The averaged t{bar t} production cross section, determined from six different measurements using the CDF 2 detector in the dilepton, lepton+jets and all-hadronic decay channels, is also calculated to be?{sub t{bar t}} = 7.1 ± 0.6(stat) ± 0.7(syst) ± 0.4(lumi) pb, in agreement with the prediction of the standard model.
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Languages : en
Pages : 10
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The authors report a measurement of the t{bar t} production cross section using the CDF II detector at the Fermilab Tevatron. The analysis is performed using 311 pb−1 of p{bar p} collisions at √s = 1.96 TeV. The data consist of events selected with six or more hadronic jets with additional kinematic requirements. At least one of these jets must be identified as a b-quark jet by the reconstruction of a secondary vertex. The cross section is measured to be [sigma]{sub t{bar t}} = 7.5 ± 2.1(stat.){sub -2.2}{sup +3.3}(syst.){sub -0.4}{sup +0.5}(lumi.) pb, which is consistent with the standard model prediction.
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Languages : en
Pages :
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In this paper we report a measurement of the t{anti t} production cross section in p{anti p} collisions at √{ovr s} = 1.96 TeV using data corresponding to an integrated luminosity of 2.2 fb−1 collected with the CDF II detector at the Tevatron accelerator. We select events with significant missing transverse energy and high jet multiplicity. This measurement vetoes the presence of explicitly identified electrons and muons, thus enhancing the tau contribution of t{anti t} decays. Signal events are discriminated from the background using a neural network and heavy flavor jets are identified by a secondary-vertex tagging algorithm. We measure a t{anti t} production cross section of 7.99 ± 0.55 (stat) ± 0.76 (syst) ± 0.46 (lumi) pb, assuming a top mass m{sub top} = 172.5 GeV/c2, in agreement with previous measurements and standard model predictions.
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Category :
Languages : en
Pages : 45
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The authors present a measurement of the top pair production cross section in p{bar p} collisions at √s = 1.96 TeV. We collect a data sample with an integrated luminosity of 194 ± 11 pb−1 with the CDF II detector at the Fermilab Tevatron. We use an artificial neural network technique to discriminate between top pair production and background processes in a sample of 519 lepton + jets events, which have one isolated energetic charged lepton, large missing transverse energy and at least three energetic jets. We measure the top pair production cross section to be [sigma]{sub t{bar t}} = 6.6 ± 1.1 ± 1.5 pb, where the first uncertainty is statistical and the second is systematic.
