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![Measurement of the T[bar T] Cross Section At[radical] PDF](https://books.google.com/books/content/images/frontcover/eOvujwEACAAJ?fife=w150-h200)
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Languages : en
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A measurement of the t[bar t] cross section at[radical]s= 1.96 TeV is carried out on data samples of[approx]40 pb[sup -1] in dilepton channels (e[mu], ee and[mu][mu]) and lepton+jets channels using two complementary approaches: a fully topological analysis and a soft-muon-tag. Overall, 17 events are observed with an expected background of 6.5[+-] 0.6. This excess corresponds to an observation probability of three standard deviations and the measured t[bar t] cross section is:[sigma][sub p][bar p][yields] t[bar t]= 8.5[sub -3.6][sup+4.5] (stat)[sub -3.5][sup+6.3] (sys)[+-] 0.8 (lumi) pb.
![Measurement of the T[bar T] Cross Section At[radical] PDF](https://books.google.com/books/content/images/frontcover/eOvujwEACAAJ?fife=w80-h100)
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Languages : en
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A measurement of the t[bar t] cross section at[radical]s= 1.96 TeV is carried out on data samples of[approx]40 pb[sup -1] in dilepton channels (e[mu], ee and[mu][mu]) and lepton+jets channels using two complementary approaches: a fully topological analysis and a soft-muon-tag. Overall, 17 events are observed with an expected background of 6.5[+-] 0.6. This excess corresponds to an observation probability of three standard deviations and the measured t[bar t] cross section is:[sigma][sub p][bar p][yields] t[bar t]= 8.5[sub -3.6][sup+4.5] (stat)[sub -3.5][sup+6.3] (sys)[+-] 0.8 (lumi) pb.
Author: Zhengxiang Chen
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Category : China
Languages : en
Pages : 72
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Languages : en
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The authors have measured the t[bar t] production cross section at [radical]s = 1.96 TeV using data collected by the D0 experiment at Fermilab. The integrated luminosity of the data set is 140 pb[sup -1] and a total of four candidate events are seen, with an expected background of 2.61 events. The measured cross section of [sigma][sub t[bar t]] = 11.1[sub -9.3][sup +22.1](stat.)[sub -4.5][sup +4.3](sys.) pb is in agreement with a NNLO calculation of 6.77 pb.
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Languages : en
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A measurement of the t[bar t] production cross section in the lepton+jets channels with the D0 detector at [radical]s = 1.96 TeV using the lifetime-tagging techniques is presented. The t[bar t] cross section is estimated from the combination of the e+jets and [mu]+jets channels. The obtained result [sigma][sub tt][sup -] = 7.47 [sub -1.14][sup +1.22](stat)[sub -1.03][sup +1.65](syst) [+-] 0.49 (lumi) pb is consistent with the Standard Model expectation.
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Languages : en
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We report on the results from the analyses of[ital t][ital[anti t]] decays in[ital dilepton] and[ital lepton+jets] modes with[approx]100 pb[sup -1] of[ital p][ital[anti p]] Collider data at[radical]s= 1.8 TeV collected by the D[null] experiment at the Fermilab Tevatron. We have observed 37[ital t][ital[anti t]] candidate events while the estimated background is 13.4[+-] 3.0 events. The[ital t][ital[anti t]] production cross section has been measured to be 5.2[+-] 1.8 pb at a top quark mass of 170 GeV/c[sup 2].
![Measurement of the T[bar T] Production Cross Section at the Tevatron PDF](https://books.google.com/books/content/images/frontcover/CTP6jwEACAAJ?fife=w80-h100)
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Languages : en
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We report on the measurement of the t[anti t] production cross section obtained by CDF and D0 experiments with p[anti p] collisions at[radical]s=1. 8 TeV. The analyses presented here refer to[integral] Ldt[approx]11O pb[sup -1] collected at the Fermilab Tevatron collider during the run 1992-96. About 85% of the possible t[anti t] decays have been studied in different channels classified according to the number of high P[sub T] leptons found in the final state. The production cross section has been measured in each individual channel and then combined into a single value for each experiment, which is[sigma][sub tt]= 7.5[sup 1.9][sub 1.6] pb for CDF and[sigma][sub tt]= 5.77[+-] 1.76 pb for D0.
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Category : Aeronautics
Languages : en
Pages : 692
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Category : Science
Languages : en
Pages : 1268
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Category :
Languages : en
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![Measurement of W and Z Production Cross-sections in P[bar P] Collisions at [radical] PDF](https://books.google.com/books/content/images/frontcover/AT8GkAEACAAJ?fife=w80-h100)
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The cross sections for W and Z production in p[bar p] collisions at [radical]s = 1.8 TeV are measured using the D0 detector at the Fermilab Tevatron collider. The detected final states are W [yields] ev[sub e], Z [yields] e[sup +]e[sup [minus]], W [yields] [mu]v[sub [mu]], and Z [yields] [mu][sup +][mu][sup [minus]]. In the ratio of these measurements, many common sources of systematic error cancel and we measure R = [sigma], (p[bar p] [yields] W) [center-dot] Br(W [yields] lv)/ [sigma], (p[bar p] [yields] Z) [center-dot] Br(Z [yields] l[sup +]l[sup [minus]]). Assuming standard model couplings, this result is used to determine the width of the W bosom and to set a limit on the decay W[sup +] [yields] t[bar b].
