T Anti T Production Cross Section Measurement Using Soft Electron Tagging In P Anti P Collisions At U221a S
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T Anti T Production Cross Section Measurement Using Soft Electron Tagging In P Anti P Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2008
T Anti T Production Cross Section Measurement Using Soft Electron Tagging In P Anti P Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
We measure the production cross section of t$ar{t}$ events in p$ar{p}$ collisions at √s = 1.96 TeV. The data was collected by the CDF experiment in Run 2 of the Tevatron accelerator at the Fermi National Accelerator Laboratory between 2002 and 2007. 1.7 fb-1 of data was recorded during this time period. We reconstruct t$ar{t}$ events in the lepton+jets channel, whereby one W boson - resulting from the decay of the top quark pairs - decays leptonically and the other hadronically. The dominant background to this process is the production of W bosons in association with multiple jets. To distinguish t$ar{t}$ from background, we identify soft electrons from the semileptonic decay of heavy flavor jets produced in t$ar{t}$ events. We measure a cross section of ?$ar{p}$ = 7.8 ± 2.4(stat) ± 1.6(syst) ± 0.5(lumi).
T Anti T Production Cross Section Measurement Using Soft Electron Tagging In P Anti P Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2008
T Anti T Production Cross Section Measurement Using Soft Electron Tagging In P Anti P Collisions At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
We measure the production cross section of t{bar t} events in p{bar p} collisions at √s = 1.96 TeV. The data was collected by the CDF experiment in Run 2 of the Tevatron accelerator at the Fermi National Accelerator Laboratory between 2002 and 2007. 1.7 fb−1 of data was recorded during this time period. We reconstruct t{bar t} events in the lepton+jets channel, whereby one W boson - resulting from the decay of the top quark pairs - decays leptonically and the other hadronically. The dominant background to this process is the production of W bosons in association with multiple jets. To distinguish t{bar t} from background, we identify soft electrons from the semileptonic decay of heavy flavor jets produced in t{bar t} events. We measure a cross section of [sigma]{sub p{bar p}} = 7.8 ± 2.4(stat) ± 1.6(syst) ± 0.5(lumi).
Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2004
Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
The direct observation of the top quark was first achieved at the Tevatron proton anti-proton collider at Fermilab. This discovery completed the third generation quark sector where the top quark is expected to accompany the bottom quark in the weak isospin doublet. This dissertation discusses the experimental verification of the production cross section as predicted by the Standard Model. A measurement of the t$ar{t}$ production cross section using 107.9 pb-1 of p$ar{p}$ collisions at √s = 1.96 TeV collected with the Collider Detector at Fermilab between March of 2003 and June of 2003 is presented. The measurement focuses on the t$ar{t}$ production in the ''lepton plus jets'' final state in which one of the W bosons from the t$ar{t}$ decay subsequently decays leptonically to an electron or a muon, and the other decays hadronically. The B-tagging technique which utilizes the precision silicon detector tracking is used to enhance the signal for t$ar{t}$ events relative to the background through identification of the bottom quark from its measurable lifetime. The t$ar{t}$ production cross section is measured to be ?t$ar{t}$ = 4.5 ± 1.4(stat) ± 0.8(sys) pb.
Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S
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Author :
language : en
Publisher:
Release Date : 2006
Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
We report a new measurement of the t{bar t} production cross section in p{bar p} collisions at a center-of-mass energy of 1.96 TeV using events with one charged lepton (electron or muon), missing transverse energy, and jets. Using 425 pb−1 of data collected using the D0 detector at the Fermilab Tevatron Collider, and enhancing the t{bar t} content of the sample by tagging b jets with a secondary vertex tagging algorithm, the t{bar t} production cross section is measured to be:?{sub p{bar p} → t{bar t}+X} = 6.6 ± 0.9(stat + syst) ± 0.4(lum) pb. This cross section is the most precise D0 measurement to date for t{bar t} production and is in good agreement with standard model expectations.
Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2006
Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
We report a new measurement of the t{bar t} production cross section in p{bar p} collisions at a center-of-mass energy of 1.96 TeV using events with one charged lepton (electron or muon), missing transverse energy, and jets. Using 425 pb−1 of data collected using the D0 detector at the Fermilab Tevatron Collider, and enhancing the t{bar t} content of the sample by tagging b jets with a secondary vertex tagging algorithm, the t{bar t} production cross section is measured to be: [sigma]{sub p{bar p} → t{bar t}+X} = 6.6 ± 0.9(stat + syst) ± 0.4(lum) pb. This cross section is the most precise D0 measurement to date for t{bar t} production and is in good agreement with standard model expectations.
Measurement Of The T Bar T Production Cross Section In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of The T Bar T Production Cross Section In P Bar P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
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.
A Measurement Of The T Anti T Production Cross Section In Proton Anti Proton Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2004
A Measurement Of The T Anti T Production Cross Section In Proton Anti Proton Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
A preliminary measurement of the t$ar{t}$ production cross section at √s = 1.96 TeV is presented. The ?-plus-jets final state is analyzed in a data sample of 94 pb-1 and a total of 14 events are selected with a background expectation of 11.7 ± 1.9 events. The measurement yields: ?p$ar{p}$ → t$ar{t}$ + X} = 2.4$+4.2top{-3.5}$(stat.)$+2.5top{-2.6}$(syst.) ± 0.3(lumi.) pb. The analysis, being part of a larger effort to re-observe the top quark in Tevatron Run II data and to measure the production cross section, is combined with results from all available analyses channels. The combined result yields: ? p$ar{p}$ → t$ar{t}$ + X = 8.1$+2.2top{-2.0}$(stat.)$+1.6top{-1.4}$(syst.) ± 0.8(lumi.) pb.
Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S 1 2
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Author : Salvatore Rocco Rappoccio
language : en
Publisher:
Release Date : 2005
Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S 1 2 written by Salvatore Rocco Rappoccio and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
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.
Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S 1 2
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Author : Heather Lynn Ray
language : en
Publisher:
Release Date : 2004
Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S 1 2 written by Heather Lynn Ray and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
The direct observation of the top quark was first achieved at the Tevatron proton anti-proton collider at Fermilab. This discovery completed the third generation quark sector where the top quark is expected to accompany the bottom quark in the weak isospin doublet. This dissertation discusses the experimental verification of the production cross section as predicted by the Standard Model. A measurement of the t{bar t} production cross section using 107.9 pb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV collected with the Collider Detector at Fermilab between March of 2003 and June of 2003 is presented. The measurement focuses on the t{bar t} production in the ''lepton plus jets'' final state in which one of the W bosons from the t{bar t} decay subsequently decays leptonically to an electron or a muon, and the other decays hadronically. The B-tagging technique which utilizes the precision silicon detector tracking is used to enhance the signal for t{bar t} events relative to the background through identification of the bottom quark from its measurable lifetime. The t{bar t} production cross section is measured to be {sigma}{sub t{bar t}} = 4.5 {+-} 1.4(stat) {+-} 0.8(sys) pb.
A Measurement Of The T Anti T Cross Section In P Anti P Collisions At S
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Author :
language : en
Publisher:
Release Date : 2009
A Measurement Of The T Anti T Cross Section In P Anti P Collisions At S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
This paper reports a measurement of the cross section for the pair production of top quarks in p{bar p} collisions at √s = 1.96 TeV at the Fermilab Tevatron. The data was collected from the CDF II detector in a set of runs with a total integrated luminosity of 1.1 fb−1. The cross section is measured in the dilepton channel, the subset of t{bar t} events in which both top quarks decay through t → Wb → l?b, where l = e,?, or?. The lepton pair is reconstructed as one identified electron or muon and one isolated track. The use of an isolated track to identify the second lepton increases the t{bar t} acceptance, particularly for the case in which one W decays as W →??. The purity of the sample may be further improved at the cost of a reduction in the number of signal events, by requiring an identified b-jet. They present the results of measurements performed with and without the request of an identified b-jet. the former is the first published CDF result for which a b-jet requirement is added to the dilepton selection. In the CDF data there are 129 pretag lepton + track candidate events, of which 69 are tagged. With the tagging information, the sample is divided into tagged and untagged sub-samples, and a combined cross section is calculated by maximizing a likelihood. The result is?{sub t{bar t}} = 9.6 ± 1.2(stat.){sub -0.5}{sup +0.6}(sys.) ± 0.6(lum.) pb, assuming a branching ratio of BR(W → l?) = 10.8% and a top mass of m{sub t} = 175 GeV/c2.