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Measurement Of The Top Anti Top Production Cross Section At U221as
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Book Synopsis Measurement of the Top - Anti-top Production Cross Section at {u221A}s by :
Download or read book Measurement of the Top - Anti-top Production Cross Section at {u221A}s written by and published by . This book was released on 2005 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: We discuss the measurement of the cross section for t$ar{t}$ production in p$ar{p}$ collisions at √s = 1.96 TeV in e+jets final states observed at the D0 experiment at the Fermilab Tevatron. Our result is based on data collected from the June 2002 to September 2003 period of Run II of the p$ar{p}$ Collider. In the Standard Model, the top quark is expected to decay mainly into a W boson and a b quark. The W boson can decay subsequently into a lepton and its neutrino or a q$ar{q}$ quark-antiquark pair. In this thesis, we focus on the e+ ve or e- $ar{v}$e decays of one of the W bosons and the q$ar{q}$ decays of the other W boson in t$ar{t}$ final states. The b, q and q' quarks appear as jets of particles in the detector, thereby defining the e+jets final state. We present two methods used for performing this measurement. The first method is based on a Random Grid Search (RGS) that minimizes the uncertainty on the extracted cross section. The variables used in the search take advantage of differences between expected background and signal processes to obtain the yield of t$ar{t}$ events. The second method uses a Neural Network (NN) procedure that discriminates signal from background through the application of a NN trained on simulated t$ar{t}$ signal and W+jets background events. The preliminary results presented in this thesis for inclusive t$ar{t}$ production are ? p$ar{p}$ → t$ar{t}$ + x of 7.9$+2.6top{-2.4}$(stat) $+2.2top{-2.3}$(syst) ± 0.5 (L) pb for the NN analysis, where the uncertainties correspond to contributions from statistical and systematic sources and from the uncertainty on luminosity. Our measurements are consistent with each other, and are within error of the value of 6.77 ± 0.42 pb expected in the Standard Model.
Book Synopsis Measurements of the Top - Anti-top Production Cross Section at S**(1/2) by : Joseph Francis Kozminski
Download or read book Measurements of the Top - Anti-top Production Cross Section at S**(1/2) written by Joseph Francis Kozminski and published by . This book was released on 2005 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first measurement of the top-antitop production cross section in proton-antiproton collisions at {radical}s = 1.96 TeV using 243 pb{sup -1} of data collected with the D0 detector at Fermilab is presented. In this analysis, only the dielectron final state is considered. Five events are observed, and 0.93 background events are expected. The measured cross section, after accounting for the expected branching ratio to the dielectron channel, is {sigma}{sub t{bar t}} = 14.9{sub -7.0}{sup +9.4}(stat){sub -1.8}{sup +2.5}(syst) {+-} 1.0 (lumi) pb, which agrees with the predicted cross section for top quarks with a mass of 175 GeV. In addition, a first-pass at a measurement of the top mass using the neutrino-weighting method is presented. This measurement is also performed in the dielectron channel using the five events observed in the cross section measurement.
Book Synopsis Measurement of the Top - Anti-top Production Cross Section at S**(/1/2) by : DooKee Cho
Download or read book Measurement of the Top - Anti-top Production Cross Section at S**(/1/2) written by DooKee Cho and published by . This book was released on 2005 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: We discuss the measurement of the cross section for t{bar t} production in p{bar p} collisions at {radical}s = 1.96 TeV in e+jets final states observed at the D0 experiment at the Fermilab Tevatron. Our result is based on data collected from the June 2002 to September 2003 period of Run II of the p{bar p} Collider. In the Standard Model, the top quark is expected to decay mainly into a W boson and a b quark. The W boson can decay subsequently into a lepton and its neutrino or a q{bar q} quark-antiquark pair. In this thesis, we focus on the e{sup +} {nu}{sub e} or e{sup -} {bar {nu}}{sub e} decays of one of the W bosons and the q{bar q} decays of the other W boson in t{bar t} final states. The b, q and q' quarks appear as jets of particles in the detector, thereby defining the e+jets final state. We present two methods used for performing this measurement. The first method is based on a Random Grid Search (RGS) that minimizes the uncertainty on the extracted cross section. The variables used in the search take advantage of differences between expected background and signal processes to obtain the yield of t{bar t} events. The second method uses a Neural Network (NN) procedure that discriminates signal from background through the application of a NN trained on simulated t{bar t} signal and W+jets background events. The preliminary results presented in this thesis for inclusive t{bar t} production are {sigma}{sub p{bar p} {yields} t{bar t} + x} of 7.9{sub -2.4}{sup +2.6}(stat) {sub -2.3}{sup +2.2}(syst) {+-} 0.5 (L) pb for the NN analysis, where the uncertainties correspond to contributions from statistical and systematic sources and from the uncertainty on luminosity. Our measurements are consistent with each other, and are within error of the value of 6.77 {+-} 0.42 pb expected in the Standard Model.
Book Synopsis Measurements of the Top - Anti-top Production Cross Section at S**(1/2) by :
Download or read book Measurements of the Top - Anti-top Production Cross Section at S**(1/2) written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Not Provided.
Book Synopsis Measurement of the Top-antitop Production Cross Section in Pp Collisions at Sqrt(s) by :
Download or read book Measurement of the Top-antitop Production Cross Section in Pp Collisions at Sqrt(s) written by and published by . This book was released on 2011 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the top-antitop production cross section in proton-proton collisions at a centre-of-mass energy of 7 TeV has been performed at the LHC with the CMS detector. The analysis uses a data sample corresponding to an integrated luminosity of 36 inverse picobarns and is based on the reconstruction of the final state with one isolated, high transverse-momentum electron or muon and three or more hadronic jets. The kinematic properties of the events are used to separate the top-antitop signal from W+jets and QCD multijet background events. The measured cross section is 173 + 39 - 32 (stat. + syst.) pb, consistent with standard model expectations.
Book Synopsis Measurement of the Top-antitop and Z0-boson Production Cross Sections and Their Ratio in the Dileptonic Decay Channels at S by : Jan Kieseler
Download or read book Measurement of the Top-antitop and Z0-boson Production Cross Sections and Their Ratio in the Dileptonic Decay Channels at S written by Jan Kieseler and published by . This book was released on 2012 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Top-antitop Cross Section Measurement as a Function of the Jet Multiplicity in the Final State and Beyond the Standard Model Top-antitop Resonances Search at the ATLAS Detector at CERN by : Danilo Enoque Ferreira de Lima
Download or read book Top-antitop Cross Section Measurement as a Function of the Jet Multiplicity in the Final State and Beyond the Standard Model Top-antitop Resonances Search at the ATLAS Detector at CERN written by Danilo Enoque Ferreira de Lima and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the $t\bar{t}$ Production Cross Section with an in Situ Calibration of $b$-jet Identification Efficiency by :
Download or read book Measurement of the $t\bar{t}$ Production Cross Section with an in Situ Calibration of $b$-jet Identification Efficiency written by and published by . This book was released on 2010 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the top-quark pair-production cross section in p{bar p} collisions at √s = 1.96 TeV using data corresponding to an integrated luminosity of 1.12 fb−1 collected with the Collider Detector at Fermilab is presented. Decays of top-quark pairs into the final states e[nu] + jets and [mu][nu] + jets are selected, and the cross section and the b-jet identification efficiency are determined using a new measurement technique which requires that the measured cross sections with exactly one and multiple identified b-quarks from the top-quark decays agree. Assuming a top-quark mass of 175 GeV/c2, a cross section of 8.5 ± 0.6(stat.) ± 0.7(syst.) pb is measured.
Book Synopsis Measurement of the T Anti-t Production Cross Section in P Anti-p Collisions at S**(1/2) by : Salvatore Rocco Rappoccio
Download or read book Measurement of the T Anti-t Production Cross Section in P Anti-p Collisions at S**(1/2) written by Salvatore Rocco Rappoccio and published by . This book was released on 2005 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Measurement of the $t\bar{t}$ Production Cross Section in Pp Collisions at $\sqrt{s}$ by :
Download or read book Measurement of the $t\bar{t}$ Production Cross Section in Pp Collisions at $\sqrt{s}$ written by and published by . This book was released on 2014 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The top-quark pair production cross section is measured in final states with one electron or muon and one hadronically decaying [tau] lepton from the process $t\bar{t}$ to (l[nu]l) ([tau][nu][tau]) $b\bar{b}$, where l = e, [mu]. The data sample corresponds to an integrated luminosity of 19.6 fb-1 collected with the CMS detector in proton-proton collisions at $\sqrt{s}$ =8 TeV. The measured cross section [sigma]$t\bar{t}$ = 257 ± 3 (stat) ± 24 (syst) ± 7 (lumi) pb, assuming a top-quark mass of 172.5 GeV, is consistent with the standard model prediction.
Book Synopsis A Measurement of the T $\bar{t}$ Production Cross Section in P $\bar{p}$ Collisions at {u221A}s by :
Download or read book A Measurement of the T $\bar{t}$ Production Cross Section in P $\bar{p}$ Collisions at {u221A}s written by and published by . This book was released on 2008 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: I present a measurement of the t$ar{t}$ 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$ar{t}$ 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$+0.9top{-0.8}$ ± 0.6 pb, in agreement with the Standard Model.
Book Synopsis Measurement of the T Anti-t Production Cross Section in P Anti-p Collisions at S**1/2 by :
Download or read book Measurement of the T Anti-t Production Cross Section in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2006 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Measurement of the T Anti-t Production Cross Section in P Anti-p Collisions at S**ư by :
Download or read book Measurement of the T Anti-t Production Cross Section in P Anti-p Collisions at S**ư written by and published by . This book was released on 2006 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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?{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.
Book Synopsis Measurement of Differential T(t)over-bar Production Cross Sections Using Top Quarks at Large Transverse Momenta in Pp Collisions at Root S by : Albert M. Sirunyan
Download or read book Measurement of Differential T(t)over-bar Production Cross Sections Using Top Quarks at Large Transverse Momenta in Pp Collisions at Root S written by Albert M. Sirunyan and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Differential Top Pair Production Cross-section Measurements at √s by : Ian James Watson
Download or read book Differential Top Pair Production Cross-section Measurements at √s written by Ian James Watson and published by . This book was released on 2014 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the T Anti-t Cross-Section Using the Dimuon Channel in P Anti-p Collisions at S**(1/2) by : Robert Crampton McCroskey
Download or read book Measurement of the T Anti-t Cross-Section Using the Dimuon Channel in P Anti-p Collisions at S**(1/2) written by Robert Crampton McCroskey and published by . This book was released on 2004 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author has 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.
