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| Total Pages | : 5 |
| Release | : 2010 |
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Download Top Cross Section Measurement at CDF. Book in PDF, ePub and Kindle
This paper describes the latest measurements of the t{bar t} pair production cross section performed by the CDF Collaboration analyzing p{bar p} collisions at a center-of-mass energy of 1.96 TeV from Fermilab Tevatron, as presented at the XVIII International Workshop on Deep-Inelastic Scattering and Related Subjects. In order to test Standard Model predictions, several analysis methods are explored and all the top decay channels are considered, to better constrain the properties of the top quark and to search for possible sources of new physics affecting the pair production mechanism. Experimental results using an integrated luminosity up to 5.1 fb−1 are presented.
| Author | : Daniel Wicke |
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| Total Pages | : 4 |
| Release | : 2004 |
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Download Top Pair Production Cross-section Measurement in the All-hadronic Channel at CDF and Book in PDF, ePub and Kindle
Measurements of the t{bar t} production cross-section at {radical}s = 1.96 TeV in proton-antiproton collisions were performed by the CDF and D0 collaborations using t{bar t} final states where both W's decay hadronically. Each experiment uses luminosity of about 160 pb{sup -1} of data collected during Run II of the Fermilab Tevatron collider. Beside kinematical observables both experiments take advantage of identifying b jets based on lifetime tagging. While CDF counts the number of b-tags over background after a cut based analysis, D0 counts the excess of events after a neural network based kinematical selection and requiring a b-tagged jet. CDF obtains {sigma}{sub t{bar t}} = 7.8 {+-} 2.5(stat){sub -2.3}{sup +4.7}(syst); D0 {sigma}{sub t{bar t}} = 7.7{sub -3.3}{sup +3.4}(stat){sub -3.8}{sup +4.7}(syst) {+-} 0.5(lumi).
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| Release | : 1999 |
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Download Top Mass and Cross Section Results from CDF and D0 at the Fermilab Tevatron Book in PDF, ePub and Kindle
Measurements of the top quark mass and the t{bar t} production cross section, obtained by CDF and D0 Collaborations at the Tevatron, are presented. The methodology of analyses and their underlying assumptions are summarized. The CDF and D0 top mass averages, based on H"00 pb−1 of data collected by each experiment in Run-I, and obtained from a set of selected measurements in several channels are M{sub t} = 176:0 ± 4:0(stat) ± 5:1(syst) GeV/c{sup 2} and M{sub t} = 172:1 ± 5:2(stat) ± 4:9(syst) GeV/c{sup 2}, respectively. The combined Tevatron top quark mass is M{sub t} = 174:3 ±3:2(stat) ±4:0(syst) GeV/c}sup 2}, where the correlations between CDF and D0 averages were taken into account. The CDF measurement of the t{bar t} cross section (assuming M{sub t} = 175 GeV/c{sup 2}) is [sigma]{sub tt} = 7.6{sup 1.8}{sub 1.5} pb, and the D0 value (assuming M{sub t} = 172.1 GeV/c{sup 2}) is [sigma]{sub tt} = 5:9 ± 1:7 pb. In anticipation of the much increased statistics in Run-II, the fact that top quark physics is one of the best windows to new physics beyond the Standard Model is emphasized.
| Author | : Jan Kieseler |
| Publisher | : Springer |
| Total Pages | : 172 |
| Release | : 2016-06-15 |
| Genre | : Science |
| ISBN | : 3319400053 |
Download Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass Book in PDF, ePub and Kindle
This thesis presents the first experimental calibration of the top-quark Monte-Carlo mass. It also provides the top-quark mass-independent and most precise top-quark pair production cross-section measurement to date. The most precise measurements of the top-quark mass obtain the top-quark mass parameter (Monte-Carlo mass) used in simulations, which are partially based on heuristic models. Its interpretation in terms of mass parameters used in theoretical calculations, e.g. a running or a pole mass, has been a long-standing open problem with far-reaching implications beyond particle physics, even affecting conclusions on the stability of the vacuum state of our universe. In this thesis, this problem is solved experimentally in three steps using data obtained with the compact muon solenoid (CMS) detector. The most precise top-quark pair production cross-section measurements to date are performed. The Monte-Carlo mass is determined and a new method for extracting the top-quark mass from theoretical calculations is presented. Lastly, the top-quark production cross-sections are obtained – for the first time – without residual dependence on the top-quark mass, are interpreted using theoretical calculations to determine the top-quark running- and pole mass with unprecedented precision, and are fully consistently compared with the simultaneously obtained top-quark Monte-Carlo mass.
| Author | : Cheuk-yin Wong |
| Publisher | : World Scientific |
| Total Pages | : 474 |
| Release | : 2000-04-05 |
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| ISBN | : 9814543004 |
Download Recent Advances And Cross-century Outlooks In Physics: Interplay Between Theory And Experiment Book in PDF, ePub and Kindle
| Author | : Anna Christine Henrichs |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 231 |
| Release | : 2013-10-04 |
| Genre | : Science |
| ISBN | : 3319014870 |
Download Top Quark Pair Production Book in PDF, ePub and Kindle
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.
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| Total Pages | : 135 |
| Release | : 2014 |
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Download Measurement of the $s$-channel Single Top Quark Cross Section at the CDF Experiment and Contributions to the Evidence of $H\rightarrow Bb$ at the Tevatron Book in PDF, ePub and Kindle
In this thesis, we present the measurement of the s-channel single top quark production cross section. In the cross section measurement we use data generated by protonantiproton collisions at the center-of-mass energy √s = 1.96 TeV and collected by the CDF Run II detector. The total data set corresponds to an integrated luminosity of 9.4 fb-1.
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| Total Pages | : 10 |
| Release | : 2009 |
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Download Combination of CDF and D0 Measurements of the Single Top Production Cross Section Book in PDF, ePub and Kindle
We report a combination of the CDF and D0 measurements of the inclusive single top quark production cross section in the s- and t-channels, [sigma]{sub s+t}, in p{bar p} collisions at a center of mass energy of 1.96 TeV. The total integrated luminosity included in CDF's analysis is 3.2 fb−1 and D0's analysis has 2.3 fb−1. A Bayesian analysis is used to extract the cross section from the distributions of multivariate discriminants provided by the collaborations. For a top quark mass m{sub t} = 170 GeV/c2, we measure a cross section of 2.76{sub -0.47}{sup +0.58} pb. We extract the CKM matrix element.
| Author | : S. Cabrera |
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| Total Pages | : 4 |
| Release | : 2006 |
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Download Top Quark Pair Production Cross Section Measurements in P Anti-p Collisions at S**(1/2) Book in PDF, ePub and Kindle
The CDF and D0 experiments have measured the t{bar t} production cross section in p{bar p} collisions at {radical}s = 1.96 TeV from different final states using a wide variety of techniques. CDF has combined 6 measurements using data samples with integrated luminosities up to 760 pb{sup -1}: {sigma}{sub t{bar t}} = 7.3 {+-} 0.5(stat) {+-} 0.6(syst) {+-} 0.4(lum) pb in good agreement with the theoretical calculations: 6.7 {+-} 0.8 pb for a top mass of 175 GeV/c{sup 2}. The experimental precision of the current CDF combined result is comparable for the first time to the accuracy of the QCD NLO theory: {approx} 12%.
| Author | : Arnulf Quadt |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 166 |
| Release | : 2007-08-16 |
| Genre | : Science |
| ISBN | : 3540710604 |
Download Top Quark Physics at Hadron Colliders Book in PDF, ePub and Kindle
This will be a required acquisition text for academic libraries. More than ten years after its discovery, still relatively little is known about the top quark, the heaviest known elementary particle. This extensive survey summarizes and reviews top-quark physics based on the precision measurements at the Fermilab Tevatron Collider, as well as examining in detail the sensitivity of these experiments to new physics. Finally, the author provides an overview of top quark physics at the Large Hadron Collider.
