A measurement of the top pair production cross-section in the dilepton channel using lepton plus track selection

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Using 1.1 fb{sup -1} of data collected by the Collider Detector at Fermilab (CDF) from Run II of the Fermilab Tevatron, they measure the t{bar t} production cross section in events with two leptons, significant missing transverse energy, and {ge} 2 jets. As the Run II dataset grows, more stringent tests of Standard Model predictions for the top quark sector are becoming possible. The dilepton channel, where both top quarks decay t {yields} Wb {yields} {ell}{nu}b, is of particular interest due to its high purity even in the absence of a b jet 'tagging' requirement. Use of an isolated track ... continued below

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214 pages

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Mills, Corrinne Elaine & /UC, Santa Barbara June 1, 2007.

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Description

Using 1.1 fb{sup -1} of data collected by the Collider Detector at Fermilab (CDF) from Run II of the Fermilab Tevatron, they measure the t{bar t} production cross section in events with two leptons, significant missing transverse energy, and {ge} 2 jets. As the Run II dataset grows, more stringent tests of Standard Model predictions for the top quark sector are becoming possible. The dilepton channel, where both top quarks decay t {yields} Wb {yields} {ell}{nu}b, is of particular interest due to its high purity even in the absence of a b jet 'tagging' requirement. Use of an isolated track as the second lepton significant increases the dilepton acceptance, at the price of some increase in background, particular from W + jets events where one of the jets is identified as a lepton. With the amount of data available, it has been possible to improve the estimate of the contribution from that background, reflected in a reduced systematic uncertainty. Assuming a branching ratio of BR(W {yields} {ell}{nu}) = 10.8% and a top mass of m{sub t} = 175 GeV/c{sup 2}, the measured cross-section is {sigma}(p{bar p} {yields} t{bar t}) = 8.3 {+-} 1.3(stat.) {+-} 0.7(syst.) {+-} 0.5(lumi.) pb. The result is consistent with the Standard Model prediction of 6.7{sub -0.9}{sup +0.7} pb and represents a significant improvement in precision over previous results using this selection.

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214 pages

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  • Report No.: FERMILAB-THESIS-2007-49
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/923064 | External Link
  • Office of Scientific & Technical Information Report Number: 923064
  • Archival Resource Key: ark:/67531/metadc897855

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  • June 1, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 29, 2016, 7:45 p.m.

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Mills, Corrinne Elaine & /UC, Santa Barbara. A measurement of the top pair production cross-section in the dilepton channel using lepton plus track selection, thesis or dissertation, June 1, 2007; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc897855/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.