Measurement of the relative fraction of ttbar events produced via gluon fusion in ppbar collision at s**(1/2) = 1.96 TeV at CDF

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In this thesis we present a measurement of the relative fraction of t{bar t} events produced via gluon-fusion to the total number of t{bar t} events. Using the kinematics of the production and decay of the top and antitop quark pair, we trained a Neural Network to discriminate the gluon-fusion events. The Neural Network was then used as a template to fit for the gluon-fusion fraction in data. Using a total integrated luminosity of 955 pb{sup -1} we find {sigma}(gg{yields}t{bar t})/{sigma}(p{bar p}{yields}t{bar t}) < 0.33 at 68% confidence level and {sigma}(gg{yields}t{bar t})/{sigma}(p{bar p}{yields}t{bar t}) < 0.61 at 95% confidence level.

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114 pages

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Yamaoka, Jared Andrew October 1, 2007.

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In this thesis we present a measurement of the relative fraction of t{bar t} events produced via gluon-fusion to the total number of t{bar t} events. Using the kinematics of the production and decay of the top and antitop quark pair, we trained a Neural Network to discriminate the gluon-fusion events. The Neural Network was then used as a template to fit for the gluon-fusion fraction in data. Using a total integrated luminosity of 955 pb{sup -1} we find {sigma}(gg{yields}t{bar t})/{sigma}(p{bar p}{yields}t{bar t}) < 0.33 at 68% confidence level and {sigma}(gg{yields}t{bar t})/{sigma}(p{bar p}{yields}t{bar t}) < 0.61 at 95% confidence level.

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114 pages

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  • Report No.: FERMILAB-THESIS-2007-18
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/915127 | External Link
  • Office of Scientific & Technical Information Report Number: 915127
  • Archival Resource Key: ark:/67531/metadc889884

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 1, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 26, 2017, 1:12 p.m.

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Yamaoka, Jared Andrew. Measurement of the relative fraction of ttbar events produced via gluon fusion in ppbar collision at s**(1/2) = 1.96 TeV at CDF, thesis or dissertation, October 1, 2007; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc889884/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.