Search for Admixture of Scalar Top in the ttbar Lepton+Jets Final State at s**(1/2) = 1.96 TeV

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A search for pair production of scalar top (stop) quarks has been performed in the lepton+jets channel in {approx} 1 fb{sup -1} of data at the D0 experiment. Kinematic differences between {tilde t}{sub 1}{bar {tilde t}}{sub 1} and the dominant t{bar t} process are used to separate the two reactions. For stop-quark masses of 145-175 GeV, and chargino masses of 105-135 GeV, to which the stop quarks decay ({tilde t}{sub 1} {yields} {tilde {chi}}{sub 1}{sup +}b), we obtain upper limits on the {tilde t}{sub 1}{bar {tilde t}}{sub 1} cross section at 95% confidence, that are a factor of {approx} 7-12 ... continued below

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215 pages

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Park, Su-Jung & U., /Rochester December 1, 2007.

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A search for pair production of scalar top (stop) quarks has been performed in the lepton+jets channel in {approx} 1 fb{sup -1} of data at the D0 experiment. Kinematic differences between {tilde t}{sub 1}{bar {tilde t}}{sub 1} and the dominant t{bar t} process are used to separate the two reactions. For stop-quark masses of 145-175 GeV, and chargino masses of 105-135 GeV, to which the stop quarks decay ({tilde t}{sub 1} {yields} {tilde {chi}}{sub 1}{sup +}b), we obtain upper limits on the {tilde t}{sub 1}{bar {tilde t}}{sub 1} cross section at 95% confidence, that are a factor of {approx} 7-12 larger than expected from the Minimal Supersymmetric Standard Model (MSSM), as calculated in a next-to-leading-order (NLO) approximation in quantum chromodynamics (QCD).

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215 pages

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  • Report No.: FERMILAB-THESIS-2007-45
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/921978 | External Link
  • Office of Scientific & Technical Information Report Number: 921978
  • Archival Resource Key: ark:/67531/metadc897642

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Office of Scientific & Technical Information Technical Reports

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  • December 1, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 9 p.m.

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Park, Su-Jung & U., /Rochester. Search for Admixture of Scalar Top in the ttbar Lepton+Jets Final State at s**(1/2) = 1.96 TeV, thesis or dissertation, December 1, 2007; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc897642/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.