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Title Search for Admixture of Scalar Top in the ttbar Lepton+Jets Final State at s**(1/2) = 1.96 TeV
Creator/Author Park, Su-Jung ; /Rochester U.
Publication Date2007 Dec 01
OSTI IdentifierOSTI ID: 921978
Report Number(s)FERMILAB-THESIS-2007-45
DOE Contract NumberAC02-76CH03000
Other Number(s)TRN: US200803%%331
Resource TypeThesis/Dissertation
Research OrgFermi National Accelerator Laboratory (FNAL), Batavia, IL
Sponsoring OrgUSDOE
Subject72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; APPROXIMATIONS; CROSS SECTIONS; DECAY; PAIR PRODUCTION; QUANTUM CHROMODYNAMICS; QUARKS; SCALARS; STANDARD MODEL
Related SubjectExperiment-HEP
Description/Abstract 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).
Country of PublicationUnited States
LanguageEnglish
FormatSize: 215 pages
System Entry Date2008 May 15
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