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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 Date | 2007 Dec 01 |
OSTI Identifier | OSTI ID: 921978 |
Report Number(s) | FERMILAB-THESIS-2007-45 |
DOE Contract Number | AC02-76CH03000 |
Other Number(s) | TRN: US200803%%331 |
Resource Type | Thesis/Dissertation |
Research Org | Fermi National Accelerator Laboratory (FNAL), Batavia, IL |
Sponsoring Org | USDOE |
Subject | 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; APPROXIMATIONS; CROSS SECTIONS; DECAY; PAIR PRODUCTION; QUANTUM CHROMODYNAMICS; QUARKS; SCALARS; STANDARD MODEL |
Related Subject | Experiment-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 Publication | United States |
Language | English |
Format | Size: 215 pages |
System Entry Date | 2008 May 15 |
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