Search for Pair Production of Supersymmetric Top Quarks in Dilepton Events at the Tevatron

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 2010

DOI:https://doi.org/10.2172/980804· OSTI ID:980804

Johnson, William Casey ^[1]

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1. Univ. of California, Davis, CA (United States)

We search for pair production of the supersymmetric partner of the top quark, the stop quark ~$$\bar{t}$$₁, decaying to a b-quark and a chargino X^-±₁ with a subsequent X^-±₁ decay into a neutralino X^-₁ , lepton ℓ, and neutrino . Using 2.7 fb^-1 of √s = 1.96 TeV p$$\bar{p}$$ collision data collected by the CDF II experiment, we reconstruct the mass of candidate stop events and t the observed mass spectrum to a combination of standard model processes and stop signal. No evidence of ~$$\bar{t}$$₁ $$\bar{t}$$₁ production is found, therefore we set 95% C.L. limits on the masses of the stop and the neutralino for several values of the chargino mass and the branching ratio B (X^-±₁ → X^-0₁ ℓ^±v).

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 980804
• Report Number(s): FERMILAB-THESIS--2010-16
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
DECAY
Experiment-HEP
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
LEPTONS
NEUTRINOS
PAIR PRODUCTION
PRODUCTION
QUARKS
STANDARD MODEL
T QUARKS