A measurement of top anti-top quark pair production cross section in proton anti-proton collisions at a center-of-mass energy of 1.96 TeV

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 2003

DOI:https://doi.org/10.2172/1369289· OSTI ID:1369289

Chung, Jongyoung ^[1]

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1. The Ohio State Univ., Columbus, OH (United States)

A measurement of the top anti-top quark pair production cross section in p$$\bar{p}$$ collisions at a center-of-mass energy of 1.96 TeV is presented. The measurement is made using data with integrated luminosity of 109.4 pb^-1, obtained at the Collider Detector at Fermilab between August 2002 and May 2003. A search is made for the dilepton decay channel of top anti-top production, t$$\bar{t}$$→l+νbl-νl$$\bar{b}$$. The Standard Model dilepton decay channel of the top anti-top quark pair production involves two high transverse momentum leptons, a large missing energy from the undetected neutrinos, two jets from the b and b¯ quark fragmentations. Various Standard Model processes can mimic t$$\bar{t}$$ production in this decay channel. These backgrounds are estimated to be 0.65 ± 0.13 events in an integrated luminosity of 109.4 pb^-1. In the data, one ee, three μμ, and two eμ dilepton candidates were observed. From these data, the t$$\bar{t}$$ production cross section of σ _t$$\bar{t}$$ =11.4 $$+6.2\atop{-4.6}$$ pb has been measured. This measurement is consistent with the theoretical prediction of the Standard Model, σ _t$$\bar{t}$$ =6.70 $$+71\atop{0.88}$$ pb assuming a top quark mass of 175 GeV/c².

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1369289
• Report Number(s): FERMILAB-THESIS--2003-60; UMI--31-24976; 639878
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS