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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

by Chung, Jongyoung

Abstract (Summary)
A measurement of the top anti-top quark pair production cross section in pp? 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, tt? ? ?^+v?b?-v??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 tt? 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 ?? and two e? dilepton candidates were observed. From these data, the tt? production cross section of ?tt? = 11.4+6.2-4.6 pb has been measured. This measurement is consistent with the theoretical prediction of the Standard Model, ?tt? = 6.70+0.71-0.88 pb assuming a top quark mass of 175 $GeV/c^2.
Bibliographical Information:

Advisor:

School:The Ohio State University

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:top quark dilepton tevatron cross section cdf

ISBN:

Date of Publication:01/01/2003

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