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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/31953

Title: Search for Wt-channel Single Top Quark Production in 7 TeV Proton-proton Collisions using the ATLAS Detector
Authors: Tardif, Dominique
Advisor: Trischuk, William
Department: Physics
Issue Date: 11-Jan-2012
Abstract: The production of single top quarks through the weak interaction is of great interest in particle physics, as it provides the only means to directly measure the CKM matrix element |Vtb|, one of the few remaining Standard Model parameters which has yet to be precisely constrained by direct experimental measurements. This thesis describes a search for Wt-channel single top quark production using proton-proton collision data collected at a center-of-mass energy of 7 TeV by the ATLAS detector at the Large Hadron Collider, corresponding to a total integrated luminosity of 35 pb-1. Collision events having exactly two oppositely-charged electrons or muons, a single high-transverse-momentum jet, and large missing or total transverse energy are selected, resulting in a sample with enhanced single top purity. 38 data events are found to survive the selection, in good agreement with the expected sum from all signal and background predictions of 38.6 ± 6.0. The Wt content of the selected sample is predicted to amount to 4.3 ± 0.3 events. The resulting cross-section measurement is 10 +20-10 (stat) +20-10 (syst) pb. As this level of precision is insufficient to claim evidence or discovery of this process, an upper limit is also derived for the parameter of interest, resulting in σ(pp→Wt) < 70 pb at 95% confidence level.
URI: http://hdl.handle.net/1807/31953
Appears in Collections:Doctoral

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