Title
Measurement of the <tex>$t\overline{t}$</tex> cross section in <tex>$p\overline{p}$</tex> collisions at <tex>$\sqrt{s}$</tex>=1.96 TeV using dilepton events with a lepton plus track selection Measurement of the <tex>$t\overline{t}$</tex> cross section in <tex>$p\overline{p}$</tex> collisions at <tex>$\sqrt{s}$</tex>=1.96 TeV using dilepton events with a lepton plus track selection
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review : D : particles and fields. - Lancaster, Pa, 1970 - 2003
Volume/pages
79(2009) :11 , p. 112007,1-112007,41
ISSN
0556-2821
ISI
000267701300010
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
This paper reports a measurement of the cross section for the pair production of top quarks in pp&#773; collisions at √s=1.96  TeV at the Fermilab Tevatron. The data were collected from the CDF run II detector in a set of runs with a total integrated luminosity of 1.1  fb-1. The cross section is measured in the dilepton channel, the subset of tt&#773; events in which both top quarks decay through t→Wb→&#8467;νb, where &#8467;=e, μ, or τ. The lepton pair is reconstructed as one identified electron or muon and one isolated track. The use of an isolated track to identify the second lepton increases the tt&#773; acceptance, particularly for the case in which one W decays as W→τν. The purity of the sample may be further improved at the cost of a reduction in the number of signal events, by requiring an identified b jet. We present the results of measurements performed with and without the request of an identified b jet. The former is the first published CDF result for which a b-jet requirement is added to the dilepton selection. In the CDF data there are 129 pretag lepton+track candidate events, of which 69 are tagged. With the tagging information, the sample is divided into tagged and untagged subsamples, and a combined cross section is calculated by maximizing a likelihood. The result is σtt&#773; =9.6±1.2(stat)-0.5+0.6(sys)±0.6(lum)  pb, assuming a branching ratio of BR(W→&#8467;ν)=10.8% and a top mass of mt=175  GeV/c2.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/ea1144/7e550fe6.pdf
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