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dc.contributor.authorCDF Collaboration-
dc.contributor.authorCabrera, Susana-
dc.contributor.authorCuenca Almenar, Cristóbal-
dc.contributor.authorÁlvarez González, B.-
dc.contributor.authorCasal, Bruno-
dc.contributor.authorCuevas, Javier-
dc.contributor.authorGómez, G.-
dc.contributor.authorRodrigo, Teresa-
dc.contributor.authorRuiz Jimeno, Alberto-
dc.contributor.authorScodellaro, Luca-
dc.contributor.authorVila, Iván-
dc.contributor.authorVilar, Rocío-
dc.contributor.authorAaltonen, T.-
dc.date.accessioned2010-03-12T12:09:25Z-
dc.date.available2010-03-12T12:09:25Z-
dc.date.issued2009-06-12-
dc.identifier.citationPhysical Review - Section D - Particles and Fields 79 (11): 112007 (2009)en_US
dc.identifier.issn1550-7998-
dc.identifier.urihttp://hdl.handle.net/10261/22339-
dc.description.abstractThis paper reports a measurement of the cross section for the pair production of top quarks in p (p) over bar collisions at root 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 t (t) over bar events in which both top quarks decay through t -> Wb -> l nu b, where l = e, mu, or tau. 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 t (t) over bar acceptance, particularly for the case in which one W decays as W -> tau nu. 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 sigma(t (t) over bar) = 9.6 +/- 1.2(stat)(-0.5)(+0.6)(sys) +/- 0.6(lum) pb, assuming a branching ratio of BR(W -> l nu) = 10.8% and a top mass of m(t) = 175 GeV/c(2).en_US
dc.description.sponsorshipWe thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A.P. Sloan Foundation; the Bundesministerium für Bildung und Forschung, Germany; the Korean Science and Engineering Foundation and the Korean Research Foundation; the Science and Technology Facilities Council and the Royal Society, UK; the Institut National de Physique Nucleaire et Physique des Particules/CNRS; the Russian Foundation for Basic Research; the Ministerio de Ciencia e Innovación, and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; and the Academy of Finland.en_US
dc.format.extent693224 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsopenAccessen_US
dc.titleMeasurement of the t(t)over-bar cross section in p(p)over-bar collisions at root s=1.96 TeV using dilepton events with a lepton plus track selectionen_US
dc.typeartículoen_US
dc.identifier.doi10.1103/PhysRevD.79.112007-
dc.description.peerreviewedPeer revieweden_US
dc.relation.publisherversionhttp://dx.doi.org/ 10.1103/PhysRevD.79.112007en_US
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