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 Comisión Interministerial de Ciencia y Tecnología, Spain; the European Community’s Human Potential Programme; the Slovak R&D Agency; and the Academy of Finland.

We report a measurement of the ratio of the tt̅ to Z/γ* production cross sections in √s=1.96 TeV pp̅ collisions using data corresponding to an integrated luminosity of up to 4.6 fb-1, collected by the CDF II detector. The tt̅ cross section ratio is measured using two complementary methods, a b-jet tagging measurement and a topological approach. By multiplying the ratios by the well-known theoretical Z/γ*→ll cross section predicted by the standard model, the extracted tt̅ cross sections are effectively insensitive to the uncertainty on luminosity. A best linear unbiased estimate is used to combine both measurements with the result σtt̅ =7.70±0.52 pb, for a top-quark mass of 172.5 GeV/c2.

7 páginas, 2 figuras, 1 tabla.-- PACS numbers: 13.87.Ce, 12.38.Qk, 14.65.Ha.-- CDF Collaboration: et al.

Peer reviewed