@article{10902/1859,
year = {2010},
month = {12},
url = {http://hdl.handle.net/10902/1859},
abstract = {We present a measurement of the top-quark width in the lepton+jets decay channel of tt̅ events produced in pp̅ collisions at Fermilab’s Tevatron collider and collected by the CDF II detector. From a data sample corresponding to 4.3  fb-1 of integrated luminosity, we identify 756 candidate events. The top-quark mass and the mass of the hadronically decaying W boson that comes from the top-quark decay are reconstructed for each event and compared with templates of different top-quark widths (Γt) and deviations from nominal jet energy scale (ΔJES) to perform a simultaneous fit for both parameters, where ΔJES is used for the in situ calibration of the jet energy scale. By applying a Feldman-Cousins approach, we establish an upper limit at 95% confidence level (CL) of Γt<7.6  GeV and a two-sided 68% CL interval of 0.3  GeV<Γt<4.4  GeV for a top-quark mass of 172.5  GeV/c2, which are consistent with the standard model prediction.},
organization = {We 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 fu¨r Bildung und Forschung,
Germany; the World Class University Program, the
National Research Foundation of Korea; 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 Innovacio´n, and
Programa Consolider-Ingenio 2010, Spain; the Slovak
R&D Agency; and the Academy of Finland.},
publisher = {American Physical Society},
publisher = {Physical Review Letters, vol. 105, iss. 23, art. num. 232003 (2010)},
title = {Direct Top-Quark Width Measurement at CDF},
author = {Aaltonen, Timo Antero and Álvarez González, Bárbara and Casal Laraña, Bruno and Cuevas Maestro, Francisco Javier and Gómez Gramuglio, Gervasio and Palencia Cortezón, José Enrique and Rodrigo Anoro, Teresa and Ruiz Jimeno, Alberto and Scodellaro, Luca and Vila Álvarez, Iván  and Vilar Cortabitarte, Rocío},
}