7 pages, 4 figures.-- PACS nrs.: 14.70.Fm; 13.38.Be; 13.85.Qk.-- ISI Article Identifier: 000250140600014.-- ArXiv pre-print available at: http://arxiv.org/abs/0707.0085.-- et al.
We present a measurement of the W-boson mass using 200 pb(-1) of data collected in p(p)over-bar collisions at sqrt{s}=1.96 TeV by the CDF II detector at run II of the Fermilab Tevatron. With a sample of 63 964 W --> e(nu) candidates and 51 128 W --> μ(nu) candidates, we measure M(W) = 80413 ± 34(stat) ± 34(syst) = 80 413 ± 48 MeV/c^2. This is the most precise single measurement of the W-boson mass to date.
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, U.K.; 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 European Commission under the Marie Curie Programme; the Slovak R&D Agency; and the Academy of Finland.