@article{10902/1850,
year = {2011},
month = {4},
url = {http://hdl.handle.net/10902/1850},
abstract = {We present a direct measurement of the mass difference between t and  t quarks using t t candidate
events in the lepton þ jets channel, collected with the CDF II detector at Fermilab’s 1.96 TeV Tevatron pp 
Collider. We make an event by event estimate of the mass difference to construct templates for top quark
pair signal events and background events. The resulting mass difference distribution of data is compared
to templates of signals and background using a maximum likelihood fit. From a sample corresponding to
an integrated luminosity of 5:6 fb 1, we measure a mass difference,  Mtop ¼ Mt  M t ¼  3:3  
1:4ðstatÞ   1:0ðsystÞ GeV=c2, approximately 2 standard deviations away from the CPT hypothesis of
zero mass difference.},
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 Korean 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; the Academy of Finland; and the Australian Research Council (ARC).},
publisher = {American Physical Society},
publisher = {Physical Review Letters, 2011, 106(15), 152001},
title = {Measurement of the mass difference between t and t¯ quarks},
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 and Vizán García, Jesús Manuel},
}