期刊
PHYSICAL REVIEW LETTERS
卷 106, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.152001
关键词
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资金
- U.S. Department of Energy
- National Science Foundation
- Italian Istituto Nazionale di Fisica Nucleare
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- Natural Sciences and Engineering Research Council of Canada
- National Science Council of the Republic of China
- Swiss National Science Foundation
- A.P. Sloan Foundation
- Bundesministerium fur Bildung und Forschung, Germany
- National Research Foundation of Korea
- Science and Technology Facilities Council
- Royal Society, UK
- Institut National de Physique Nucleaire et Physique des Particules/CNRS
- Russian Foundation for Basic Research
- Ministerio de Ciencia e Innovacion
- Slovak RD Agency
- Academy of Finland
- Australian Research Council (ARC)
- Grants-in-Aid for Scientific Research [18071002] Funding Source: KAKEN
- National Research Foundation of Korea [R32-2011-000-20001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- ICREA Funding Source: Custom
- Science and Technology Facilities Council [PP/E000444/1, ST/H001077/1, ST/H001069/1, ST/H001026/1, ST/H001026/2] Funding Source: researchfish
- STFC [ST/H001026/2, ST/H001077/1, ST/H001069/1, ST/H001026/1] Funding Source: UKRI
We present a direct measurement of the mass difference between t and (t) over bar quarks using t (t) over bar candidate events in the lepton + jets channel, collected with the CDF II detector at Fermilab's 1.96 TeV Tevatron p (p) over bar 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, Delta M-top = M-t - M-(t) over bar = - 3:3 +/- 1.4(stat) +/- 1.0(syst) GeV/c(2), approximately 2 standard deviations away from the CPT hypothesis of zero mass difference.
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