Journal
PHYSICS LETTERS B
Volume 691, Issue 4, Pages 183-190Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2010.06.036
Keywords
Massive gluon; Top quark
Funding
- US Department of Energy and 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
- World Class University Program, the National Research Foundation of Korea
- Science and Technology Facilities Council and the 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
- STFC [ST/H001069/1, ST/H001077/1, ST/H001026/2, ST/H001026/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H001026/2, ST/H001026/1, ST/H001069/1, ST/H001077/1, PP/E000444/1] Funding Source: researchfish
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We present the result of a search for a massive color-octet vector particle, (e.g. a massive gluon) decaying to a pair of top quarks in proton-antiproton collisions with a center-of-mass energy of 1.96 TeV. This search is based on 1.9 fb(-1) of data collected using the CDF detector during Run II of the Tevatron at Fermilab. We study t (t) over bar events in the lepton + jets channel with at least one b-tagged jet. A massive gluon is characterized by its mass, decay width, and the strength of its coupling to quarks. These parameters are determined according to the observed invariant mass distribution of top quark pairs. We set limits on the massive gluon coupling strength for masses between 400 and 800 GeV/c(2) and width-to-mass ratios between 0.05 and 0.50. The coupling strength of the hypothetical massive gluon to quarks is consistent with zero within the explored parameter space. (C) 2010 Elsevier B.V. All rights reserved.
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