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Advances in High Energy Physics
Volume 2013 (2013), Article ID 789158, 12 pages
Review Article

Yukawa Bound States and Their LHC Phenomenology

Department of Physics, National Taiwan University, Taipei 101, Taiwan

Received 30 July 2012; Accepted 10 December 2012

Academic Editor: Tao Han

Copyright © 2013 Enkhbat Tsedenbaljir. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We present the current status on the possible bound states of extra generation quarks. These include phenomenology and search strategy at the LHC. If chiral fourth-generation quarks do exist their strong Yukawa couplings, implied by current experimental lower bound on their masses, may lead to formation of bound states. Due to nearly degenerate 4G masses suggested by Precision Electroweak Test one can employ “heavy isospin” symmetry to classify possible spectrum. Among these states, the color-octet isosinglet vector is the easiest to be produced at the LHC. The discovery potential and corresponding decay channels are covered in this paper. With possible light Higgs at ~125 GeV two-Higgs doublet version is briefly discussed.