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Title: Heavy color-octet particles at the LHC

Many new-physics models, especially those with a color-triplet top-quark partner, contain a heavy color-octet state. The “naturalness” argument for a light Higgs boson requires that the color-octet state be not much heavier than a TeV, and thus it can be pair-produced with large cross sections at high-energy hadron colliders. It may decay preferentially to a top quark plus a top partner, which subsequently decays to a top quark plus a color-singlet state. This singlet can serve as a WIMP dark-matter candidate. Such decay chains lead to a spectacular signal of four top quarks plus missing energy. We pursue a general categorization of the color-octet states and their decay products according to their spin and gauge quantum numbers. Here, we review the current bounds on the new states at the LHC and study the expected discovery reach at the 8-TeV and 14-TeV runs. We also present the production rates at a future 100-TeV hadron collider, where the cross sections will be many orders of magnitude greater than at the 14-TeV LHC. Furthermore, we explore the extent to which one can determine the color octet’s mass, spin, and chiral couplings. Finally, we propose a test to determine whether the fermionic color octetmore » is a Majorana particle.« less
 [1] ;  [2] ;  [2] ;  [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics
  2. Univ. of Pittsburgh, PA (United States). PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PITT PACC), Dept. of Physics & Astronomy
  3. Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada); Univ. of Waterloo, ON (Canada). Dept. of Physics & Astronomy
Publication Date:
Report Number(s):
Journal ID: ISSN 1029-8479; KA2401012
Grant/Contract Number:
SC0012704; PHY-1212635; FG02-12ER41832; AC02-98CH10886
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2015; Journal Issue: 5; Journal ID: ISSN 1029-8479
Springer Berlin
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); Government of Canada
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; HET; octet; LHC; TeV; collider; top-quark; Majorana; Phenomenology of Field Theories in Higher Dimensions; Supersymmetry Phenomenology
OSTI Identifier: