Heavy color-octet particles at the LHC

Chen, Chien-Yi; Freitas, Ayres; Han, Tao; Lee, Keith S.  M.

doi:10.1007/JHEP05(2015)135

Title: Heavy color-octet particles at the LHC

Abstract

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

Authors:

Chen, Chien-Yi ^[1]; Freitas, Ayres ^[2]; Han, Tao ^[2]; Lee, Keith S. M. ^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics
Univ. of Pittsburgh, PA (United States). PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PITT PACC), Dept. of Physics & Astronomy
Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada); Univ. of Waterloo, ON (Canada). Dept. of Physics & Astronomy

Publication Date:: Tue May 26 00:00:00 EDT 2015

Research Org.:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP); Government of Canada

OSTI Identifier:: 1354640

Report Number(s):: BNL-113783-2017-JA
Journal ID: ISSN 1029-8479; KA2401012

Grant/Contract Number:: SC0012704; PHY-1212635; FG02-12ER41832; AC02-98CH10886

Resource Type:: 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

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; HET; octet; LHC; TeV; collider; top-quark; Majorana; Phenomenology of Field Theories in Higher Dimensions; Supersymmetry Phenomenology

Citation Formats


                    Chen, Chien-Yi, Freitas, Ayres, Han, Tao, and Lee, Keith S.  M. Heavy color-octet particles at the LHC.  United States: N. p., 2015. 
Web.  doi:10.1007/JHEP05(2015)135.

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                    Chen, Chien-Yi, Freitas, Ayres, Han, Tao, & Lee, Keith S.  M. Heavy color-octet particles at the LHC.  United States.  https://doi.org/10.1007/JHEP05(2015)135

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                    Chen, Chien-Yi, Freitas, Ayres, Han, Tao, and Lee, Keith S.  M. Tue .  
"Heavy color-octet particles at the LHC".  United States.  https://doi.org/10.1007/JHEP05(2015)135.  https://www.osti.gov/servlets/purl/1354640.

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@article{osti_1354640,

  title        = {Heavy color-octet particles at the LHC},

  author       = {Chen, Chien-Yi and Freitas, Ayres and Han, Tao and Lee, Keith S.  M.},

  abstractNote = {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 octet is a Majorana particle.},

  doi          = {10.1007/JHEP05(2015)135},

  journal      = {Journal of High Energy Physics (Online)},

  number       = 5,

  volume       = 2015,

  place        = {United States},

  year         = {Tue May 26 00:00:00 EDT 2015},

  month        = {Tue May 26 00:00:00 EDT 2015}

}

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Journal Article:

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Accepted Manuscript (DOE)

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https://doi.org/10.1007/JHEP05(2015)135

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