Light non-degenerate composite partners at the LHC

Cédric Delaunay, Thomas Flacke, J. Gonzalez-Fraile, Seung Joon Lee, Giuliano Panico, Gilad Perez

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

We study the phenomenological implications of a large degree of compositeness for the light generation quarks in composite pseudo-Nambu- Goldstone-boson Higgs models. We focus in particular on phenomenologically viable scenarios where the right-handed up-type quarks have a sizable mixing with the strong dynamics. For concreteness we assume the latter to be characterized by an SO(5)/SO(4) symmetry with fermionic resonances in the SO(4) singlet and fourplet representations. Singlet partners dominantly decay to a Higgs boson and jets. Since no dedicated searches are currently looking for these final states, singlet partners can still be rather light. Conversely, some fourplet partner components dominantly decay to an electroweak gauge boson and a jet, a type of signature which has been analysed at the LHC. We have reinterpreted various ATLAS and CMS analyses in order to constrain the parameter space of this class of models. In the limit of first two generation degeneracy, as in minimal flavor violation or U(2)-symmetric flavor models, fourplet partners need to be relatively heavy, with masses above 1.8 TeV, or the level of compositeness needs to be rather small. The situation is significantly different in models which deviate from the first two generation degeneracy paradigm, as charm quark parton distribution functions are suppressed relative to the up quark ones. We find that the right-handed charm quark component can be mostly composite together with their partners being as light as 600 GeV, while the right-handed up quark needs either to be mostly elementary or to have partners as heavy as 2 TeV. Models where right-handed up-type quarks are fully composite fermions are also analysed and yield qualitatively similar conclusions. Finally, we consider the case where both the fourplet and the singlet states are present. We demonstrate that in this case the fourplet bounds could be significantly weaken due to a combination of smaller production rates and the opening of new channels including cascade processes.

Original languageEnglish
Article number055
JournalJournal of High Energy Physics
Volume2014
Issue number2
DOIs
Publication statusPublished - 2014 Feb 1

Fingerprint

quarks
composite materials
Higgs bosons
decay
partons
cascades
bosons
fermions
distribution functions
signatures
symmetry

Keywords

  • Beyond Standard Model
  • Heavy Quark Physics
  • Technicolor and Composite Models

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Delaunay, C., Flacke, T., Gonzalez-Fraile, J., Lee, S. J., Panico, G., & Perez, G. (2014). Light non-degenerate composite partners at the LHC. Journal of High Energy Physics, 2014(2), [055]. https://doi.org/10.1007/JHEP02(2014)055

Light non-degenerate composite partners at the LHC. / Delaunay, Cédric; Flacke, Thomas; Gonzalez-Fraile, J.; Lee, Seung Joon; Panico, Giuliano; Perez, Gilad.

In: Journal of High Energy Physics, Vol. 2014, No. 2, 055, 01.02.2014.

Research output: Contribution to journalArticle

Delaunay, C, Flacke, T, Gonzalez-Fraile, J, Lee, SJ, Panico, G & Perez, G 2014, 'Light non-degenerate composite partners at the LHC', Journal of High Energy Physics, vol. 2014, no. 2, 055. https://doi.org/10.1007/JHEP02(2014)055
Delaunay C, Flacke T, Gonzalez-Fraile J, Lee SJ, Panico G, Perez G. Light non-degenerate composite partners at the LHC. Journal of High Energy Physics. 2014 Feb 1;2014(2). 055. https://doi.org/10.1007/JHEP02(2014)055
Delaunay, Cédric ; Flacke, Thomas ; Gonzalez-Fraile, J. ; Lee, Seung Joon ; Panico, Giuliano ; Perez, Gilad. / Light non-degenerate composite partners at the LHC. In: Journal of High Energy Physics. 2014 ; Vol. 2014, No. 2.
@article{4adf3ca7e2c440be82b925ffd98307e8,
title = "Light non-degenerate composite partners at the LHC",
abstract = "We study the phenomenological implications of a large degree of compositeness for the light generation quarks in composite pseudo-Nambu- Goldstone-boson Higgs models. We focus in particular on phenomenologically viable scenarios where the right-handed up-type quarks have a sizable mixing with the strong dynamics. For concreteness we assume the latter to be characterized by an SO(5)/SO(4) symmetry with fermionic resonances in the SO(4) singlet and fourplet representations. Singlet partners dominantly decay to a Higgs boson and jets. Since no dedicated searches are currently looking for these final states, singlet partners can still be rather light. Conversely, some fourplet partner components dominantly decay to an electroweak gauge boson and a jet, a type of signature which has been analysed at the LHC. We have reinterpreted various ATLAS and CMS analyses in order to constrain the parameter space of this class of models. In the limit of first two generation degeneracy, as in minimal flavor violation or U(2)-symmetric flavor models, fourplet partners need to be relatively heavy, with masses above 1.8 TeV, or the level of compositeness needs to be rather small. The situation is significantly different in models which deviate from the first two generation degeneracy paradigm, as charm quark parton distribution functions are suppressed relative to the up quark ones. We find that the right-handed charm quark component can be mostly composite together with their partners being as light as 600 GeV, while the right-handed up quark needs either to be mostly elementary or to have partners as heavy as 2 TeV. Models where right-handed up-type quarks are fully composite fermions are also analysed and yield qualitatively similar conclusions. Finally, we consider the case where both the fourplet and the singlet states are present. We demonstrate that in this case the fourplet bounds could be significantly weaken due to a combination of smaller production rates and the opening of new channels including cascade processes.",
keywords = "Beyond Standard Model, Heavy Quark Physics, Technicolor and Composite Models",
author = "C{\'e}dric Delaunay and Thomas Flacke and J. Gonzalez-Fraile and Lee, {Seung Joon} and Giuliano Panico and Gilad Perez",
year = "2014",
month = "2",
day = "1",
doi = "10.1007/JHEP02(2014)055",
language = "English",
volume = "2014",
journal = "Journal of High Energy Physics",
issn = "1126-6708",
publisher = "Springer Verlag",
number = "2",

}

TY - JOUR

T1 - Light non-degenerate composite partners at the LHC

AU - Delaunay, Cédric

AU - Flacke, Thomas

AU - Gonzalez-Fraile, J.

AU - Lee, Seung Joon

AU - Panico, Giuliano

AU - Perez, Gilad

PY - 2014/2/1

Y1 - 2014/2/1

N2 - We study the phenomenological implications of a large degree of compositeness for the light generation quarks in composite pseudo-Nambu- Goldstone-boson Higgs models. We focus in particular on phenomenologically viable scenarios where the right-handed up-type quarks have a sizable mixing with the strong dynamics. For concreteness we assume the latter to be characterized by an SO(5)/SO(4) symmetry with fermionic resonances in the SO(4) singlet and fourplet representations. Singlet partners dominantly decay to a Higgs boson and jets. Since no dedicated searches are currently looking for these final states, singlet partners can still be rather light. Conversely, some fourplet partner components dominantly decay to an electroweak gauge boson and a jet, a type of signature which has been analysed at the LHC. We have reinterpreted various ATLAS and CMS analyses in order to constrain the parameter space of this class of models. In the limit of first two generation degeneracy, as in minimal flavor violation or U(2)-symmetric flavor models, fourplet partners need to be relatively heavy, with masses above 1.8 TeV, or the level of compositeness needs to be rather small. The situation is significantly different in models which deviate from the first two generation degeneracy paradigm, as charm quark parton distribution functions are suppressed relative to the up quark ones. We find that the right-handed charm quark component can be mostly composite together with their partners being as light as 600 GeV, while the right-handed up quark needs either to be mostly elementary or to have partners as heavy as 2 TeV. Models where right-handed up-type quarks are fully composite fermions are also analysed and yield qualitatively similar conclusions. Finally, we consider the case where both the fourplet and the singlet states are present. We demonstrate that in this case the fourplet bounds could be significantly weaken due to a combination of smaller production rates and the opening of new channels including cascade processes.

AB - We study the phenomenological implications of a large degree of compositeness for the light generation quarks in composite pseudo-Nambu- Goldstone-boson Higgs models. We focus in particular on phenomenologically viable scenarios where the right-handed up-type quarks have a sizable mixing with the strong dynamics. For concreteness we assume the latter to be characterized by an SO(5)/SO(4) symmetry with fermionic resonances in the SO(4) singlet and fourplet representations. Singlet partners dominantly decay to a Higgs boson and jets. Since no dedicated searches are currently looking for these final states, singlet partners can still be rather light. Conversely, some fourplet partner components dominantly decay to an electroweak gauge boson and a jet, a type of signature which has been analysed at the LHC. We have reinterpreted various ATLAS and CMS analyses in order to constrain the parameter space of this class of models. In the limit of first two generation degeneracy, as in minimal flavor violation or U(2)-symmetric flavor models, fourplet partners need to be relatively heavy, with masses above 1.8 TeV, or the level of compositeness needs to be rather small. The situation is significantly different in models which deviate from the first two generation degeneracy paradigm, as charm quark parton distribution functions are suppressed relative to the up quark ones. We find that the right-handed charm quark component can be mostly composite together with their partners being as light as 600 GeV, while the right-handed up quark needs either to be mostly elementary or to have partners as heavy as 2 TeV. Models where right-handed up-type quarks are fully composite fermions are also analysed and yield qualitatively similar conclusions. Finally, we consider the case where both the fourplet and the singlet states are present. We demonstrate that in this case the fourplet bounds could be significantly weaken due to a combination of smaller production rates and the opening of new channels including cascade processes.

KW - Beyond Standard Model

KW - Heavy Quark Physics

KW - Technicolor and Composite Models

UR - http://www.scopus.com/inward/record.url?scp=84894417836&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84894417836&partnerID=8YFLogxK

U2 - 10.1007/JHEP02(2014)055

DO - 10.1007/JHEP02(2014)055

M3 - Article

VL - 2014

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1126-6708

IS - 2

M1 - 055

ER -