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Collider signatures of vector-like fermions from a flavor symmetric model

Bonilla, Cesar ; Hernández, A. E.Cárcamo ; Gonçalves, João ; Freitas, Felipe F. ; Morais, António P. LU and Pasechnik, R. LU (2022) In Journal of High Energy Physics 2022(1).
Abstract

We propose a model with two Higgs doublets and several SU(2) scalar singlets with a global non-Abelian flavor symmetry Q6× Z2. This discrete group accounts for the observed pattern of fermion masses and mixing angles after spontaneous symmetry breaking. In this scenario only the third generation of fermions get their masses as in the Standard Model (SM). The masses of the remaining fermions are generated through a seesaw-like mechanism. To that end, the matter content of the model is enlarged by introducing electrically charged vector-like fermions (VLFs), right handed Majorana neutrinos and several SM scalar singlets. Here we study the processes involving VLFs that are within the reach of the Large Hadron Collider... (More)

We propose a model with two Higgs doublets and several SU(2) scalar singlets with a global non-Abelian flavor symmetry Q6× Z2. This discrete group accounts for the observed pattern of fermion masses and mixing angles after spontaneous symmetry breaking. In this scenario only the third generation of fermions get their masses as in the Standard Model (SM). The masses of the remaining fermions are generated through a seesaw-like mechanism. To that end, the matter content of the model is enlarged by introducing electrically charged vector-like fermions (VLFs), right handed Majorana neutrinos and several SM scalar singlets. Here we study the processes involving VLFs that are within the reach of the Large Hadron Collider (LHC). We perform collider studies for vector-like leptons (VLLs) and vector-like quarks (VLQs), focusing on double production channels for both cases, while for VLLs single production topologies are also included. Utilizing genetic algorithms for neural network optimization, we determine the statistical significance for a hypothetical discovery at future LHC runs. In particular, we show that we can not safely exclude VLLs for masses greater than 200 GeV. For VLQ’s in our model, we show that we can probe their masses up to 3.8 TeV, if we take only into account the high-luminosity phase of the LHC. Considering Run-III luminosities, we can also exclude VLQs for masses up to 3.4 TeV. We also show how the model with predicted VLL masses accommodates the muon anomalous magnetic moment.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Beyond Standard Model, Hadron-Hadron scattering (experiments), vector-like quarks
in
Journal of High Energy Physics
volume
2022
issue
1
article number
154
publisher
Springer
external identifiers
  • scopus:85126927158
ISSN
1029-8479
DOI
10.1007/JHEP01(2022)154
language
English
LU publication?
yes
id
b70b7130-63af-41f8-bf00-4b526a7d93ec
date added to LUP
2022-10-27 09:19:34
date last changed
2024-04-18 15:13:40
@article{b70b7130-63af-41f8-bf00-4b526a7d93ec,
  abstract     = {{<p>We propose a model with two Higgs doublets and several SU(2) scalar singlets with a global non-Abelian flavor symmetry Q<sub>6</sub>× Z<sub>2</sub>. This discrete group accounts for the observed pattern of fermion masses and mixing angles after spontaneous symmetry breaking. In this scenario only the third generation of fermions get their masses as in the Standard Model (SM). The masses of the remaining fermions are generated through a seesaw-like mechanism. To that end, the matter content of the model is enlarged by introducing electrically charged vector-like fermions (VLFs), right handed Majorana neutrinos and several SM scalar singlets. Here we study the processes involving VLFs that are within the reach of the Large Hadron Collider (LHC). We perform collider studies for vector-like leptons (VLLs) and vector-like quarks (VLQs), focusing on double production channels for both cases, while for VLLs single production topologies are also included. Utilizing genetic algorithms for neural network optimization, we determine the statistical significance for a hypothetical discovery at future LHC runs. In particular, we show that we can not safely exclude VLLs for masses greater than 200 GeV. For VLQ’s in our model, we show that we can probe their masses up to 3.8 TeV, if we take only into account the high-luminosity phase of the LHC. Considering Run-III luminosities, we can also exclude VLQs for masses up to 3.4 TeV. We also show how the model with predicted VLL masses accommodates the muon anomalous magnetic moment.</p>}},
  author       = {{Bonilla, Cesar and Hernández, A. E.Cárcamo and Gonçalves, João and Freitas, Felipe F. and Morais, António P. and Pasechnik, R.}},
  issn         = {{1029-8479}},
  keywords     = {{Beyond Standard Model; Hadron-Hadron scattering (experiments); vector-like quarks}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{1}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{Collider signatures of vector-like fermions from a flavor symmetric model}},
  url          = {{http://dx.doi.org/10.1007/JHEP01(2022)154}},
  doi          = {{10.1007/JHEP01(2022)154}},
  volume       = {{2022}},
  year         = {{2022}},
}