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

Abstract

We propose a model with two Higgs doublets and several $SU(2)$ scalar singlets with a global non-Abelian flavor symmetry ${\mathcal{Q}}_6\times {\mathcal{Z}}_2$. 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 $200\mathrm{GeV}$. 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 $3.4\mathrm{TeV}$. We also show how the model with predicted VLL masses accommodates the muon anomalous magnetic moment.

32 pages,16 figures. Additional references and discussion. Matches version to be published in JHEP

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Cited by in corpus (8)

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• Discrete symmetries and Efficient Counting of Operators
• The Two Scales of New Physics in Higgs Couplings
• Deep Learning Searches for Vector-Like Leptons at the LHC and Electron/Muon Colliders
• evortran: a modern Fortran package for genetic algorithms with applications from LHC data fitting to LISA signal reconstruction
• Fermion masses and mixings and $g-2$ muon anomaly in a $Q_6$ flavored 2HDM
• Collider phenomenology of new neutral scalars in a flavoured multi-Higgs model