$R_{K^{(\ast )}}$ with leptoquarks and the origin of Yukawa couplings

Abstract

We construct a model where the Yukawa couplings of the Standard Model (SM) fermions arise from the breaking of a $Z_2$ symmetry and through mixing with a fourth family of vector-like fermions. By adding a scalar leptoquark, which is an electroweak triplet and odd under the $Z_2$ symmetry, we obtain an explanation for $R_{K^{(\ast )}}$ that is linked to the origin of the Yukawa couplings. The coupling of SM fermions to the leptoquark is mediated by the fourth family fermions, and is predicted to be related to CKM entries and mass ratios of SM fermions.

arXiv comment17 pages, 2 figures. Version accepted for publication in JHEP

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• QCD Improved Matching for Semi-Leptonic B Decays with Leptoquarks
• Is it possible to explain the muon and electron $g-2$ in a $Z^{\prime }$ model?
• GUT Physics in the era of the LHC
• Simplified Models of Flavourful Leptoquarks
• $R_K$ and $R_{K^{\ast }}$ in an Aligned 2HDM with Right-Handed Neutrinos
• Fermion mass hierarchies from vector-like families with an extended 2HDM and a possible explanation for the electron and muon anomalous magnetic moments
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• Hadron Collider Sensitivity to Fat Flavourful $Z^{\prime }$s for $R_{K^{(\ast )}}$
• Finite Family Groups for Fermionic and Leptoquark Mixing Patterns
• Charged-lepton-flavor violation in $|\Delta S|=1$ hyperon decays
• Phenomenology of an extended IDM with loop-generated fermion mass hierarchies
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• Flavour anomalies meet flavour symmetry
• Perturbative unitarity constraints on generic Yukawa interactions