Abstract
We present a model which connects the neutral current B anomalies with composite Higgs models. The model is based on the minimal fundamental composite Higgs model with $SU(4)/Sp(4)$ coset. The strong dynamics spontaneously break the symmetry and introduce five Nambu-Goldstone bosons. Four of them become the Standard Model Higgs doublet and the last one, corresponding to the broken local $U(1)'$ symmetry, is eaten by the gauge boson. This leads to an additional TeV-scale $Z'$ boson, which can explain the recent B anomalies. The experimental constraints and allowed parameter space are discussed in detail.
Highlights
The Standard Model (SM) of particle physics successfully describes all known elementary particles and their interactions
Among all types of CHMs with different cosets, the CHMs with fundamental gauge dynamics featuring only fermionic matter fields are of interest in many studies [5,6,7,8], which is known as the fundamental composite Higgs model (FCHM)
We presented a new Z0 solution to the B anomalies, whose scale is related to the symmetry breaking scale of the underlying strong dynamics
Summary
The Standard Model (SM) of particle physics successfully describes all known elementary particles and their interactions. Among all types of CHMs with different cosets, the CHMs with fundamental gauge dynamics featuring only fermionic matter fields are of interest in many studies [5,6,7,8], which is known as the fundamental composite Higgs model (FCHM) In this type of CHMs, hyperfermions ψ are introduced as the representation of hypercolor (HC) group GHC. The minimal FCHM, which is based on the SUð4Þ=Spð4Þ coset [9,10,11], contains five pNGBs. Four of them form the SM Higgs doublet, and the fifth one, as a SM singlet, could be a light scalar boson (if the symmetry is global) or a TeV-scale Z0 boson (if the symmetry is local). We can construct the low-energy effective Lagrangian for these pNGB fields
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