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Flavour Deconstructing the Composite Higgs
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abstract
We present a flavour non-universal extension of the Standard Model combined with the idea of Higgs compositeness. At the TeV scale, the gauge groups $SU(2)_R$ and $U(1)_{B-L}$ are assumed to act in a non-universal manner on light- and third-generation fermions, while the Higgs emerges as a pseudo Nambu-Goldstone boson of the spontaneous global symmetry breaking $Sp(4)\to SU(2)_L\times SU(2)_R^{[3]}$, attributed to new strong dynamics. The flavour deconstruction means the couplings of the light families to the composite sector (and therefore the pNGB Higgs) are suppressed by powers of a heavy mass scale (from which the Higgs is nevertheless shielded by compositeness), explaining the flavour puzzle. We present a detailed analysis of the radiatively generated Higgs potential, showing how this intrinsically-flavoured framework has the ingredients to justify the unavoidable tuning in the Higgs potential necessary to separate electroweak and composite scales. This happens for large enough values of the $SU(2)_R^{[3]}$ gauge coupling and light enough flavoured gauge bosons resulting from the deconstruction, whose phenomenology is also investigated. The model is compatible with current experimental bounds and predicts new states at the TeV scale, which are within the reach of near future experimental searches.
Forward citations
Cited by 5 Pith papers
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Partial Compositeness: from Anarchy to Symmetry
A two-stage renormalization group flow, anarchic at high energies and flavor-symmetric at low energies, dynamically realizes Minimal Flavor Violation in composite Higgs models at a 5-10 TeV scale.
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Deconstructed Weak Isospin from a Symplectic Symmetry
An Sp(6) completion of deconstructed weak isospin predicts six new flavour-changing gauge bosons and pushes the intermediate SU(2)^3 breaking scale above ~550 TeV (or ~150 TeV at large scale separation) via K/D mixing...
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Probing Flavour Deconstruction via Primordial Gravitational Waves
Flavour deconstruction phase transitions can generate detectable gravitational waves, but their spectra typically peak above the millihertz range, making LISA detection possible yet not guaranteed.
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Constraints on lepton-flavor mixing with third-generation new physics
The U(2)_ℓ-breaking spurion δ is constrained to |δ| < 0.051 (95% CL) by R_K(*) and B_s→μμ data, with derived upper limits for LFV τ and B decays.
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Flavour hierarchies, extended groups and composites
A composite Higgs model built on flavour-deconstructed gauge groups produces suppressed CKM and anarchic PMNS mixing as a consequence of the chosen fermion charge assignments.
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