On Flavour and Naturalness of Composite Higgs Models

Abstract

We analyse the interplay of the constraints imposed on flavour-symmetric Composite Higgs models by Naturalness considerations and the constraints derived from Flavour Physics and Electroweak Precision Tests. Our analysis is based on the Effective Field Theory which describes the Higgs as a pseudo-Nambu-Goldstone boson and also includes the composite fermionic resonances. Within this approach one is able to identify the directions in the parameter space where the $U(3)$-symmetric flavour models can pass the current experimental constraints, without conflicting with the light Higgs mass. We also derive the general features of the $U(2)$-symmetric models required by the experimental bounds, in case of elementary and totally composite $t_R$. An effect in the $Z\bar{b}b$ coupling, which can potentially allow for sizable deviations in $Z\to \bar{b}b$ decay parameters without modifying flavour physics observables, is identified. We also present an analysis of the mixed scenario, where the top quark mass is generated due to Partial Compositeness while the light quark masses are Technicolor-like.

arXiv commentImprovement of the discussion on $\Delta F=2$ operators

References in corpus (63)

• The Minimal Composite Higgs Model
• Bounding scalar operator dimensions in 4D CFT
• The Strongly-Interacting Light Higgs
• The Twin Higgs: Natural Electroweak Breaking from Mirror Symmetry
• Higgs as a Holographic Pseudo-Goldstone Boson
• A custodial symmetry for Zbb
• Electroweak symmetry breaking after LEP1 and LEP2
• The Electroweak Fit of the Standard Model after the Discovery of a New Boson at the LHC
• Measurement of the B(s) to mu+ mu- branching fraction and search for B0 to mu+ mu- with the CMS Experiment
• Measurement of the $B_s^0\to {\mu }^{+}{\mu }^{-}$ branching fraction and search for $B^0\to {\mu }^{+}{\mu }^{-}$ decays at the LHCb experiment
• Beyond the Minimal Composite Higgs Model
• Warped/Composite Phenomenology Simplified
• U(2) and Minimal Flavour Violation in Supersymmetry
• Carving Out the Space of 4D CFTs
• Fermionic UV completions of Composite Higgs models
• Light Top Partners for a Light Composite Higgs
• The Other Natural Two Higgs Doublet Model
• A First Top Partner Hunter's Guide
• General Composite Higgs Models
• On the effect of resonances in composite Higgs phenomenology
• Flavour physics from an approximate U(2)^3 symmetry
• Heavy Vector Triplets: Bridging Theory and Data
• UV descriptions of composite Higgs models without elementary scalars
• On the Standard Model prediction for BR(B{s,d} to mu+ mu-)
• Composite Scalar Dark Matter
• On the Tuning and the Mass of the Composite Higgs
• Light top partners and precision physics
• The Discrete Composite Higgs Model
• Left-handed Z' and Z FCNC quark couplings facing new b -> s mu^+ mu^- data
• Discovering the top partners at the LHC using same-sign dilepton final states
• The Composite Higgs and Light Resonance Connection
• Effective description of quark mixing
• On Partial Compositeness and the CP asymmetry in charm decays
• Implications of a Light Higgs in Composite Models
• UV Completions of Partial Compositeness: The Case for a SU(4) Gauge Group
• The 4D Composite Higgs
• Flavor and CP Invariant Composite Higgs Models
• A GIM Mechanism from Extra Dimensions
• Improved bounds for CFT's with global symmetries
• What if the Higgs couplings to W and Z bosons are larger than in the Standard Model?
• Search for top-quark partners with charge 5/3 in the same-sign dilepton final state
• Probing New Physics with the B_s to μ+ μ- Time-Dependent Rate
• Strong Higgs Interactions at a Linear Collider
• On the Interpretation of Top Partners Searches
• Higgs Couplings and Precision Electroweak Data
• A 125 GeV composite Higgs boson versus flavour and electroweak precision tests
• Anatomy of flavour-changing Z couplings in models with partial compositeness
• Modified Higgs Physics from Composite Light Flavors
• UV Completions of Composite Higgs Models with Partial Compositeness
• Composite MFV and Beyond
• Hunting composite vector resonances at the LHC: naturalness facing data
• Composite Dark Matter and LHC Interplay
• Composite fermions in Electroweak Symmetry Breaking
• Strong Signatures of Right-Handed Compositeness
• On the Flavor Structure of Natural Composite Higgs Models & Top Flavor Violation
• Universal Constraints on Low-Energy Flavour Models
• Light Non-degenerate Composite Partners at the LHC
• Vector-like Bottom Quarks in Composite Higgs Models
• Dipole operator constraints on composite Higgs models
• Composite Charge 8/3 Resonances at the LHC
• Radiative corrections to the composite Higgs mass from a gluon partner
• Top couplings and top partners
• Non Minimal Terms in Composite Higgs Models and in QCD

Cited by in corpus (29)

• The Composite Nambu-Goldstone Higgs
• The Twin Higgs mechanism and Composite Higgs
• Gauge theories of Partial Compositeness: Scenarios for Run-II of the LHC
• B-decay anomalies in Pati-Salam SU(4)
• Fundamental Composite 2HDM: SU(N) with 4 flavours
• Fundamental Composite Electroweak Dynamics: Status at the LHC
• Light scalars in composite Higgs models
• Flavor hierarchies from dynamical scales
• Direct and indirect signals of natural composite Higgs models
• Di-boson signatures as Standard Candles for Partial Compositeness
• Fundamental partial compositeness
• Minimally extended SILH
• Effective potential in ultraviolet completions for composite Higgs models
• Top Partners Searches and Composite Higgs Models
• Composite spin-1 resonances at the LHC
• A model for the Singlet-Triplet Leptoquarks
• The top-quark window on compositeness at future lepton colliders
• High-Temperature Electroweak Symmetry Breaking by SM Twins
• E6 inspired composite Higgs model
• Probing light top partners with CP violation
• Collider and astrophysical signatures of light scalars with enhanced $\tau$ couplings
• The Techni-Pati-Salam Composite Higgs
• Anarchy with linear and bilinear interactions
• Top partner-resonance interplay in a composite Higgs framework
• LHC signatures of neutral pseudo-Goldstone boson in the E6CHM
• Exploring the Flavor Symmetry Landscape
• Dilaton at the LHC: Complementary Probe of Composite Higgs
• LHC vector resonance searches in the $t\bar{t}Z$ final state
• Light new physics and the $\tau$ lepton dipole moments: prospects at Belle II