A minimally tuned composite Higgs model from an extra dimension

Abstract

We construct and study the 5D realization of a composite Higgs model with minimal tuning. The Higgs is a (pseudo-)Goldstone boson from the spontaneous breaking of a global SO(5) symmetry to an SO(4) subgroup. The peculiarity of our construction lies in the specific choice of the SO(5) representations of the 5D fermions from which the Standard Model fields arise as chiral zero modes. This choice reduces the tuning of these models to the minimal model-independent value allowed by electroweak precision tests. We analyse the main differences between our 5D construction and other descriptions in terms of purely 4D field theories. 5D models are generally more constrained and show a generic difficulty in accommodating a light Higgs without reintroducing large corrections to the \hat{S} parameter. We propose a specific construction in which this tension can be, even though accidentally, relaxed. We discuss the spectrum of the top partners in the viable regions of parameter space and predict the existence of light exotic quarks, Υ, of charge 8/3 whose striking decay channel Υ\to W^+W^+W^+ b can lead to either exclusion or confirmation of the model in the near future.

34 pages, 5 figures and 2 tables; published version

References in corpus (8)

• A custodial symmetry for Zbb
• Light custodians in natural composite Higgs models
• The Higgs boson from an extended symmetry
• Tasi 2009 lectures: The Higgs as a Composite Nambu-Goldstone Boson
• On Partial Compositeness and the CP asymmetry in charm decays
• Implications of a Light Higgs in Composite Models
• Living Dangerously with Low-Energy Supersymmetry
• Simple and Realistic Composite Higgs Models in Flat Extra Dimensions

Cited by in corpus (13)

• Strong Higgs Interactions at a Linear Collider
• How well do we need to measure the Higgs boson mass and self-coupling?
• Modified Higgs Physics from Composite Light Flavors
• Vector-like Bottom Quarks in Composite Higgs Models
• Towards the fate of natural composite Higgs model through single $t^{\prime }$ search at the 8 TeV LHC
• Radiative corrections to the composite Higgs mass from a gluon partner
• The Effect of Composite Resonances on Higgs decay into two photons
• Sigma Decomposition: The CP-Odd Lagrangian
• E6 inspired composite Higgs model
• Baryon asymmetry generation in the E6CHM
• Anarchic Yukawas and top partial compositeness: the flavour of a successful marriage
• Composite Resonances effects on EWPT and Higgs diphoton decay rate
• Higgs boson coupling to a new strongly interacting sector