Abstract
Many composite Higgs models predict the existence of vector-like quarks with masses outside the reach of the LHC, e.g. mQ ≳ 2 TeV, in particular if these models contain a dark matter candidate. In such models the mass of the new resonances is bounded from above to satisfy the constraint from the observed relic density. We therefore develop new strategies to search for vector-like quarks at a future 100 TeV collider and evaluate what masses and interactions can be probed. We find that masses as large as ∼ 6.4 (∼9) TeV can be tested if the fermionic resonances decay into Standard Model (dark matter) particles. We also discuss the complementarity of dark matter searches, showing that most of the parameter space can be closed. On balance, this study motivates further the consideration of a higher-energy hadron collider for a next generation of facilities.
Highlights
ParametrizationOnly a particular combination of these coefficients enter into physical observables, e.g. the Dark Matter (DM) annihilation cross section (see below)
It is conceivable that VLQs might not be discovered at the LHC and new facilities will be required to probe such models. This conclusion can be further strengthened by exploring non-minimal CHMs containing extra stable pNGBs that can play the role of Dark Matter (DM) particles. These models are well motivated by two main reasons. (i) One single mechanism explains why the electroweak (EW) and the DM scales are of the same order, as suggested by the WIMP paradigm. (ii) The Higgs boson can have naturally small portal couplings to the pNGB DM, which evades the strong constraints from low-energy direct detection experiments
We have shown that collider searches for vector-like quarks at the LHC and future colliders can bound the parameter region that is complementary to the one bounded by the measurement of the relic density
Summary
Only a particular combination of these coefficients enter into physical observables, e.g. the DM annihilation cross section (see below). This parametrization is simple, predictive, yet flexible enough, and it can comprise very different CHMs. This parametrization is simple, predictive, yet flexible enough, and it can comprise very different CHMs It reflects the expected power counting in these setups [27, 28]. As a matter of fact, the former depends only on the mass of the VLQs, which is just given by mρ ∼ gρf The number of such resonances and their charges depend crucially on the coset structure. BR(T, X2/3 → ht) ∼ BR(T, X2/3 → Zt) ∼ 0.5 , BR(B → W −t) ∼ BR(X5/3 → W +t) ∼ BR(T → St) ∼ 1
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