Light custodians in natural composite Higgs models

By Roberto Contino, L. Rold, A. Pomarol. 2006

579 citations recorded by the source corpus.

We present a class of composite Higgs models arising from a warped extra dimension that can satisfy all the electroweak precision tests in a significant portion of their parameter space. A custodial symmetry plays a crucial role in keeping the largest corrections to the electroweak observables below their experimental limits. In these models the heaviness of the top quark is not only essential to trigger the electroweak symmetry breaking, but it also implies that the lowest top resonance and its custodial partners, the custodians, are significantly lighter than the other resonances. These custodians are the trademark of these scenarios. They are exotic colored fermions of electromagnetic charges 5/3, 2/3, and -1/3, with masses predicted roughly in the range 500-1500 GeV. We discuss their production and detection at the CERN LHC.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b1b83f4aa1663d52444396d86b44ff5dc0fd4bf6

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Citations in the corpus

Non-resonant new physics in top pair production at hadron colliders (2010, background): “J H E P 0 3 ( 2 0 1 1 ) 1 2 5 Finally, note that a generic prediction of recent models of Higgs and top compositeness is the existence of fermionic top partners (“custodians”) whose mass is below the mass scale of the vector resonances mρ [48–50].”
Composite leptoquarks and anomalies in B-meson decays (2014, result): “Happily, we find thanks to mρ ∼ 10TeV and to the presence of light custodians [47, 48], we are consistent with the bounds coming from EWPT observables.”
Higgs boson from an extended symmetry (2007, methodology): “In the last case, this is precisely the model already discussed in [3, 4], whereas the little Higgs extension corresponds to the “deconstructed” version of the same model.”
Discovering the top partners at the LHC using same-sign dilepton final states (2008, background): “[23], which reproduces the low-energy regime of the 5D models of [13, 14] (see also [24] for an alternative 4D construction).”
Composite scalar dark matter (2012, result): “[58]); in the following we neglect for simplicity these terms, when compared to the ci ones.”
The 4D composite Higgs (2011, methodology): “As an example we considered in detail the CHM5 scenario of [21] with results comparable to the 5D scenario for similar choices of parameters.”
Rare K and B Decays in a warped extra dimension with custodial protection (2008, methodology): “In our numerical analysis we will use f = 1 TeV.”
Probing the Standard Model with Higgs signal rates from the Tevatron, the LHC and a future ILC (2014, background): “This coupling pattern occurs, for example, in minimal composite Higgs models [125–127], where the Higgs couplings to fermions and vector bosons can be suppressed with different factors.”
The flavor of the composite pseudo-goldstone Higgs (2008, background): “[28] but the physical content of the model is similar.”
The composite twin Higgs scenario (2015, background): “This eliminates one possible signature of Composite Higgs models, namely the production of colored Partners of the Top quark [21], which need to be light in the ordinary constructions [22–24] .”
Composite Higgs boson pair production at the LHC (2010, methodology): “[47, 48 ]. With mild tuning, they are consistent with electroweak precision tests (EWPT).”
Effective Lagrangian for a light Higgs-like scalar (2013, methodology): “The last two columns of table 1 report the predictions of the Minimal Composite Higgs Model MCHM4 [13] and MCHM5 [52], where the SM fermions couple linearly to composite operators transforming as the spinorial and fundamental representations of SO(5), respectively.”