Light top partners for a light composite Higgs
By O. Matsedonskyi, G. Panico, A. Wulzer. 2012
259 citations recorded by the source corpus.
A bstractAnomalously light fermionic partners of the top quark often appear in explicit constructions, such as the 5d holographic models, where the Higgs is a light composite pseudo Nambu-Goldstone boson and its potential is generated radiatively by top quark loops. We show that this is due to a structural correlation among the mass of the partners and the one of the Higgs boson. Because of this correlation, the presence of light partners could be essential to obtain a realistic Higgs mass.We quantitatively confirm this generic prediction, which applies to a broad class of composite Higgs models, by studying the simplest calculable framework with a composite Higgs, the Discrete Composite Higgs Model. In this setup we show analytically that the requirement of a light enough Higgs strongly constraints the fermionic spectrum and makes the light partners appear.The light top partners thus provide the most promising manifestation of the composite Higgs scenario at the LHC. Conversely, the lack of observation of these states can put strong restrictions on the parameter space of the model. A simple analysis of the 7-TeV LHC searches presently available already gives some non-trivial constraint. The strongest bound comes from the exclusion of the 5/3-charged partner. Even if no dedicated LHC search exists for this particle, a bound of 611 GeV is derived by adapting the CMS search of bottom-like states in same-sign dileptons.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/4e7e62db515305015ab2e585711c8dde776d2bed
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In Nuclear and High Energy Physics
Citations in the corpus
- Composite leptoquarks and anomalies in B-meson decays (2014, background): “15 Very roughly, the amount of tuning needed to accommodate the right values of the EW scale and of the Higgs mass [77–81] is expected to be, at best, at or below the per cent level, which is not much worse than the amount already required in generic supersymmetric extensions of the SM, given curren”
- On the tuning and the mass of the composite Higgs (2012, background): “[12], the peculiar structure of the effective potential in the CHM5 implies the following relation between the Higgs mass and the mass of the lightest composite fermions which mix directly to the top 8 m(2)h ' Nc π2 m(2)t f 2 m221/6 m 2 12/3 m221/6 −m(2)12/3 log m221/6 m212/3 , (51) where m12/3 and ”
- Light top partners and precision physics (2013, background): “In this way the Higgs mass becomes calculable and an interesting relation between mh and the masses of the top partners holds [13]:”
- The Composite Nambu-Goldstone Higgs (2015, background): “For this reason it is worth introducing a new mass scale mψ (with its associated coupling gψ = mψ/f) that characterizes the fermionic states [112, 128, 129].”
- Doubling down on naturalness with a supersymmetric twin Higgs (2013, background): “where the Higgs mass is protected by a global symmetry and heavy resonances lie in the multi-TeV range – but even here, one expects light fermionic top partners to accommodate the observed Higgs mass [5], as well as copious production of heavy resonances in the second LHC run. Moreover, such models ”
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- A first top partner hunter’s guide (2012, methodology): “For instance by uplifting our multiplet Ψ to a full split SO(5) multiplet, like in a two site model, we could make the Higgs potential only logarithmically divergent, thus controlling its size in leading log approximation, and making the rough connection between MΨ and naturalness more explicit alon”
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- Electroweak phase transition and baryogenesis in composite Higgs models (2018, background): “to be of order one and N c is the number of SM QCD colors enhancing the quark loops. A non-zero p means that the leading contribution to the coecient is suppressed with respect to the naive estimate [11,24]. In the known composite Higgs models one can have p = 0;2. For instance, contributions with p”