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Novel signatures for vector-like quarks
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abstract
We consider supersymmetric extensions of the standard model with a vector-like doublet $(T \, B)$ of quarks with charge $2/3$ and $-1/3$, respectively. Compared to non-supersymmetric models, there is a variety of new decay modes for the vector-like quarks, involving the extra scalars present in supersymmetry. The importance of these new modes, yielding multi-top, multi-bottom and also multi-Higgs signals, is highlighted by the analysis of several benchmark scenarios. We show how the triangles commonly used to represent the branching ratios of the `standard' decay modes of the vector-like quarks involving $W$, $Z$ or Higgs bosons can be generalised to include additional channels. We give an example by recasting the limits of a recent heavy quark search for this more general case.
Forward citations
Cited by 4 Pith papers
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Vector-like quarks with non-renormalizable interactions
Dropping renormalizability in effective theories of vector-like quarks opens five new multiplet types whose widths can be so suppressed that the quarks become long-lived R-hadrons at the LHC.
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Search for pair-production of vector-like $T$ quarks decaying into a top quark and a spin-0 particle in the diphoton final state in proton proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
No excess is observed in a first ATLAS search for pair-produced vector-like T quarks decaying via an exotic spin-0 particle to diphotons; fiducial cross-section limits and a model exclusion up to m_T≈1620 GeV are set.
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Exotic decays of top partners: mind the search gap
A top-partner search gap exists: for T -> t a with a -> gg, current LHC bounds drop from about 1.3 TeV to roughly 400-550 GeV.
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Non-standard decays of vector-like top partners in a $2$-Higgs doublet model at the HL-LHC
Collider analysis shows the 2τ + 2b + MET channel can probe vector-like top partners up to 1.9 TeV in 2HDM scenarios at HL-LHC.
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