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Common exotic decays of top partners
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abstract
Many standard model extensions that address the hierarchy problem contain Dirac-fermion partners of the top quark, which are typically expected around the TeV scale. Searches for these vector-like quarks mostly focus on their decay into electroweak gauge bosons and Higgs plus a standard model quark. In this article, backed by models of composite Higgs, we propose a set of simplified scenarios, with effective Lagrangians and benchmarks, that include more exotic decay channels, which modify the search strategies and affect the bounds. Analysing several classes of underlying models, we show that exotic decays are the norm and commonly appear with significant rates. All these models contain light new scalars that couple to top partners with charge $5/3$, $2/3$, and $-1/3$.
Forward citations
Cited by 8 Pith papers
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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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Search for pair production of heavy resonances in final states with a photon and large-radius jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
Using 138 fb^-1 of CMS data, the first tt-gamma-g channel search finds no excess and excludes spin-1/2 (spin-3/2) excited top quarks below 930 (1330) GeV.
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Tagging fully hadronic exotic decays of the vectorlike $\mathbf{B}$ quark using a graph neural network
A GNN-based search could give the HL-LHC an exclusion reach near 2.4 TeV for vectorlike B quarks decaying fully hadronically through b plus a singlet scalar, with performance comparable to semileptonic searches.
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Meson spectroscopy in the $Sp(4)$ gauge theory with three antisymmetric fermions
Lattice simulations of Sp(4) with three antisymmetric Dirac fermions find QCD-like confinement and chiral symmetry breaking, and provide a first continuum-extrapolated meson spectrum.
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Electroweak phase transition with composite Higgs models: calculability, gravitational waves and collider searches
A strong first-order electroweak phase transition is impossible in SO(6)/SO(5) composite Higgs models under the minimal Higgs potential hypothesis, and requires undetermined UV operator contributions, as shown in a 6+...
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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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Dark matter in composite Higgs models with a scotogenic EFT
In the SU(6)/Sp(6) composite Higgs model with a scotogenic Z2, three of four neutral pseudo-Goldstone dark matter candidates can reproduce the observed relic density, while the SU(2)L triplet candidate fails; spin-1 r...
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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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