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Search for a vector-like quark T' to tH via the diphoton decay mode of the Higgs boson in proton-proton collisions at sqrt{s} = 13 TeV
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Search for a vector-like quark T' to tH via the diphoton decay mode of the Higgs boson in proton-proton collisions at sqrt{s} = 13 TeV
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A search for the electroweak production of a vector-like quark T$'$, decaying to a top quark and a Higgs boson is presented. The search is based on a sample of proton-proton collision events recorded at the LHC at $\sqrt{s}$ = 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. This is the first T$'$ search that exploits the Higgs boson decay to a pair of photons. For narrow isospin singlet T$'$ states with masses up to 1.1 TeV, the excellent diphoton invariant mass resolution of 1-2% results in an increased sensitivity compared to previous searches based on the same production mechanism. The electroweak production of a T$'$ quark with mass up to 960 GeV is excluded at 95% confidence level, assuming a coupling strength $\kappa_\mathrm{T}$ = 0.25 and a relative decay width $\Gamma/M_{\mathrm{T}'}$ $\lt$ 5%.
Forward citations
Cited by 4 Pith papers
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Search for single production of a vector-like T quark decaying to a top quark and a neutral scalar boson in the lepton+jets final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No evidence of a single vector-like T quark decaying to a top quark plus a neutral scalar is found; new 95% CL exclusion limits are set, first for the new-scalar channel.
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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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VLQBounds: Confronting Vector-Like Quark Models with LHC Searches
VLQBounds is a modular Python tool that compares VLQ parameter points to LHC pair and single production limits via grid interpolation and returns 95% CL exclusion verdicts.
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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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