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Search for pair-produced vector-like quarks coupling to light quarks in the lepton plus jets final state using 13 TeV $pp$ collisions with the ATLAS detector
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abstract
A search is presented for the pair-production of heavy vector-like quarks (VLQs) that each decay into a $W$ boson and a light quark. This study focuses on events where one $W$ boson decays into leptons and the other into hadrons. The search analyzed 140 fb$^{-1}$ of $pp$ collision data with $\sqrt{s} = 13$ TeV, recorded by the ATLAS detector from 2015 to 2018 during Run 2 of the Large Hadron Collider. The final state is characterized by a high-transverse-momentum isolated electron or muon, large missing transverse momentum, multiple small-radius jets, and a single large-radius jet identified as originating from the hadronic decay of a boosted $W$ boson. With higher center-of-mass energy and integrated luminosity than in the Run 1 search, and improved analysis tools, this analysis excludes VLQs ($Q$) with masses below 1530 GeV at 95% CL for the branching ratio ${{\cal B}(Q \to Wq)} = 1$, an improvement of 840 GeV on the previous ATLAS limit.
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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Vector-like quark doublets, weak-basis invariants and CP violation
Vector-like quark doublets allow CP violation in weak-basis invariants of mass dimension six; the resulting framework organizes the model's parameters, gives the complete CP-odd invariant set for one doublet, and link...
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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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Flavor constraints from $pp\to Vh$ and $pp\to VW$ at the LHC
LHC data on pp→Vh and pp→VW yield general-flavor SMEFT constraints that will become competitive with flavor tests of the Cabibbo-angle anomaly at the HL-LHC.
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