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Search for single vector-like B quark production and decay via Brightarrow bH(bbar{b}) in pp collisions at sqrt{s} = 13 TeV with the ATLAS detector
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Search for single vector-like B quark production and decay via Brightarrow bH(bbar{b}) in pp collisions at sqrt{s} = 13 TeV with the ATLAS detector
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A search is presented for single production of a vector-like $B$ quark decaying into a Standard Model $b$-quark and a Standard Model Higgs boson, which decays into a $b\bar{b}$ pair. The search is carried out in 139 fb$^{-1}$ of $\sqrt{s} = 13$ TeV proton-proton collision data collected by the ATLAS detector at the LHC between 2015 and 2018. No significant deviation from the Standard Model background prediction is observed, and mass-dependent exclusion limits at the 95% confidence level are set on the resonance production cross-section in several theoretical scenarios determined by the couplings $c_W$, $c_Z$ and $c_H$ between the $B$ quark and the Standard Model $W$, $Z$ and Higgs bosons, respectively. For a vector-like $B$ occurring as an isospin singlet, the search excludes values of $c_W$ greater than 0.45 for a $B$ resonance mass ($m_B$) between 1.0 and 1.2 TeV. For 1.2 TeV < $m_B$ < 2.0 TeV, $c_W$ values larger than 0.50-0.65 are excluded. If the $B$ occurs as part of a $(B,Y)$ doublet, the smallest excluded $c_Z$ coupling values range between 0.3 and 0.5 across the investigated resonance mass range 1.0 TeV < $m_B$ < 2.0 TeV.
Forward citations
Cited by 4 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
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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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Probing Heavy Neutral Higgs Bosons via Single Vector-Like Bottom Quark Production at the HL-LHC
XGBoost multivariate analysis extends the 5-sigma discovery reach for singly produced vector-like bottom quarks decaying via heavy neutral Higgs bosons to 1.6 TeV at the HL-LHC with 3 ab^{-1}.
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Track and Vertex Reconstruction with the ATLAS Inner Detector
ATLAS Inner Detector track and vertex reconstruction maintains high efficiency, good resolution, and low fake rates for up to 80 simultaneous proton-proton interactions in Run 2 and Run 3 data and simulations.
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