Search for single vector-like B quark production and decay via B → bH( b b ¯ $$ b\overline{b} $$ ) in pp collisions at s $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector

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Aad, G.
Abbott, B.
Abbott, D. C.
Abed Abud, A.
Abeling, K.
Abhayasinghe, D. K.
Abidi, S. H.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.

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2023-11-23

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Journal Article

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Abstract 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 b ¯ $$ b\overline{b} $$ pair. The search is carried out in 139 fb−1 of s $$ \sqrt{s} $$ = 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 cW, cZ and cH 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 cW greater than 0.45 for a B resonance mass (mB) between 1.0 and 1.2 TeV. For 1.2 TeV < mB < 2.0 TeV, cW values larger than 0.50–0.65 are excluded. If the B occurs as part of a (B, Y) doublet, the smallest excluded cZ coupling values range between 0.3 and 0.5 across the investigated resonance mass range 1.0 TeV < mB < 2.0 TeV.

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Journal of High Energy Physics. 2023 Nov 23;2023(11):168

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