Search for single production of vector-like quarks decaying into $W(\ellν)b$ in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

ATLAS Collaboration

doi:10.1007/JHEP12(2025)012

paper

Search for single production of vector-like quarks decaying into $W (ℓ ν) b$ in $pp$ collisions at $s = 13$ TeV with the ATLAS detector

arXiv:2506.15515 · doi:10.1007/JHEP12(2025)012

Abstract

A search for single production of a vector-like quark $Q$ , which could be either a singlet $T$ , with charge $\frac{2}{3}$ , or a $Y$ from a $(T, B, Y)$ triplet, with charge $- \frac{4}{3}$ , is performed using data from proton-proton collisions at a centre-of-mass energy of 13 TeV. The data correspond to the full integrated luminosity of 140 fb $^{- 1}$ recorded with the ATLAS detector during Run~2 of the Large Hadron Collider. The analysis targets $Q \to W b$ decays where the $W$ boson decays leptonically. The data are found to be consistent with the expected Standard Model background, so upper limits are set on the cross-section times branching ratio, and on the coupling of the $Q$ to the Standard Model sector for these two benchmark models. Effects of interference with the Standard Model background are taken into account. For the singlet $T$ , the 95% confidence level limit on the coupling strength $κ$ ranges between 0.22 and 0.52 for masses from 1150 to 2300 GeV. For the $(T, B, Y)$ triplet, the limits on $κ$ vary from 0.14 to 0.46 for masses from 1150 to 2600 GeV.

arXiv comment53 pages in total, author list starting page 36, 6 figures, 8 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-60

Search for single production of vector-like quarks decaying into W(ℓν)b in pp collisions at s​=13 TeV with the ATLAS detector

Abstract

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Search for single production of vector-like quarks decaying into $W (ℓ ν) b$ in $pp$ collisions at $s = 13$ TeV with the ATLAS detector