Search for pair-produced vector-like top and bottom partners in events with large missing transverse momentum in pp collisions with the ATLAS detector
Metadatos
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Springer Nature
Fecha
2023-08-10Referencia bibliográfica
Aad, G., Abbott, B., Abbott, D.C. et al. Search for pair-produced vector-like top and bottom partners in events with large missing transverse momentum in pp collisions with the ATLAS detector. Eur. Phys. J. C 83, 719 (2023). [https://doi.org/10.1140/epjc/s10052-023-11790-7]
Patrocinador
EU-ESF; GenT Programmes Generalitat Valenciana, Spain; La Caixa Banking Foundation; PROMETEO; H2020 Marie Skłodowska-Curie Actions MSCA; CERN; European Research Council ERC; European Cooperation in Science and Technology COST; Generalitat de Catalunya; Agencia Nacional de Promoción Científica y Tecnológica ANPCyT; Ministerio de Ciencia e Innovación MICINN; Horizon 2020; European Regional Development Fund ERDF; Agencia Nacional de Investigación y Desarrollo ANID; PIC (Spain)Resumen
A search for pair-produced vector-like quarks using events with exactly one lepton (e or μ), at least four jets including at least one b-tagged jet, and large missing transverse momentum is presented. Data from proton–proton collisions at a centre-of-mass energy of s= 13 TeV , recorded by the ATLAS detector at the LHC from 2015 to 2018 and corresponding to an integrated luminosity of 139 fb - 1 , are analysed. Vector-like partners T and B of the top and bottom quarks are considered, as is a vector-like X with charge + 5 / 3 , assuming their decay into a W, Z, or Higgs boson and a third-generation quark. No significant deviations from the Standard Model expectation are observed. Upper limits on the production cross-section of T and B quark pairs as a function of their mass are derived for various decay branching ratio scenarios. The strongest lower limits on the masses are 1.59 TeV assuming mass-degenerate vector-like quarks and branching ratios corresponding to the weak-isospin doublet model, and 1.47 TeV (1.46 TeV) for exclusive T→ Zt (B/ X→ Wt) decays. In addition, lower limits on the T and B quark masses are derived for all possible branching ratios.