Search for pair-produced vector-like top and bottom partners in events with large missing transverse momentum in pp collisions with the ATLAS detector
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Archivos
Fecha
2023-08
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Institute for Ionics
Nombre de Curso
Licencia CC
Attribution 4.0 International Deed (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/
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. © 2023, The Author(s).
Notas
Indexación: Scopus
Palabras clave
Bottom, Collisions, Lepton (e or μ), The ATLAS detector, LHC, Bottom Quarks, Mass energy of s= 13 TeV
Citación
European Physical Journal C. Volume 83, Issue 8. August 2023. Article number 719
DOI
10.1140/epjc/s10052-023-11790-7