Scientific article
OA Policy
English

Search for pair-produced vector-like top and bottom partners in events with large missing transverse momentum in pp collisions with the ATLAS detector

ContributorsATLAS Collaboration
Publication date2023
First online date2023-08-10
Abstract

A search for pair-produced vector-like quarks using events with exactly one lepton (e or $\mu $), 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 $\sqrt{s}=$13 $\text {TeV}$, 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 $\text {TeV}$ assuming mass-degenerate vector-like quarks and branching ratios corresponding to the weak-isospin doublet model, and 1.47 $\text {TeV}$ (1.46 $\text {TeV}$) for exclusive $T \rightarrow Zt$ ($B/X \rightarrow Wt$) decays. In addition, lower limits on the T and B quark masses are derived for all possible branching ratios.

Keywords
  • P p: colliding beams
  • Transverse momentum: missing-energy
  • P p: scattering
  • Quark: postulated particle
  • Quark: pair production
  • Quark: vector particle
  • Family: 3
  • Quark: mass: lower limit
  • Quark: decay modes
  • Quark: branching ratio
  • ATLAS
  • Charge: 5/3
  • Final state: ((n)jet lepton)
  • Jet: bottom
  • Bottom: particle identification
  • CERN LHC Coll
  • Higgs particle
  • W
  • Z0
  • Doublet
  • Channel cross section: upper limit
  • Mass dependence
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for pair-produced vector-like top and bottom partners in events with large missing transverse momentum in pp collisions with the ATLAS detector. In: European physical journal. C, Particles and fields, 2023, vol. 83, n° 8, p. 719. doi: 10.1140/epjc/s10052-023-11790-7
Main files (1)
Article (Published version)
Identifiers
Journal ISSN1434-6044
38views
20downloads

Technical informations

Creation28/05/2024 17:50:15
First validation18/06/2024 16:54:58
Update time18/06/2024 16:54:58
Status update18/06/2024 16:54:58
Last indexation11/03/2025 16:05:39
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack