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

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

ATLAS

Collaboration

Dec 10, 2022

46 pages

Published in:

Eur.Phys.J.C 83 (2023) 8, 719

Published: Aug 10, 2023

e-Print:

2212.05263 [hep-ex]

DOI:

10.1140/epjc/s10052-023-11790-7

PDG:

{{\mathit b}^{\,'}}(-1

/3)-quark/hadron mass limits in

{{\mathit p}}{{\overline{\mathit p}}}

{{\mathit p}}{{\mathit p}}

Report number:

CERN-EP-2022-201

Experiments:

CERN-LHC-ATLAS,
CERN-LHC-ATLAS

View in:

reference search43 citations

Citations per year

Abstract: (Springer)

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.

Note:

46 pages in total, author list starting page 29, 8 figures, 5 tables, published in Eur. Phys. J. C 83 (2023) 719. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2019-08/

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

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