Search for pair-production of vector-like quarks in lepton+jets final states containing at least one b-tagged jet using the Run 2 data from the ATLAS experiment - INSPIRE

Search for pair-production of vector-like quarks in lepton+jets final states containing at least one b-tagged jet using the Run 2 data from the ATLAS experiment

ATLAS

Collaboration

Jan 30, 2024

28 pages

Published in:

Phys.Lett.B 854 (2024) 138743

Published: May 23, 2024

e-Print:

2401.17165 [hep-ex]

DOI:

10.1016/j.physletb.2024.138743 (publication)

Report number:

CERN-EP-2023-254

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (Elsevier B.V.)

A search is presented for the pair-production of heavy vector-like quarks in the lepton+jets final state using 140 fb⁻¹ of proton–proton collisions at

\sqrt{s} = 13

TeV collected with the ATLAS detector. The search is optimised for vector-like top-quarks (T) that decay into a W boson and a b-quark, with one W boson decaying leptonically and the other hadronically. Other vector-like quark flavours and decay modes are also considered. Events are selected with one high transverse-momentum electron or muon, large missing transverse momentum, a large-radius jet identified as a W boson, and multiple small-radius jets, at least one of which is b-tagged. Vector-like T-quarks with 100% branching ratio to Wb are excluded at 95% CL for masses below 1700 GeV. These limits are also applied to vector-like Y-quarks, which decay exclusively into a W boson and a b-quark. Isospin singlets with

B (T \to W b : H t : Z t) = 1 / 2 : 1 / 4 : 1 / 4

are excluded for masses below 1360 GeV.

Note:

All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2019-06/

p p: colliding beams
quark: vector particle
isospin: singlet
transverse momentum: missing-energy
quark: flavor
electron: transverse momentum
transverse momentum: high
p p: scattering
quark: pair production
quark: decay modes

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