Search for four-top-quark production in the single-lepton and opposite-sign dilepton final states in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector - INSPIRE

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Search for four-top-quark production in the single-lepton and opposite-sign dilepton final states in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

ATLAS

Collaboration

Nov 6, 2018

36 pages

Published in:

Phys.Rev.D 99 (2019) 5, 052009

Published: Mar 27, 2019

e-Print:

1811.02305 [hep-ex]

DOI:

10.1103/PhysRevD.99.052009 (publication)

PDG:

{{\mathit t}}{{\overline{\mathit t}}}{{\mathit t}}{{\overline{\mathit t}}}

Production Cross Section in

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

\sqrt {s }

Report number:

CERN-EP-2018-174

Experiments:

CERN-LHC-ATLAS

View in:

reference search97 citations

Citations per year

Abstract: (APS)

A search for four-top-quark production, tt¯tt¯, is presented. It is based on proton-proton collision data with a center-of-mass energy s=13 TeV collected by the ATLAS detector at the Large Hadron Collider during the years 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb-1. Data are analyzed in both the single-lepton and opposite-sign dilepton channels, characterized by the presence of one or two isolated electrons or muons with high-transverse momentum and multiple jets. A data-driven method is used to estimate the dominant background from top-quark pair production in association with jets. No significant excess above the Standard Model expectation is observed. The result is combined with the previous same-sign dilepton and multilepton searches carried out by the ATLAS Collaboration and an observed (expected) upper limit of 5.3 (2.1) times the four-top-quark Standard Model cross section is obtained at 95% confidence level. Additionally, an upper limit on the anomalous four-top-quark production cross section is set in the context of an effective field theory model.

Note:

52 pages in total, author list starting page 36, 11 figures, 2 tables, submitted to Phys. Rev. D. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2017-11 •
Submitted to Phys.Rev.

Particle Physics Experiments
p p: colliding beams
top: pair production
top: multiple production
p p: scattering
final state: ((n)jet lepton)
final state: ((n)jet dilepton)
dilepton: same sign
ATLAS
effective field theory

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