Collaboration, ATLAS
(2021)
Measurement of the $t\bar{t}t\bar{t}$ production cross section in $pp$
collisions at $\sqrt{s}$=13 TeV with the ATLAS detector.
JHEP, 11 (3).
118-.
Abstract
A measurement of four-top-quark production using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 139 fb$^{-1}$ is presented. Events are selected if they contain a single lepton (electron or muon) or an opposite-sign lepton pair, in association with multiple jets. The events are categorised according to the number of jets and how likely these are to contain $b$-hadrons. A multivariate technique is then used to discriminate between signal and background events. The measured four-top-quark production cross section is found to be 26$^{+17}_{-15}$ fb, with a corresponding observed (expected) significance of 1.9 (1.0) standard deviations over the background-only hypothesis. The result is combined with the previous measurement performed by the ATLAS Collaboration in the multilepton final state. The combined four-top-quark production cross section is measured to be 24$^{+7}_{-6}$ fb, with a corresponding observed (expected) signal significance of 4.7 (2.6) standard deviations over the background-only predictions. It is consistent within 2.0 standard deviations with the Standard Model expectation of 12.0$\pm$2.4 fb.
| Item Type: | Article |
|---|---|
| Additional Information: | 52 pages total, author list starting page 36, 12 figures, 3 tables, Published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2020-10/ |
| Uncontrolled Keywords: | hep-ex, hep-ex |
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 16 Feb 2024 09:32 |
| Last Modified: | 16 Feb 2024 09:34 |
| DOI: | 10.1007/jhep03(2020)054 |
| Open Access URL: | https://link.springer.com/article/10.1007/JHEP11(2... |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3178722 |
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