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Measurement of the tt̄tt̄ production cross section in pp collisions at √s = 13 TeV with the ATLAS detector
 

Measurement of the tt̄tt̄ production cross section in pp collisions at √s = 13 TeV with the ATLAS detector

J. R. Bensinger, C. Blocker, G. Sciolla The ATLAS Collaboration
Journal of high energy physics : JHEP, Vol.2021(11), pp.1-53
11/16/2021
: https://doi.org/10.1007/JHEP11(2021)118
:
https://hdl.handle.net/10192/61957
Classical and Quantum Gravitation Elementary Particles Physics and Astronomy Quantum Field Theories Regular Article - Experimental Physics Relativity Theory Physics Quantum Field Theory Quantum Physics String Theory
A bstract 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 − 15 + 17 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 − 6 + 7 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 ± 2 . 4 fb.
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