A search is presented for four-top-quark production using an integrated luminosity of 139 fb−1 of proton– proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the LHC. Events are selected if they contain a same-sign lepton pair or at least three leptons (electrons or muons). Jet multiplicity, jet flavour and event kinematics are used to separate signal from the background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The four-top-quark production cross section is measured to be 24+7−6 fb. This corresponds to an observed (expected) significance with respect to the background-only hypothesis of 4.3 (2.4) standard deviations and provides evidence for this process.

Aad G., A.B. (2020). Evidence for tt¯tt¯ production in the multilepton final state in proton–proton collisions at √s=13 TeV with the ATLAS detector. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 80(11), 1-32 [10.1140/epjc/s10052-020-08509-3].

Evidence for tt¯tt¯ production in the multilepton final state in proton–proton collisions at √s=13 TeV with the ATLAS detector

Alberghi G. L.;Alfonsi F.;Bellagamba L.;Bindi M.;Boscherini D.;Cabras G.;Caforio D.;Carratta G.;De Castro S.;Fabbri F.;Fabbri L.;Franchini M.;Gabrielli A.;Giacobbe B.;Macchiolo A.;Massa L.;Monzani S.;Polini A.;Rinaldi L.;Romano M.;Sbarra C.;Sbrizzi A.;Semprini-Cesari N.;Sharma A.;Sioli M.;Todome K.;Valentinetti S.;Villa M.;Vittori C.;Vivarelli I.;Zoccoli A.;
2020

Abstract

A search is presented for four-top-quark production using an integrated luminosity of 139 fb−1 of proton– proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the LHC. Events are selected if they contain a same-sign lepton pair or at least three leptons (electrons or muons). Jet multiplicity, jet flavour and event kinematics are used to separate signal from the background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The four-top-quark production cross section is measured to be 24+7−6 fb. This corresponds to an observed (expected) significance with respect to the background-only hypothesis of 4.3 (2.4) standard deviations and provides evidence for this process.
2020
Aad G., A.B. (2020). Evidence for tt¯tt¯ production in the multilepton final state in proton–proton collisions at √s=13 TeV with the ATLAS detector. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 80(11), 1-32 [10.1140/epjc/s10052-020-08509-3].
Aad G., Abbott B., Abbott D.C., Abud A.A., Abeling K., Abhayasinghe D.K., Abidi S.H., AbouZeid O.S., Abraham N.L., Abramowicz H., Abreu H., Abulaiti Y...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/791171
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