Measurements of top-quark pair differential cross-sections in the e μ channel in pp collisions at √ s = 13 TeV using the ATLAS detector /M. Aaboud, G. Aad, B. Abbott [et.al.]

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Другой Автор
Aaboud, M.
Abbott, B.
Chelkov, G. A.
Aad, G.
Vaniachine, A.
Источник
The European physical journal C 2017 Vol. 77, № 5. P. 292 (1-30)
Аннотация
This article presents measurements of tt¯tt¯ differential cross-sections in a fiducial phase-space region, using an integrated luminosity of 3.2 fb−1−1 of proton–proton data at a centre-of-mass energy of s√=13s=13 TeV recorded by the ATLAS experiment at the LHC in 2015. Differential cross-sections are measured as a function of the transverse momentum and absolute rapidity of the top quark, and of the transverse momentum, absolute rapidity and invariant mass of the tt¯tt¯ system. The tt¯tt¯ events are selected by requiring one electron and one muon of opposite electric charge, and at least two jets, one of which must be tagged as containing a b-hadron. The measured differential cross-sections are compared to predictions of next-to-leading order generators matched to parton showers and the measurements are found to be consistent with all models within the experimental uncertainties with the exception of the Powheg-Box++ Herwig++ predictions, which differ significantly from the data in both the transverse momentum of the top quark and the mass of the tt¯tt¯ system.
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$a Measurements of top-quark pair differential cross-sections in the e μ channel in pp collisions at √ s = 13 TeV using the ATLAS detector $c M. Aaboud, G. Aad, B. Abbott [et.al.]
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$a This article presents measurements of tt¯tt¯ differential cross-sections in a fiducial phase-space region, using an integrated luminosity of 3.2 fb−1−1 of proton–proton data at a centre-of-mass energy of s√=13s=13 TeV recorded by the ATLAS experiment at the LHC in 2015. Differential cross-sections are measured as a function of the transverse momentum and absolute rapidity of the top quark, and of the transverse momentum, absolute rapidity and invariant mass of the tt¯tt¯ system. The tt¯tt¯ events are selected by requiring one electron and one muon of opposite electric charge, and at least two jets, one of which must be tagged as containing a b-hadron. The measured differential cross-sections are compared to predictions of next-to-leading order generators matched to parton showers and the measurements are found to be consistent with all models within the experimental uncertainties with the exception of the Powheg-Box++ Herwig++ predictions, which differ significantly from the data in both the transverse momentum of the top quark and the mass of the tt¯tt¯ system.
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This article presents measurements of tt¯tt¯ differential cross-sections in a fiducial phase-space region, using an integrated luminosity of 3.2 fb−1−1 of proton–proton data at a centre-of-mass energy of s√=13s=13 TeV recorded by the ATLAS experiment at the LHC in 2015. Differential cross-sections are measured as a function of the transverse momentum and absolute rapidity of the top quark, and of the transverse momentum, absolute rapidity and invariant mass of the tt¯tt¯ system. The tt¯tt¯ events are selected by requiring one electron and one muon of opposite electric charge, and at least two jets, one of which must be tagged as containing a b-hadron. The measured differential cross-sections are compared to predictions of next-to-leading order generators matched to parton showers and the measurements are found to be consistent with all models within the experimental uncertainties with the exception of the Powheg-Box++ Herwig++ predictions, which differ significantly from the data in both the transverse momentum of the top quark and the mass of the tt¯tt¯ system.