Measurement of $$ t\overline{t} $$ production in association with additional b-jets in the eμ final state in proton–proton collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector

electron Hadron-Hadron Scattering [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex] p p, scattering FOS: Physical sciences QC770-798 top, decay Top Physics ATLAS quark, pair High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) higher-order, 1 CERN LHC Coll parton, showers kinematics Nuclear and particle physics. Atomic energy. Radioactivity muon differential cross section [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] TeV top, pair production 5106 Nuclear and Plasma Physics 51 Physical Sciences 5107 Particle and High Energy Physics
DOI: 10.1007/jhep01(2025)068 Publication Date: 2025-01-15T15:08:28Z
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ABSTRACT
A bstract This paper presents measurements of top-antitop quark pair ( $$ t\overline{t} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> ) production in association with additional b -jets. The analysis utilises 140 fb − 1 proton–proton collision data collected the ATLAS detector at Large Hadron Collider a centre-of-mass energy 13 TeV. Fiducial cross-sections are extracted final state featuring one electron and muon, least three or four Results presented particle level for both integrated normalised differential cross-sections, as functions global event properties, jet kinematics, -jet properties. Observable quantities characterising -jets originating from top decay also measured level, after correcting effects. fiducial consistent t\overline{t}b\overline{b} <mml:mi>b</mml:mi> predictions various next-to-leading-order matrix element calculations matched to parton shower within uncertainties predictions. State-of-the-art theoretical compared measurements; none them simultaneously describes all observables. Differences between any two smaller than measurement most
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