Measurement of top-quark pair production in association with charm quarks in proton–proton collisions at √𝑠 = 13 TeV with the ATLAS detector

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dc.contributor.authorAad, G.
dc.contributor.authorAakvaag, E.
dc.contributor.authorAbbott, B.
dc.contributor.authorAbdelhameed, S.
dc.contributor.authorAbeling, K.
dc.contributor.authorAbicht, N.J.
dc.contributor.authorAbidi, S.H.
dc.contributor.authorAboelela, M.
dc.contributor.authorAboulhorma, A.
dc.contributor.authorAbramowicz, H.
dc.contributor.authorAbreu, H.
dc.contributor.authorAbulaiti, Y.
dc.contributor.authorAcharya, B.S.
dc.contributor.authorAckermann, A.
dc.contributor.authorAdam Bourdarios, C.
dc.contributor.authorAdamczyk, L.
dc.contributor.authorAddepalli, S.V.
dc.contributor.authorAddison, M.J.
dc.contributor.authorAdelman, J.
dc.contributor.authorAdiguzel, A.
dc.contributor.authoret al.
dc.date.issued2025
dc.description.abstractInclusive cross-sections for top-quark pair production in association with charm quarks are measured with proton-proton collision data at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 140 fb−1, collected with the ATLAS experiment at the LHC between 2015 and 2018. The measurements are performed by requiring one or two charged leptons (electrons and muons), two 𝑏-tagged jets, and at least one additional jet in the final state. A custom flavor-tagging algorithm is employed for the simultaneous identification of 𝑏-jets and 𝑐-jets. In a fiducial phase space that replicates the acceptance of the ATLAS detector, the cross-sections for 𝑡𝑡̄+ ≥2𝑐 and 𝑡𝑡̄+ 1𝑐 production are measured to be 1.28+0.27 −0.24 pb and 6.4+1.0 −0.9 pb, respectively. The measurements are primarily limited by uncertainties in the modeling of inclusive 𝑡𝑡̄ and 𝑡𝑡̄+ 𝑏𝑏̄ production, in the calibration of the flavor-tagging algorithm, and by data statistics. Cross-section predictions from various 𝑡𝑡̄ simulations are largely consistent with the measured cross-section values, though all underpredict the observed values by 0.5 to 2.0 standard deviations. In a phase-space volume without requirements on the 𝑡𝑡̄ decay products and the jet multiplicity, the cross-section ratios of 𝑡𝑡̄ + ≥2𝑐 and 𝑡𝑡̄ + 1𝑐 to total 𝑡𝑡̄ + jets production are determined to be (1.23 ± 0.25)% and (8.8±1.3)%.
dc.description.statementofresponsibilityThe ATLAS Collaboration
dc.identifier.citationPhysics Letters B, 2025; 860:139177-1-139177-28
dc.identifier.doi10.1016/j.physletb.2024.139177
dc.identifier.issn0370-2693
dc.identifier.issn0370-2693
dc.identifier.urihttps://hdl.handle.net/2440/147057
dc.language.isoen
dc.publisherElsevier
dc.relation.grantARC
dc.rights© 2024 CERN for the beneϧt of the ATLAS Collaboration. Published by Elsevier B.V. Funded by SCOAP³. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
dc.source.urihttps://doi.org/10.1016/j.physletb.2024.139177
dc.subjecttop-quark pair production
dc.titleMeasurement of top-quark pair production in association with charm quarks in proton–proton collisions at √𝑠 = 13 TeV with the ATLAS detector
dc.title.alternativeMeasurement of top-quark pair production in association with charm quarks in proton-proton collisions at root s = 13 TeV with the ATLAS detector
dc.typeJournal article
pubs.publication-statusPublished

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