Open this publication in new window or tab >>Show others...
2025 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 860, article id 139177Article in journal (Refereed) Published
Abstract [en]
Inclusive 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 tt¯+≥2c and tt¯+1c production are measured to be 1.28−0.24+0.27pb and 6.4−0.9+1.0pb, respectively. The measurements are primarily limited by uncertainties in the modeling of inclusive tt¯ and tt¯+bb¯ production, in the calibration of the flavor-tagging algorithm, and by data statistics. Cross-section predictions from various tt¯ 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 tt¯ decay products and the jet multiplicity, the cross-section ratios of tt¯+≥2c and tt¯+1c to total tt¯+jets production are determined to be (1.23±0.25)% and (8.8±1.3)%.
Place, publisher, year, edition, pages
Elsevier BV, 2025
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-357939 (URN)10.1016/j.physletb.2024.139177 (DOI)2-s2.0-85211336127 (Scopus ID)
Note
QC 20241219
2024-12-192024-12-192024-12-19Bibliographically approved