TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.18.004
TI  - Measurements of $t\bar{t}$ in association with charm quarks at 13 TeV with the ATLAS experiment
PY  - 2026/01/29
UR  - https://scipost.org/SciPostPhysProc.18.004
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 18
SP  - 004
A1  - Zoch, Knut
AB  - This talk presents the ATLAS Collaboration's first measurement of the inclusive cross-section for top-quark pair production in association with charm quarks. Using the full Run~2 proton--proton collision data sample at $\sqrt{s} = 13\,\text{TeV}$, collected with the ATLAS experiment at the LHC between 2015 and 2018, the measurement selects $t\bar{t}$ events with one or two charged leptons and at least one additional jet in the final state. A custom flavour-tagging algorithm is employed to simultaneously identify $b$-jets and $c$-jets. The fiducial cross-sections for $t\bar{t}+{≥}2c$ and $t\bar{t}+1c$ production are found to largely agree with predictions from various $t\bar{t}$ simulations, though all underpredict the observed values.
ER  -

@Article{10.21468/SciPostPhysProc.18.004,
	title={{Measurements of $t\bar{t}$ in association with charm quarks at 13 TeV with the ATLAS experiment}},
	author={Knut Zoch},
	journal={SciPost Phys. Proc.},
	pages={004},
	year={2026},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.18.004},
	url={https://scipost.org/10.21468/SciPostPhysProc.18.004},
}