BibTex format
@article{Zwalinski:2025:epjc/s10052-025-14041-z,
author = {Zwalinski, L and Zou, W and Zormpa, O and Zorbas, TG and Zoch, K and Zoccoli, A and ivkovi, L and Ziolkowski, M and Zinsser, J and Zimine, NI and Zhukov, K and Zhuang, X and Zhu, Y and Zhu, Y and Zhu, X and Zhu, J and Zhu, CG and Zhou, Y and Zhou, Y and Zhou, Y and Zhou, N and Zhou, H and Zhou, B and Zhong, D and Zheng, Z and Zheng, X and Zheng, K and Zheng, J and Zhemchugov, A and Zhao, Z and Zhao, Z and Zhao, Y and Zhao, T and Zhao, H and Zhang, Z and Zhang, Z and Zhang, Z and Zhang, Y and Zhang, Y and Zhang, Y and Zhang, X and Zhang, X and Zhang, T and Zhang, S and Zhang, S and Zhang, R and Zhang, P and Zhang, L and Zhang, L and Zhang, K and Zhang, J and Zhang, J and Zhang, DF and Zhai, M and Zerwas, D and Zerradi, S and Zenz, S and eni, T and Zenin, O and Zenger, DT and Zeng, JC and Zeng, H and Zeitnitz, C and Zaplatilek, O and Zanzi, D and Zang, J and Zamora, Saa JA and Zambito, S and Zakharchuk, N and Zakareishvili, T and Zak, ZK and Zaid, E and Zabinski, B and Zaazoua, M and Yue},
doi = {epjc/s10052-025-14041-z},
journal = {European Physical Journal C},
title = {Search for tt¯H/A→tt¯tt¯ production in proton–proton collisions at s=13 TeV with the ATLAS detector},
url = {http://dx.doi.org/10.1140/epjc/s10052-025-14041-z},
volume = {85},
year = {2025}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - A search is presented for a heavy scalar (H) or pseudo-scalar (A) predicted by the two-Higgs-doublet models, where the H/A is produced in association with a top-quark pair (tt¯H/A), and with the H/A decaying into a tt¯ pair. The full LHC Run 2 proton–proton collision data collected by the ATLAS experiment is used, corresponding to an integrated luminosity of 139fb-1. Events are selected requiring exactly one or two opposite-charge electrons or muons. Data-driven corrections are applied to improve the modelling of the tt¯+jets background in the regime with high jet and b-jet multiplicities. These include a novel multi-dimensional kinematic reweighting based on a neural network trained using data and simulations. An H/A-mass parameterised graph neural network is trained to optimise the signal-to-background discrimination. In combination with the previous search performed by the ATLAS Collaboration in the multilepton final state, the observed upper limits on the tt¯H/A→tt¯tt¯ production cross-section at 95% confidence level range between 14 fb and 5.0 fb for an H/A with mass between 400 GeV and 1000 GeV, respectively. Assuming that both the H and A contribute to the tt¯tt¯ cross-section, tanβ values below 1.7 or 0.7 are excluded for a mass of 400 GeV or 1000 GeV, respectively. The results are also used to constrain a model predicting the pair production of a colour-octet scalar, with the scalar decaying into a tt¯ pair.
AU - Zwalinski,L
AU - Zou,W
AU - Zormpa,O
AU - Zorbas,TG
AU - Zoch,K
AU - Zoccoli,A
AU - ivkovi,L
AU - Ziolkowski,M
AU - Zinsser,J
AU - Zimine,NI
AU - Zhukov,K
AU - Zhuang,X
AU - Zhu,Y
AU - Zhu,Y
AU - Zhu,X
AU - Zhu,J
AU - Zhu,CG
AU - Zhou,Y
AU - Zhou,Y
AU - Zhou,Y
AU - Zhou,N
AU - Zhou,H
AU - Zhou,B
AU - Zhong,D
AU - Zheng,Z
AU - Zheng,X
AU - Zheng,K
AU - Zheng,J
AU - Zhemchugov,A
AU - Zhao,Z
AU - Zhao,Z
AU - Zhao,Y
AU - Zhao,T
AU - Zhao,H
AU - Zhang,Z
AU - Zhang,Z
AU - Zhang,Z
AU - Zhang,Y
AU - Zhang,Y
AU - Zhang,Y
AU - Zhang,X
AU - Zhang,X
AU - Zhang,T
AU - Zhang,S
AU - Zhang,S
AU - Zhang,R
AU - Zhang,P
AU - Zhang,L
AU - Zhang,L
AU - Zhang,K
AU - Zhang,J
AU - Zhang,J
AU - Zhang,DF
AU - Zhai,M
AU - Zerwas,D
AU - Zerradi,S
AU - Zenz,S
AU - eni,T
AU - Zenin,O
AU - Zenger,DT
AU - Zeng,JC
AU - Zeng,H
AU - Zeitnitz,C
AU - Zaplatilek,O
AU - Zanzi,D
AU - Zang,J
AU - Zamora,Saa JA
AU - Zambito,S
AU - Zakharchuk,N
AU - Zakareishvili,T
AU - Zak,ZK
AU - Zaid,E
AU - Zabinski,B
AU - Zaazoua,M
AU - Yue,L
AU - Yuan,R
AU - Yuan,M
AU - Yuan,J
AU - Yu,Y
AU - Yu,C
AU - Young,C
AU - Young,CJS
AU - Younas,S
AU - Yorita,K
AU - Yin,P
AU - Yildirim,TP
AU - Yexley,MR
AU - Yeo,B
AU - Yeletskikh,I
AU - Yeh,Y
AU - Ye,X
AU - Ye,S
AU - Ye,J
AU - Ye,H
AU - Ye,H
AU - Yao,WM
AU - Yang,Z
AU - Yang,Y
AU - Yang,Y
AU - Yang,X
DO - epjc/s10052-025-14041-z
PY - 2025///
SN - 1434-6044
TI - Search for tt¯H/A→tt¯tt¯ production in proton–proton collisions at s=13 TeV with the ATLAS detector
T2 - European Physical Journal C
UR - http://dx.doi.org/10.1140/epjc/s10052-025-14041-z
VL - 85
ER -