Search for tt¯H/A→tt¯tt¯ production in proton–proton collisions at s=13 TeV with the ATLAS detector

L. Zwalinski; W. Zou; O. Zormpa; T. G. Zorbas; K. Zoch; A. Zoccoli; L. Živković; M. Ziolkowski; J. Zinsser; N. I. Zimine; K. Zhukov; X. Zhuang; Y. Zhu; X. Zhu; J. Zhu; C. G. Zhu; Y. Zhou; N. Zhou; H. Zhou; B. Zhou; D. Zhong; Z. Zheng; X. Zheng; K. Zheng; J. Zheng; A. Zhemchugov; Z. Zhao; Y. Zhao; T. Zhao; H. Zhao; Z. Zhang; Y. Zhang; X. Zhang; T. Zhang; S. Zhang; R. Zhang; P. Zhang; L. Zhang; K. Zhang; J. Zhang; D. F. Zhang; M. Zhai; D. Zerwas; S. Zerradi; S. Zenz; T. Ženiš; O. Zenin; D. T. Zenger; J. C. Zeng; H. Zeng; C. Zeitnitz; O. Zaplatilek; D. Zanzi; J. Zang; J. A. Zamora Saa; S. Zambito; N. Zakharchuk; T. Zakareishvili; Z. K. Zak; E. Zaid; B. Zabinski; M. Zaazoua; L. Yue; R. Yuan; M. Yuan; J. Yuan; Y. Yu; C. Yu; C. Young; C. J.S. Young; S. Younas; K. Yorita; P. Yin; T. P. Yildirim; M. R. Yexley; B. Yeo; I. Yeletskikh; Y. Yeh; X. Ye; S. Ye; J. Ye; H. Ye; W. M. Yao; Z. Yang; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Y. Yang; Yuan-Tang Chou; X. Yang

doi:10.1140/epjc/s10052-025-14041-z

Search for tt¯H/A→tt¯tt¯ production in proton–proton collisions at s=13 TeV with the ATLAS detector

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Search for tt¯H/A→tt¯tt¯ production in proton–proton collisions at s=13 TeV with the ATLAS detector

L. Zwalinski, W. Zou, O. Zormpa, T. G. Zorbas, K. Zoch, A. Zoccoli, L. Živković, M. Ziolkowski, J. Zinsser, N. I. Zimine, …

The European physical journal. C, Particles and fields, 卷.85(5), 頁.573

01/05/2025

DOI: https://doi.org/10.1140/epjc/s10052-025-14041-z

Web of Science ID: WOS:001595525400006

摘要

<p>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 (t (t) over barH/A), and with the H/A decaying into a t (t) over bar pair. The full LHC Run 2 proton-proton collision data collected by the ATLAS experiment is used, corresponding to an integrated luminosity of 139 fb(-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 t (t) over bar +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 t (t) over barH/A -> t (t) over bart (t) over bar 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 t (t) over bart (t) over bar cross-section, tan beta 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 t (t) over bar pair.</p>

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題名: Search for tt¯H/A→tt¯tt¯ production in proton–proton collisions at s=13 TeV with the ATLAS detector
創作者：: L. Zwalinski - European Organization for Nuclear Research
W. Zou - Columbia University
O. Zormpa - National Centre of Scientific Research "Demokritos"
T. G. Zorbas - University of Sheffield
K. Zoch - Harvard University Press
A. Zoccoli - Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
L. Živković - University of Belgrade
M. Ziolkowski - University of Siegen
J. Zinsser - Heidelberg University
N. I. Zimine - European Organization for Nuclear Research
K. Zhukov - European Organization for Nuclear Research
X. Zhuang - Chinese Academy of Sciences
Y. Zhu - University of Science and Technology of China
Y. Zhu - University of Science and Technology of China
X. Zhu - Tsung-Dao Lee Institute, Shanghai, China
J. Zhu - University of Michigan
C. G. Zhu - Shandong University
Y. Zhou - University of Arizona
Y. Zhou - University of Arizona
N. Zhou - Shanghai Jiao Tong University
H. Zhou - University of Arizona
B. Zhou - University of Michigan
D. Zhong - University of Illinois System
Z. Zheng - SLAC National Accelerator Laboratory
X. Zheng - University of Science and Technology of China
K. Zheng - University of Illinois System
J. Zheng - Nanjing University
A. Zhemchugov - European Organization for Nuclear Research
Z. Zhao - University of Science and Technology of China
Z. Zhao - University of Science and Technology of China
Y. Zhao - University of California, Santa Cruz
T. Zhao - Shandong University
H. Zhao - University of Washington
Z. Zhang - Centre National de la Recherche Scientifique
Z. Zhang - Centre National de la Recherche Scientifique
Y. Zhang - Shanghai Jiao Tong University
Y. Zhang - Shanghai Jiao Tong University
Y. Zhang - Shanghai Jiao Tong University
X. Zhang - Shandong University
X. Zhang - Shandong University
T. Zhang - The University of Tokyo
S. Zhang - Centre National de la Recherche Scientifique
S. Zhang - Centre National de la Recherche Scientifique
R. Zhang - University of Wisconsin–Madison
P. Zhang - Chinese Academy of Sciences
L. Zhang - University of Science and Technology of China
L. Zhang - University of Science and Technology of China
K. Zhang - Chinese Academy of Sciences
J. Zhang - Argonne National Laboratory
J. Zhang - Argonne National Laboratory
D. F. Zhang - University of Sheffield
M. Zhai - Chinese Academy of Sciences
D. Zerwas - Centre National de la Recherche Scientifique
S. Zerradi - University of Hassan II Casablanca
S. Zenz - Queen Mary University of London
T. Ženiš - Comenius University Bratislava
O. Zenin - European Organization for Nuclear Research
D. T. Zenger - Brandeis University
J. C. Zeng - University of Illinois System
H. Zeng - Chinese Academy of Sciences
C. Zeitnitz - University of Wuppertal
O. Zaplatilek - Czech Technical University in Prague
D. Zanzi - University of Freiburg
J. Zang - The University of Tokyo
J. A. Zamora Saa - Universidad Andrés Bello
S. Zambito - University of Geneva
N. Zakharchuk - Carleton University
T. Zakareishvili - Universitat de València
Z. K. Zak - Institute of Nuclear Physics, Polish Academy of Sciences
E. Zaid - University of Edinburgh
B. Zabinski - Institute of Nuclear Physics, Polish Academy of Sciences
M. Zaazoua - University of Science and Technology of China
L. Yue - University College London
R. Yuan - Shanghai Jiao Tong University
M. Yuan - University of Michigan
J. Yuan - Chinese Academy of Sciences
Y. Yu - University of Science and Technology of China
C. Yu - Chinese Academy of Sciences
C. Young - SLAC National Accelerator Laboratory
C. J.S. Young - SLAC National Accelerator Laboratory
S. Younas - Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering
K. Yorita - Waseda University
P. Yin - Columbia University
T. P. Yildirim - University of Oxford
M. R. Yexley - University College London
B. Yeo - University of California System
I. Yeletskikh - European Organization for Nuclear Research
Y. Yeh - University College London
X. Ye - University of Science and Technology of China
S. Ye - Brookhaven National Laboratory
J. Ye - Chinese Academy of Sciences
H. Ye - University of Göttingen
H. Ye - University of Göttingen
W. M. Yao - Lawrence Berkeley National Laboratory
Z. Yang - University of Science and Technology of China
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Y. Yang - University of Science and Technology of China
Yuan-Tang Chou
X. Yang - Chinese Academy of Sciences
出版者: SPRINGER; NEW YORK
總頁數: 36
補助款備註: Ministry of Education, Culture, Sports, Science and Technology (http://data.elsevier.com/vocabulary/SciValFunders/501100001700) UK Research and Innovation (http://data.elsevier.com/vocabulary/SciValFunders/100014013) Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science (http://data.elsevier.com/vocabulary/SciValFunders/501100003941) Marcus och Amalia Wallenbergs minnesfond (http://data.elsevier.com/vocabulary/SciValFunders/501100011898) ECA DE-AC02-76SF00515 / U.S. Department of Energy (http://data.elsevier.com/vocabulary/SciValFunders/100000015) Canarie (http://data.elsevier.com/vocabulary/SciValFunders/100008313) Irish Rugby Football Union (http://data.elsevier.com/vocabulary/SciValFunders/501100024313) RGC IDIFEDER /2018/048 / European Regional Development Fund (http://data.elsevier.com/vocabulary/SciValFunders/501100008530) Natural Sciences and Engineering Research Council of Canada (http://data.elsevier.com/vocabulary/SciValFunders/501100000038)
學術資源類型: 期刊文章
出版日期: 01/05/2025
出版資訊: The European physical journal. C, Particles and fields, 卷.85(5), 頁.573
語言: 英語

Search for tt¯H/A→tt¯tt¯ production in proton–proton collisions at s=13 TeV with the ATLAS detector

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