Search for t(t)over-bar H/A->t(t)over-bart(t)over-bar production in proton-proton collisions at root s=13 TeV with the ATLAS detector
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00388987" target="_blank" >RIV/68407700:21220/25:00388987 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21240/25:00388987 RIV/68407700:21340/25:00388987 RIV/68407700:21670/25:00388987
Result on the web
<a href="https://doi.org/10.1140/epjc/s10052-025-14041-z" target="_blank" >https://doi.org/10.1140/epjc/s10052-025-14041-z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-025-14041-z" target="_blank" >10.1140/epjc/s10052-025-14041-z</a>
Alternative languages
Result language
angličtina
Original language name
Search for t(t)over-bar H/A->t(t)over-bart(t)over-bar production in proton-proton collisions at root s=13 TeV with the ATLAS detector
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
<a href="/en/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Fundamental constituents of matter through frontier technologies</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Physical Journal C
ISSN
1434-6044
e-ISSN
1434-6052
Volume of the periodical
85
Issue of the periodical within the volume
5
Country of publishing house
DE - GERMANY
Number of pages
36
Pages from-to
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UT code for WoS article
001595525400006
EID of the result in the Scopus database
2-s2.0-105009301920