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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
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Journal Article
Search for tt¯H/A→tt¯tt¯ production in proton–proton collisions at s=13 TeV with the ATLAS detector
2025
Overview
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
¯
H
/
A
)
,
and with the
H
/
A
decaying into a
t
t
¯
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
¯
+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
¯
H
/
A
→
t
t
¯
t
t
¯
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
¯
t
t
¯
cross-section,
tan
β
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
¯
pair.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
