Search for top-philic heavy resonances in pp collisions at $$\sqrt{s}=13$$ s = 13 $$\text {TeV}$$ TeV with the ATLAS detector
No Thumbnail Available
Authors
Issue Date
2024-02-15
Type
Journal Article
Language
Keywords
Alternative Title
Abstract
Abstract
A search for the associated production of a heavy resonance with a top-quark or a top-antitop-quark pair, and decaying into a
$$t{\bar{t}}$$
t
t
¯
pair is presented. The search uses the data recorded by the ATLAS detector in pp collisions at
$$\sqrt{s}= 13$$
s
=
13
$$\text {TeV}$$
TeV
at the Large Hadron Collider during the years 2015–2018, corresponding to an integrated luminosity of 139
$$\text {fb}^{-1}$$
fb
-
1
. Events containing exactly one electron or muon are selected. The two hadronically decaying top quarks from the resonance decay are reconstructed using jets clustered with a large radius parameter of
$$R=1$$
R
=
1
. The invariant mass spectrum of the two top quark candidates is used to search for a resonance signal in the range of 1.0
$$\text {TeV}$$
TeV
to 3.2
$$\text {TeV}$$
TeV
. The presence of a signal is examined using an approach with minimal model dependence followed by a model-dependent interpretation. No significant excess is observed over the background expectation. Upper limits on the production cross section times branching ratio at 95% confidence level are provided for a heavy
$$Z^\prime $$
Z
′
boson based on a simplified model, for
$$Z^\prime $$
Z
′
mass between 1.0
$$\text {TeV}$$
TeV
and 3.0
$$\text {TeV}$$
TeV
. The observed (expected) limits range from 21 (14) fb to 119 (86) fb depending on the choice of model parameters.
Description
Citation
The European Physical Journal C. 2024 Feb 15;84(2):157