Search for dark matter produced in association with a Standard Model Higgs boson decaying into b-quarks using the full Run 2 dataset from the ATLAS detector
Authors
Alunno Camelia, E
Amelung, C
Amrouche, CS
Andrei, V
Publication Date
2021Journal Title
Journal of High Energy Physics
ISSN
1029-8479
Publisher
Springer Science and Business Media LLC
Volume
2021
Issue
11
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Aad, G., Abbott, B., Abbott, D., Abed Abud, A., Abeling, K., Abhayasinghe, D., Abidi, S., et al. (2021). Search for dark matter produced in association with a Standard Model Higgs boson decaying into b-quarks using the full Run 2 dataset from the ATLAS detector. Journal of High Energy Physics, 2021 (11) https://doi.org/10.1007/JHEP11(2021)209
Abstract
The production of dark matter in association with Higgs bosons is predicted
in several extensions of the Standard Model. An exploration of such scenarios
is presented, considering final states with missing transverse momentum and
$b$-tagged jets consistent with a Higgs boson. The analysis uses proton-proton
collision data at a centre-of-mass energy of 13 TeV recorded by the ATLAS
experiment at the LHC during Run 2, amounting to an integrated luminosity of
139 fb$^{-1}$. The analysis, when compared with previous searches, benefits
from a larger dataset, but also has further improvements providing sensitivity
to a wider spectrum of signal scenarios. These improvements include both an
optimised event selection and advances in the object identification, such as
the use of the likelihood-based significance of the missing transverse momentum
and variable-radius track-jets. No significant deviation from Standard Model
expectations is observed. Limits are set, at 95% confidence level, in two
benchmark models with two Higgs doublets extended by either a heavy vector
boson $Z'$ or a pseudoscalar singlet $a$ and which both provide a dark matter
candidate $\chi$. In the case of the two-Higgs-doublet model with an additional
vector boson $Z'$, the observed limits extend up to a $Z'$ mass of 3 TeV for a
mass of 100 GeV for the dark matter candidate. The two-Higgs-doublet model with
a dark matter particle mass of 10 GeV and an additional pseudoscalar $a$ is
excluded for masses of the $a$ up to 520 GeV and 240 GeV for $\tan \beta = 1$
and $\tan \beta = 10$ respectively. Limits on the visible cross-sections are
set and range from 0.05 fb to 3.26 fb, depending on the missing transverse
momentum and $b$-quark jet multiplicity requirements.
Keywords
Regular Article - Experimental Physics, Dark matter, Hadron-Hadron scattering (experiments)
Identifiers
jhep11(2021)209, 17250
External DOI: https://doi.org/10.1007/JHEP11(2021)209
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334420
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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