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Constraints on spin-0 dark matter mediators and invisible Higgs decays using ATLAS 13 TeV pp collision data with two top quarks and missing transverse momentum in the final state ATLAS Collaboration
Abstract
This paper presents a statistical combination of searches targeting final states with two top quarks and invisible particles, characterised by the presence of zero, one or two leptons, at least one jet originating from a b-quark and missing transverse momentum. The analyses are searches for phenomena beyond the Standard Model consistent with the direct production of dark matter in pp collisions at the LHC, using 139 fb−1 of data collected with the ATLAS detector at a centre-of-mass energy of 13 TeV. The results are interpreted in terms of simplified dark matter models with a spin-0 scalar or pseudoscalar mediator particle. In addition, the results are interpreted in terms of upper limits on the Higgs boson invisible branching ratio, where the Higgs boson is produced according to the Standard Model in association with a pair of top quarks. For scalar (pseudoscalar) dark matter models, with all couplings set to unity, the statistical combination extends the mass range excluded by the best of the individual channels by 50 (25) GeV, excluding mediator masses up to 370 GeV. In addition, the statistical combination improves the expected coupling exclusion reach by 14% (24%), assuming a scalar (pseudoscalar) mediator mass of 10 GeV. An upper limit on the Higgs boson invisible branching ratio of 0.38 (0.30+0.13 −0.09) is observed (expected) at 95% confidence level.
Item Metadata
Title |
Constraints on spin-0 dark matter mediators and invisible Higgs decays using ATLAS 13 TeV pp collision data with two top quarks and missing transverse momentum in the final state
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Creator | |
Publisher |
Springer Berlin Heidelberg
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Date Issued |
2023-06-13
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Description |
This paper presents a statistical combination of
searches targeting final states with two top quarks and invisible particles, characterised by the presence of zero, one or
two leptons, at least one jet originating from a b-quark and
missing transverse momentum. The analyses are searches for
phenomena beyond the Standard Model consistent with the
direct production of dark matter in pp collisions at the LHC,
using 139 fb−1 of data collected with the ATLAS detector at a centre-of-mass energy of 13 TeV. The results are
interpreted in terms of simplified dark matter models with
a spin-0 scalar or pseudoscalar mediator particle. In addition, the results are interpreted in terms of upper limits on
the Higgs boson invisible branching ratio, where the Higgs
boson is produced according to the Standard Model in association with a pair of top quarks. For scalar (pseudoscalar) dark
matter models, with all couplings set to unity, the statistical
combination extends the mass range excluded by the best of
the individual channels by 50 (25) GeV, excluding mediator
masses up to 370 GeV. In addition, the statistical combination improves the expected coupling exclusion reach by 14%
(24%), assuming a scalar (pseudoscalar) mediator mass of
10 GeV. An upper limit on the Higgs boson invisible branching ratio of 0.38 (0.30+0.13
−0.09) is observed (expected) at 95%
confidence level.
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Genre | |
Type | |
Language |
eng
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Date Available |
2023-09-12
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution 4.0 International (CC BY 4.0)
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DOI |
10.14288/1.0435855
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URI | |
Affiliation | |
Citation |
The European Physical Journal C. 2023 Jun 13;83(6):503
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Publisher DOI |
10.1140/epjc/s10052-023-11477-z
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Peer Review Status |
Reviewed
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Scholarly Level |
Faculty; Researcher
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Copyright Holder |
The Author(s)
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution 4.0 International (CC BY 4.0)