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Search for dark photons from Higgs boson decays via ZH production with a photon plus missing transverse momentum signature from pp collisions at √s = 13 TeV with the ATLAS detector ATLAS Collaboration
Abstract
This paper describes a search for dark photons (γd) in proton-proton collisions at √ s = 13 TeV at the Large Hadron Collider (LHC). The dark photons are searched for in the decay of Higgs bosons (H → γγd) produced through the ZH production mode. The transverse mass of the system, made of the photon and the missing transverse momentum from the non-interacting γd, presents a distinctive signature as it peaks near the Higgs boson mass. The results presented use the total Run-2 integrated luminosity of 139 fb−1 recorded by the ATLAS detector at the LHC. The dominant reducible background processes are estimated using data-driven techniques. A Boosted Decision Tree technique is adopted to enhance the sensitivity of the search. As no excess is observed with respect to the Standard Model prediction, an observed (expected) upper limit on the branching ratio BR(H → γγd) of 2.28% (2.82+1.33 −0.84%) is set at 95% CL for massless γd. For massive dark photons up to 40 GeV, the observed (expected) upper limits on BR(H → γγd) at 95% confidence level is found within the [2.19,2.52]% ([2.71,3.11]%) range.
Item Metadata
Title |
Search for dark photons from Higgs boson decays via ZH production with a photon plus missing transverse momentum signature from pp collisions at √s = 13 TeV with the ATLAS detector
|
Creator | |
Publisher |
Springer Berlin Heidelberg
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Date Issued |
2023-07-17
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Description |
This paper describes a search for dark photons (γd) in proton-proton collisions
at √
s = 13 TeV at the Large Hadron Collider (LHC). The dark photons are searched for
in the decay of Higgs bosons (H → γγd) produced through the ZH production mode. The
transverse mass of the system, made of the photon and the missing transverse momentum
from the non-interacting γd, presents a distinctive signature as it peaks near the Higgs boson
mass. The results presented use the total Run-2 integrated luminosity of 139 fb−1
recorded
by the ATLAS detector at the LHC. The dominant reducible background processes are
estimated using data-driven techniques. A Boosted Decision Tree technique is adopted to
enhance the sensitivity of the search. As no excess is observed with respect to the Standard
Model prediction, an observed (expected) upper limit on the branching ratio BR(H → γγd)
of 2.28% (2.82+1.33
−0.84%) is set at 95% CL for massless γd. For massive dark photons up to
40 GeV, the observed (expected) upper limits on BR(H → γγd) at 95% confidence level is
found within the [2.19,2.52]% ([2.71,3.11]%) range.
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Subject | |
Genre | |
Type | |
Language |
eng
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Date Available |
2023-08-08
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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 |
10.14288/1.0435091
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URI | |
Affiliation | |
Citation |
Journal of High Energy Physics. 2023 Jul 17;2023(7):133
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Publisher DOI |
10.1007/JHEP07(2023)133
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Peer Review Status |
Reviewed
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Scholarly Level |
Faculty; Researcher; Postdoctoral
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Copyright Holder |
The Author(s)
|
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)