Observation of electroweak production of two jets in association with an isolated photon and missing transverse momentum, and search for a Higgs boson decaying into invisible particles at 13 TeV with the ATLAS detector
Authors
Camelia, EA
Amelung, C
Amrouche, CS
Publication Date
2022Journal Title
European Physical Journal C
ISSN
1434-6044
Publisher
Springer Science and Business Media LLC
Volume
82
Issue
2
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Aad, G., Abbott, B., Abbott, D., Abud, A., Abeling, K., Abhayasinghe, D., Abidi, S., et al. (2022). Observation of electroweak production of two jets in association with an isolated photon and missing transverse momentum, and search for a Higgs boson decaying into invisible particles at 13 TeV with the ATLAS detector. European Physical Journal C, 82 (2) https://doi.org/10.1140/epjc/s10052-021-09878-z
Abstract
This paper presents a measurement of the electroweak production of two jets
in association with a $Z\gamma$ pair, with the $Z$ boson decaying into two
neutrinos. It also presents a search for invisible or partially invisible
decays of a Higgs boson with a mass of 125 GeV produced through vector-boson
fusion with a photon in the final state. These results use data from LHC
proton-proton collisions at $\sqrt{s}$ = 13 TeV collected with the ATLAS
detector and corresponding to an integrated luminosity of 139 fb$^{-1}$. The
event signature, shared by all benchmark processes considered for the
measurements and searches, is characterized by a significant amount of
unbalanced transverse momentum and a photon in the final state, in addition to
a pair of forward jets. Electroweak $Z\gamma$ production in association with
two jets is observed in this final state with a significance of 5.2 (5.1
expected) standard deviations. The measured fiducial cross-section for this
process is 1.31$\pm$0.29 fb. An observed (expected) upper limit of 0.37
($0.34^{+0.15}_{-0.10}$) at 95% confidence level is set on the branching ratio
of a 125 GeV Higgs boson to invisible particles, assuming the Standard Model
production cross-section. The signature is also interpreted in the context of
decays of a Higgs boson into a photon and a dark photon. An observed (expected)
95% CL upper limit on the branching ratio for this decay is set at 0.018
($0.017^{+0.007}_{-0.005}$), assuming the Standard Model production
cross-section for a 125 GeV Higgs boson.
Keywords
Regular Article - Experimental Physics
Identifiers
s10052-021-09878-z, 9878
External DOI: https://doi.org/10.1140/epjc/s10052-021-09878-z
This record's URL: https://www.repository.cam.ac.uk/handle/1810/335578
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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