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Search for light long-lived neutral particles from Higgs boson decays via vector-boson-fusion production from pp collisions at √s=13 TeV with the ATLAS detector

Aad, G. ; Åkesson, T.P.A. LU orcid ; Doglioni, C. LU ; Ekman, P.A. LU ; Hedberg, V. LU ; Herde, H. LU orcid ; Konya, B. LU ; Lytken, E. LU orcid ; Poettgen, R. LU orcid and Simpson, N.D. LU , et al. (2024) In European Physical Journal C 84(7).
Abstract
A search is reported for long-lived dark photons with masses between 0.1 GeV and 15 GeV, from exotic decays of Higgs bosons produced via vector-boson-fusion. Events that contain displaced collimated Standard Model fermions reconstructed in the calorimeter or muon spectrometer are probed. This search uses the full LHC Run 2 (2015–2018) data sample collected in proton–proton collisions at s=13 TeV, corresponding to an integrated luminosity of 139 fb-1. Dominant backgrounds from Standard Model processes and non-collision sources are estimated using data-driven techniques. The observed event yields in the signal regions are consistent with the expected background. Upper limits on the Higgs boson to dark photon branching fraction are reported... (More)
A search is reported for long-lived dark photons with masses between 0.1 GeV and 15 GeV, from exotic decays of Higgs bosons produced via vector-boson-fusion. Events that contain displaced collimated Standard Model fermions reconstructed in the calorimeter or muon spectrometer are probed. This search uses the full LHC Run 2 (2015–2018) data sample collected in proton–proton collisions at s=13 TeV, corresponding to an integrated luminosity of 139 fb-1. Dominant backgrounds from Standard Model processes and non-collision sources are estimated using data-driven techniques. The observed event yields in the signal regions are consistent with the expected background. Upper limits on the Higgs boson to dark photon branching fraction are reported as a function of the dark photon mean proper decay length or of the dark photon mass and the coupling between the Standard Model and the potential dark sector. This search is combined with previous ATLAS searches obtained in the gluon–gluon fusion and WH production modes. A branching fraction above 10% is excluded at 95% CL for a 125 GeV Higgs boson decaying into two dark photons for dark photon mean proper decay lengths between 173 and 1296 mm and mass of 10 GeV. © The Author(s) 2024. (Less)
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Contribution to journal
publication status
published
subject
keywords
Colliding beam accelerators, Dark Matter, Fermions, Photons, ATLAS detectors, Branching fractions, Decay length, Exotic decay, Higgs boson, Higgs Boson decay, Muon spectrometer, Neutral particles, Standard model, Vector boson, Bosons
in
European Physical Journal C
volume
84
issue
7
article number
719
publisher
Springer Nature
external identifiers
  • scopus:85207061431
ISSN
1434-6044
DOI
10.1140/epjc/s10052-024-12902-7
language
English
LU publication?
yes
id
b4fb5d4b-c39b-417a-9608-043c51f1da69
date added to LUP
2025-09-03 13:10:51
date last changed
2025-09-03 13:11:14
@article{b4fb5d4b-c39b-417a-9608-043c51f1da69,
  abstract     = {{A search is reported for long-lived dark photons with masses between 0.1 GeV and 15 GeV, from exotic decays of Higgs bosons produced via vector-boson-fusion. Events that contain displaced collimated Standard Model fermions reconstructed in the calorimeter or muon spectrometer are probed. This search uses the full LHC Run 2 (2015–2018) data sample collected in proton–proton collisions at s=13 TeV, corresponding to an integrated luminosity of 139 fb-1. Dominant backgrounds from Standard Model processes and non-collision sources are estimated using data-driven techniques. The observed event yields in the signal regions are consistent with the expected background. Upper limits on the Higgs boson to dark photon branching fraction are reported as a function of the dark photon mean proper decay length or of the dark photon mass and the coupling between the Standard Model and the potential dark sector. This search is combined with previous ATLAS searches obtained in the gluon–gluon fusion and WH production modes. A branching fraction above 10% is excluded at 95% CL for a 125 GeV Higgs boson decaying into two dark photons for dark photon mean proper decay lengths between 173 and 1296 mm and mass of 10 GeV. © The Author(s) 2024.}},
  author       = {{Aad, G. and Åkesson, T.P.A. and Doglioni, C. and Ekman, P.A. and Hedberg, V. and Herde, H. and Konya, B. and Lytken, E. and Poettgen, R. and Simpson, N.D. and Smirnova, O. and Zwalinski, L.}},
  issn         = {{1434-6044}},
  keywords     = {{Colliding beam accelerators; Dark Matter; Fermions; Photons; ATLAS detectors; Branching fractions; Decay length; Exotic decay; Higgs boson; Higgs Boson decay; Muon spectrometer; Neutral particles; Standard model; Vector boson; Bosons}},
  language     = {{eng}},
  number       = {{7}},
  publisher    = {{Springer Nature}},
  series       = {{European Physical Journal C}},
  title        = {{Search for light long-lived neutral particles from Higgs boson decays via vector-boson-fusion production from pp collisions at √s=13 TeV with the ATLAS detector}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-024-12902-7}},
  doi          = {{10.1140/epjc/s10052-024-12902-7}},
  volume       = {{84}},
  year         = {{2024}},
}