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Search for exotic decays of the Higgs boson into long-lived particles in pp collisions at √s = 13 TeV using displaced vertices in the ATLAS inner detector

Aad, G ; Åkesson, Torsten LU orcid ; Corrigan, Eric Edward LU ; Doglioni, Caterina LU ; Geisen, Jannik LU orcid ; Brottmann Hansen, Eva LU ; Hedberg, Vincent LU ; Jarlskog, Göran LU ; Konya, Balazs LU and Lytken, Else LU orcid , et al. (2021) In Journal of High Energy Physics 2021(11).
Abstract
A novel search for exotic decays of the Higgs boson into pairs of long-lived neutral particles, each decaying into a bottom quark pair, is performed using 139 fb−1 of s = 13 TeV proton-proton collision data collected with the ATLAS detector at the LHC. Events consistent with the production of a Higgs boson in association with a leptonically decaying Z boson are analysed. Long-lived particle (LLP) decays are reconstructed from inner-detector tracks as displaced vertices with high mass and track multiplicity relative to Standard Model processes. The analysis selection requires the presence of at least two displaced vertices, effectively suppressing Standard Model backgrounds. The residual background contribution is estimated using a... (More)
A novel search for exotic decays of the Higgs boson into pairs of long-lived neutral particles, each decaying into a bottom quark pair, is performed using 139 fb−1 of s = 13 TeV proton-proton collision data collected with the ATLAS detector at the LHC. Events consistent with the production of a Higgs boson in association with a leptonically decaying Z boson are analysed. Long-lived particle (LLP) decays are reconstructed from inner-detector tracks as displaced vertices with high mass and track multiplicity relative to Standard Model processes. The analysis selection requires the presence of at least two displaced vertices, effectively suppressing Standard Model backgrounds. The residual background contribution is estimated using a data-driven technique. No excess over Standard Model predictions is observed, and upper limits are set on the branching ratio of the Higgs boson to LLPs. Branching ratios above 10% are excluded at 95% confidence level for LLP mean proper lifetimes cτ as small as 4 mm and as large as 100 mm. For LLP masses below 40 GeV, these results represent the most stringent constraint in this lifetime regime. [Figure not available: see fulltext.] © 2021, The Author(s). (Less)
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type
Contribution to journal
publication status
published
subject
keywords
Exotics, Hadron-Hadron scattering (experiments), Higgs physics, Lifetime, proton-proton scattering
in
Journal of High Energy Physics
volume
2021
issue
11
article number
229
publisher
Springer
external identifiers
  • scopus:85121293715
ISSN
1029-8479
DOI
10.1007/JHEP11(2021)229
language
English
LU publication?
yes
id
a8f01420-10b6-41b8-95b8-eb99a8ea8edc
date added to LUP
2022-02-01 10:29:24
date last changed
2023-04-02 21:28:21
@article{a8f01420-10b6-41b8-95b8-eb99a8ea8edc,
  abstract     = {{A novel search for exotic decays of the Higgs boson into pairs of long-lived neutral particles, each decaying into a bottom quark pair, is performed using 139 fb−1 of s = 13 TeV proton-proton collision data collected with the ATLAS detector at the LHC. Events consistent with the production of a Higgs boson in association with a leptonically decaying Z boson are analysed. Long-lived particle (LLP) decays are reconstructed from inner-detector tracks as displaced vertices with high mass and track multiplicity relative to Standard Model processes. The analysis selection requires the presence of at least two displaced vertices, effectively suppressing Standard Model backgrounds. The residual background contribution is estimated using a data-driven technique. No excess over Standard Model predictions is observed, and upper limits are set on the branching ratio of the Higgs boson to LLPs. Branching ratios above 10% are excluded at 95% confidence level for LLP mean proper lifetimes cτ as small as 4 mm and as large as 100 mm. For LLP masses below 40 GeV, these results represent the most stringent constraint in this lifetime regime. [Figure not available: see fulltext.] © 2021, The Author(s).}},
  author       = {{Aad, G and Åkesson, Torsten and Corrigan, Eric Edward and Doglioni, Caterina and Geisen, Jannik and Brottmann Hansen, Eva and Hedberg, Vincent and Jarlskog, Göran and Konya, Balazs and Lytken, Else and Mankinen, Katja and Marcon, Caterina and Mjörnmark, Ulf and Mullier, Geoffrey André Adrien and Pöttgen, Ruth and Skorda, Eleni and Smirnova, Oxana and Zwalinski, L}},
  issn         = {{1029-8479}},
  keywords     = {{Exotics; Hadron-Hadron scattering (experiments); Higgs physics; Lifetime; proton-proton scattering}},
  language     = {{eng}},
  number       = {{11}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{Search for exotic decays of the Higgs boson into long-lived particles in pp collisions at √s = 13 TeV using displaced vertices in the ATLAS inner detector}},
  url          = {{http://dx.doi.org/10.1007/JHEP11(2021)229}},
  doi          = {{10.1007/JHEP11(2021)229}},
  volume       = {{2021}},
  year         = {{2021}},
}