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
Authors
Alunno Camelia, E
Amelung, C
Amrouche, CS
Andrei, V
Publication Date
2021Journal Title
Journal of High Energy Physics
ISSN
1029-8479
Publisher
Springer Science and Business Media LLC
Volume
2021
Issue
11
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Aad, G., Abbott, B., Abbott, D., Abed Abud, A., Abeling, K., Abhayasinghe, D., Abidi, S., et al. (2021). 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. Journal of High Energy Physics, 2021 (11) https://doi.org/10.1007/JHEP11(2021)229
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 $\sqrt{s} = 13$ 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 $c\tau$ 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.
Keywords
Regular Article - Experimental Physics, Exotics, Hadron-Hadron scattering (experiments), Higgs physics, proton-proton scattering, Lifetime
Identifiers
jhep11(2021)229, 17269
External DOI: https://doi.org/10.1007/JHEP11(2021)229
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334427
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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