Search for Higgs bosons decaying into new spin-0 or spin-1 particles in four-lepton final states with the ATLAS detector with 139 fb<SUP>-1</SUP> of <i>pp</i> collision data at √<i>s</i>=13 TeV



Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H
et al (show 2891 more authors) (2022) Search for Higgs bosons decaying into new spin-0 or spin-1 particles in four-lepton final states with the ATLAS detector with 139 fb<SUP>-1</SUP> of <i>pp</i> collision data at √<i>s</i>=13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 03 (3). 041-.

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Abstract

Searches are conducted for new spin-0 or spin-1 bosons using events where a Higgs boson with mass $125$ GeV decays into four leptons ($\ell =$ $e$,$\mu$). This decay is presumed to occur via an intermediate state which contains two on-shell, promptly decaying bosons: $H \rightarrow XX/ZX \rightarrow 4\ell$, where the new boson $X$ has a mass between 1 and 60 GeV. The search uses $pp$ collision data collected with the ATLAS detector at the LHC with an integrated luminosity of 139 fb$^{-1}$ at a centre-of-mass energy $\sqrt{s}=13$ TeV. The data are found to be consistent with Standard Model expectations. Limits are set on fiducial cross sections and on the branching ratio of the Higgs boson to decay into $XX/ZX$, improving those from previous publications by a factor between two and four. Limits are also set on mixing parameters relevant in extensions of the Standard Model containing a dark sector where $X$ is interpreted to be a dark boson.

Item Type: Article
Additional Information: 65 pages in total, author list starting page 49, 20 figures, 6 tables, submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-55
Uncontrolled Keywords: Beyond Standard Model, Hadron-Hadron Scattering, Higgs Physics
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 19 Apr 2022 15:00
Last Modified: 07 Oct 2023 15:24
DOI: 10.1007/JHEP03(2022)041
Open Access URL: https://link.springer.com/article/10.1007/JHEP03(2...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3153369