Search for Higgs Boson Decays into a <i>Z</i> Boson and a Light Hadronically Decaying Resonance Using 13 TeV <i>pp</i> Collision Data from the ATLAS Detector



Aad, G, Abbott, B, Abbott, DC, Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2945 more authors) (2020) Search for Higgs Boson Decays into a <i>Z</i> Boson and a Light Hadronically Decaying Resonance Using 13 TeV <i>pp</i> Collision Data from the ATLAS Detector. PHYSICAL REVIEW LETTERS, 125 (22). 221802-.

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Abstract

A search for Higgs boson decays into a Z boson and a light resonance in two-lepton plus jet events is performed, using a pp collision dataset with an integrated luminosity of 139  fb^{-1} collected at sqrt[s]=13  TeV by the ATLAS experiment at the CERN LHC. The resonance considered is a light boson with a mass below 4 GeV from a possible extended scalar sector or a charmonium state. Multivariate discriminants are used for the event selection and for evaluating the mass of the light resonance. No excess of events above the expected background is found. Observed (expected) 95% confidence-level upper limits are set on the Higgs boson production cross section times branching fraction to a Z boson and the signal resonance, with values in the range 17-340 pb (16_{-5}^{+6}-320_{-90}^{+130}  pb) for the different light spin-0 boson mass and branching fraction hypotheses, and with values of 110 and 100 pb (100_{-30}^{+40} and 100_{-30}^{+40}  pb) for the η_{c} and J/ψ hypotheses, respectively.

Item Type: Article
Additional Information: 32 pages in total, author list starting page 16, 2 figures, 1 table, published in Phys. Rev. Lett. All figures including auxiliary figures will be available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-37
Uncontrolled Keywords: ATLAS Collaboration
Depositing User: Symplectic Admin
Date Deposited: 14 Dec 2020 10:18
Last Modified: 11 Oct 2023 21:57
DOI: 10.1103/PhysRevLett.125.221802
Open Access URL: https://journals.aps.org/prl/abstract/10.1103/Phys...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3110215