Search for the decay of the Higgs boson to a Z boson and a light pseudoscalar particle decaying to two photons

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Abstract: A search for the decay of the Higgs boson to a boson and a light, pseudoscalar particle, , decaying respectively to two leptons and to two photons is reported. The search uses the full LHC Run 2 proton–proton collision data at √ = 13 TeV, corresponding to 139 fb−1 collected by the ATLAS detector. This is one of the first searches for this specific decay mode of the Higgs boson, and it probes unexplored parameter space in models with axion-like particles (ALPs) and extended scalar sectors. The mass of the particle is assumed to be in the range 0.1–33 GeV. The data are analysed in two categories: a merged category where the photons from the decay are reconstructed in the ATLAS calorimeter as a single cluster, and a resolved category in which two separate photons are detected. The main background processes are from Standard Model boson production in association with photons or jets. The data are in agreement with the background predictions, and upper limits on the branching ratio of the Higgs boson decay to times the branching ratio → are derived at the 95% confidence level and they range from 0.08% to 2% depending on the mass of the particle. The results are also interpreted in the context of ALP models

Location
Deutsche Nationalbibliothek Frankfurt am Main
Extent
Online-Ressource
Language
Englisch
Notes
Physics letters. - 850 (2024) , 138536, ISSN: 1873-2445

Event
Veröffentlichung
(where)
Freiburg
(who)
Universität
(when)
2024
Creator
Contributor
Experimentelle Teilchenphysik

DOI
10.1016/j.physletb.2024.138536
URN
urn:nbn:de:bsz:25-freidok-2533795
Rights
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Last update
15.08.2025, 7:26 AM CEST

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Associated

Time of origin

  • 2024

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