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Preprint
Report number arXiv:2411.16361 ; CERN-EP-2024-261
Title Search for Higgs boson decays into a Z boson and a light hadronically decaying resonance in 140 fb1 of 13 TeV pp collisions with the ATLAS detector
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Author(s) ATLAS Collaboration  Mostrar todos los 2922 autores
Corporate author(s) ATLAS Collaboration
Publication 2024
Imprint 25 Nov 2024
Number of pages 37
Note 37 pages in total, author list starting page 20, 10 (sub)figures, 0 tables, submitted to Phys. Lett. B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2021-09/
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Keywords Higgs physics ; particle and resonance production ; experimental results ; Z boson ; hadronic resonance ; axion-like particle
Abstract A search for decays of the Higgs boson into a Z boson and a light resonance, with a mass of 0.5-3.5 GeV, is performed using the full 140 fb1 dataset of 13 TeV proton-proton collisions recorded by the ATLAS detector during Run 2 of the LHC. Leptonic decays of the Z boson and hadronic decays of the light resonance are considered. The resonance can be interpreted as a J/ψ or ηc meson, an axion-like particle, or a light pseudoscalar in two-Higgs-doublet models. Due to its low mass, it would be produced with high boost and reconstructed as a single small-radius jet of hadrons. A neural network is used to correct the Monte Carlo simulation of the background in a data-driven way. Two additional neural networks are used to distinguish signal from background. A binned profile-likelihood fit is performed on the final-state invariant mass distribution. No significant excess of events relative to the expected background is observed, and upper limits at 95% confidence level are set on the Higgs boson's branching fraction to a Z boson and a light resonance. The exclusion limit is  10% for the lower masses, and increases for higher masses. Upper limits on the effective coupling CZHeff/Λ of an axion-like particle to a Higgs boson and Z boson are also set at 95% confidence level, and range from 0.9 to 2 TeV1.
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Copyright/License Preprint: © 2024-2025 CERN (License: CC-BY-4.0)
Submitted by tatjana.lenz@cern.ch



 


 Registro creado el 2024-11-25, última modificación el 2024-12-18


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