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Article
Report number arXiv:2304.12885 ; CERN-EP-2023-044
Title Search in diphoton and dielectron final states for displaced production of Higgs or Z bosons with the ATLAS detector in s=13 TeV pp collisions
Author(s) ATLAS Collaboration  Show all 2973 authors
Corporate Author(s) ATLAS Collaboration
Publication 2023-07-01
Imprint 25 Apr 2023
Number of pages 32
Note All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2020-28/
In: Phys. Rev. D 108 (2023) 012012
DOI 10.1103/PhysRevD.108.012012 (publication)
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords exotics ; experimental results ; displaced Higgs/Z
Abstract A search is presented for displaced production of Higgs bosons or Z bosons, originating from the decay of a neutral long-lived particle (LLP) and reconstructed in the decay modes Hγγ and Zee. The analysis uses the full Run 2 data set of proton-proton collisions delivered by the LHC at an energy of s=13 TeV between 2015 and 2018 and recorded by the ATLAS detector, corresponding to an integrated luminosity of 139 fb1. Exploiting the capabilities of the ATLAS liquid argon calorimeter to precisely measure the arrival times and trajectories of electromagnetic objects, the analysis searches for the signature of pairs of photons or electrons which arise from a common displaced vertex and which arrive after some delay at the calorimeter. The results are interpreted in a gauge-mediated supersymmetry breaking model with pair-produced higgsinos that decay to LLPs, and each LLP subsequently decays into either a Higgs boson or a Z boson. The final state includes at least two particles that escape direct detection, giving rise to missing transverse momentum. No significant excess is observed above the background expectation. The results are used to set upper limits on the cross section for higgsino pair production, up to a ˜χ01 mass of 369 (704) GeV for decays with 100\% branching ratio of ˜χ01 to Higgs (Z) bosons for a ˜χ01 lifetime of 2 ns. A model-independent limit is also set on the production of pairs of photons or electrons with a significant delay in arrival at the calorimeter.
Related document supersedes: ATLAS-CONF-2022-051
Copyright/License Publication: © 2023-2025 CERN (License: CC BY 4.0), sponsored by SCOAP³
Preprint: © 2023-2025 CERN (License: CC-BY-4.0)



Corresponding record in: Inspire
Email contact: tatjana.lenz@cern.ch


 Záznam vytvorený 2023-04-25, zmenený 2024-12-25


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