PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T10 Searches for New Physics
Searching for anomalous Higgs boson decays into two axions in four photon final states with the ATLAS detector
P. Kramer*, O. Vujinović  on behalf of the ATLAS Collaboration
Full text: pdf
Pre-published on: January 31, 2024
Published on: March 21, 2024
A dedicated search for anomalous Higgs boson decays into two axion-like-particles (ALPs) is presented, using the full Run-2 data-set recorded by the ATLAS experiment. The ALPs are assumed to decay into two photons, providing sensitivity to various recently proposed models that could explain the famous g-2 discrepancy. This poster presents details of the search in the mass range of ALPs between 100 MeV and 5 GeV the signature includes highly collinear photons. A dedicated identification of collinear photons was developed and is presented along with the upper limits placed on the branching ratio of the Higgs boson to the the four photon final state.
DOI: https://doi.org/10.22323/1.449.0480
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