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Search for short- and long-lived axion-like particles in Formula omitted decays with the ATLAS experiment at the LHC
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Search for short- and long-lived axion-like particles in Formula omitted decays with the ATLAS experiment at the LHC
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Journal Article
Search for short- and long-lived axion-like particles in Formula omitted decays with the ATLAS experiment at the LHC
2024
Overview
Presented is the search for anomalous Higgs boson decays into two axion-like particles (ALPs) using the full Run 2 data set of [Formula omitted] of proton-proton collisions at a centre-of-mass energy of [Formula omitted] recorded by the ATLAS experiment. The ALPs are assumed to decay into two photons, providing sensitivity to recently proposed models that could explain the [Formula omitted] discrepancy. This analysis covers an ALP mass range from 100 to [Formula omitted] and ALP-photon couplings in the range [Formula omitted], and therefore includes signatures with significantly displaced vertices and highly collinear photons. No significant excess of events above the Standard Model background is observed. Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to two ALPs in the four-photon final state, and are in the range of [Formula omitted] to [Formula omitted], depending on the hypothesized ALP mass and ALP-photon coupling strength.
Publisher
Springer
Subject
