A search for anomalous Higgs boson decays into two axion-like particles (ALPs) using the full Run~2 data set recorded by the ATLAS experiment is presented. The ALPs are assumed to decay into two photons, providing sensitivity to recently proposed models that could explain the discrepancy. This analysis covers an ALP mass range from to and ALP-photon couplings in the range , 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 to , depending on the hypothesized ALP mass and ALP-photon coupling strength.
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Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC. HEPData (collection).
https://doi.org/10.17182/hepdata.144534
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ATLAS
Collaboration
(2024).
Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC (Version 1). HEPData (collection).
https://doi.org/10.17182/hepdata.144534.v1
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ATLAS
Collaboration
(2024).
“Signal cut-flow” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.144534.v1/t1
ATLAS
Collaboration
(2024).
“Systematic uncertainties” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.144534.v1/t2
ATLAS
Collaboration
(2024).
“Exclusion limits for ” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.144534.v1/t3
ATLAS
Collaboration
(2024).
“Exclusion limits for ” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.144534.v1/t4
ATLAS
Collaboration
(2024).
“Exclusion limits for ” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.144534.v1/t5
ATLAS
Collaboration
(2024).
“Exclusion limits for ” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.144534.v1/t6
ATLAS
Collaboration
(2024).
“Exclusion limits for prompt analysis” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.144534.v1/t7
ATLAS
Collaboration
(2024).
“Tight efficiency” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.144534.v1/t8
ATLAS
Collaboration
(2024).
“Merged efficiency” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.144534.v1/t9
ATLAS
Collaboration
(2024).
“2D exclusion limits” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.144534.v1/t10
ATLAS
Collaboration
(2024).
“Data background comparison” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.144534.v1/t11
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ATLAS
Collaboration
(2024).
“LH_jsons.tar.gz” of “Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC” (Version 1). HEPData (other).
https://doi.org/10.17182/hepdata.144534.v1/r1
When using this data, please cite the original publication:
ATLAS
Collaboration
(2024).
Search for short- and long-lived axion-like particles in decays with the ATLAS experiment at the LHC. Eur.Phys.J.C 84 (2024) 742.
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