{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.144534.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2731621"}},{"@id":"https://doi.org/10.1140/epjc/s10052-024-12979-0","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2024","description":"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 $(g-2)_{\\mu}$ discrepancy. This analysis covers an ALP mass range from $100\\,\\text{MeV}$ to $62\\,\\text{GeV}$ and ALP-photon couplings in the range $10^{-5}\\,\\text{TeV}^{-1}<C_{a\\gamma\\gamma}/\\Lambda<1 \\,\\text{TeV}^{-1}$, 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 $ 10^{-5}$ to $3\\times 10^{-2}$, depending on the hypothesized ALP mass and ALP-photon coupling strength.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.144534.v1/t1","@type":"Dataset","description":"Cut-flow and number of events in a region with $110 \\text{ GeV} <m_{aa}<130 \\text{ GeV}$ for selected signal samples","name":"Signal cut-flow"},{"@id":"https://doi.org/10.17182/hepdata.144534.v1/t2","@type":"Dataset","description":"Overview of relative systematic uncertainties on the signal normalization for selected couplings and mass points in the dominant categories. All...","name":"Systematic uncertainties"},{"@id":"https://doi.org/10.17182/hepdata.144534.v1/t3","@type":"Dataset","description":"Upper limits on $\\mathcal{B}(H\\rightarrow aa\\rightarrow 4\\gamma)$ at 95% CL as a function of the axion mass and for ALP-photon coupling...","name":"Exclusion limits for $C_{a\\gamma\\gamma}=1$"},{"@id":"https://doi.org/10.17182/hepdata.144534.v1/t4","@type":"Dataset","description":"Upper limits on $\\mathcal{B}(H\\rightarrow aa\\rightarrow 4\\gamma)$ at 95% CL as a function of the axion mass and for ALP-photon coupling...","name":"Exclusion limits for $C_{a\\gamma\\gamma}=0.01$"},{"@id":"https://doi.org/10.17182/hepdata.144534.v1/t5","@type":"Dataset","description":"Upper limits on $\\mathcal{B}(H\\rightarrow aa\\rightarrow 4\\gamma)$ at 95% CL as a function of the axion mass and for ALP-photon coupling...","name":"Exclusion limits for $C_{a\\gamma\\gamma}=5\\times10^{-4}$"},{"@id":"https://doi.org/10.17182/hepdata.144534.v1/t6","@type":"Dataset","description":"Upper limits on $\\mathcal{B}(H\\rightarrow aa\\rightarrow 4\\gamma)$ at 95% CL as a function of the axion mass and for ALP-photon coupling...","name":"Exclusion limits for $C_{a\\gamma\\gamma}=10^{-5}$"},{"@id":"https://doi.org/10.17182/hepdata.144534.v1/t7","@type":"Dataset","description":"Upper limits on $B(H\\rightarrow 4\\gamma)$ at 95% CL as a function of the signal mass hypothesis and for the assumption...","name":"Exclusion limits for prompt analysis"},{"@id":"https://doi.org/10.17182/hepdata.144534.v1/t8","@type":"Dataset","description":"Identification efficiency for isolated photons that pass the tight photon ID requirements in dependence of the opening angle in $\\Delta...","name":"Tight efficiency"},{"@id":"https://doi.org/10.17182/hepdata.144534.v1/t9","@type":"Dataset","description":"Efficiency for classified merged isolated photons in dependence of the opening angle in $\\Delta R$ of both decay photons of...","name":"Merged efficiency"},{"@id":"https://doi.org/10.17182/hepdata.144534.v1/t10","@type":"Dataset","description":"Limits on the ALP mass and coupling to photons at 95\\%~CL, assuming $\\mathcal{B}(a\\rightarrow\\gamma\\gamma) = 1$, $\\Lambda = 1\\,TeV$ with $|C_{aH}^{\\text{eff}}|$...","name":"2D exclusion limits"},{"@id":"https://doi.org/10.17182/hepdata.144534.v1/t11","@type":"Dataset","description":"The number of data and estimated background events in the signal region of the most sensitive categories..","name":"Data background comparison"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2731621?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/144534"}],"inLanguage":"en","name":"Search for short- and long-lived axion-like particles in $H\\rightarrow a a \\rightarrow 4\\gamma$ decays with the ATLAS experiment at the LHC","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2731621?version=1","version":1}