{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.153519.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2807459"}},{"@id":"https://doi.org/10.1140/epjc/s10052-025-13916-5","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2025","description":"A search for a dark photon, a new light neutral particle, which decays promptly into collimated pairs of electrons or muons is presented. The search targets dark photons resulting from the exotic decay of the Standard Model Higgs boson, assuming its production via the dominant gluon-gluon fusion mode. The analysis is based on 140 fb -1 of data collected with the ATLAS detector at the Large Hadron Collider from proton-proton collisions at a center-of-mass energy of 13 TeV. Events with collimated pairs of electrons or muons are analysed and background contributions are estimated using data-driven techniques. No significant excess in the data above the Standard Model background is observed. Upper limits are set at 95% confidence level on the branching ratio of the Higgs boson decay into dark photons between 0.001% and 5%, depending on the assumed dark photon mass and signal model.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t1","@type":"Dataset","description":"Simulated distributions of the number of μLJ candidates for a selection of γd mass values. The shape and normalisation of...","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t2","@type":"Dataset","description":"The background-only fit (with its components) of the μLJ mass distributions for the μLJ–μLJ region, where both the μLJs are...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t3","@type":"Dataset","description":"The background-only fit (with its components) of the μLJ mass distributions for the eLJ–μLJ region. A signal distribution for a...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t4","@type":"Dataset","description":"95% CL expected and observed exclusion limits on the branching ratio of the Higgs boson to dark photons as a...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t5","@type":"Dataset","description":"95% CL expected and observed exclusion limits on the branching ratio of the Higgs boson to dark photons as a...","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t6","@type":"Dataset","description":"90% CL exclusion limit contours on the branching ratio of the Higgs boson to dark photons as functions of the...","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t7","@type":"Dataset","description":"90% CL exclusion limit contours on the branching ratio of the Higgs boson to dark photons as functions of the...","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t8","@type":"Dataset","description":"The reconstruction efficiency for μLJ objects produced in the decay of a γd into a muon pair. The reconstruction efficiency...","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t9","@type":"Dataset","description":"The reconstruction efficiency for μLJ objects produced in the decay of a γd into a muon pair. The reconstruction efficiency...","name":"Table 9"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t10","@type":"Dataset","description":"The reconstruction efficiency for μLJ objects produced in the decay of a γd into a muon pair. The reconstruction efficiency...","name":"Table 10"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t11","@type":"Dataset","description":"The reconstruction efficiency for μLJ objects produced in the decay of a γd into a muon pair. The reconstruction efficiency...","name":"Table 11"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t12","@type":"Dataset","description":"The reconstruction efficiency for μLJ objects produced in the decay of a γd into a muon pair. The reconstruction efficiency...","name":"Table 12"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t13","@type":"Dataset","description":"The reconstruction efficiency for μLJ objects produced in the decay of a γd into a muon pair. The reconstruction efficiency...","name":"Table 13"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t14","@type":"Dataset","description":"The reconstruction efficiency for eLJ objects produced in the decay of a γd into an electron pair. The reconstruction efficiency...","name":"Table 14"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t15","@type":"Dataset","description":"The reconstruction efficiency for eLJ objects produced in the decay of a γd into an electron pair. The reconstruction efficiency...","name":"Table 15"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t16","@type":"Dataset","description":"The reconstruction efficiency for eLJ objects produced in the decay of a γd into a pair of electrons. The reconstruction...","name":"Table 16"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t17","@type":"Dataset","description":"The reconstruction efficiency for eLJ objects produced in the decay of a γd into a pair of electrons. The reconstruction...","name":"Table 17"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t18","@type":"Dataset","description":"The reconstruction efficiency for eLJ objects produced in the decay of a γd into a pair of electrons. The reconstruction...","name":"Table 18"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t19","@type":"Dataset","description":"The reconstruction efficiency for eLJ objects produced in the decay of a γd into a pair of electrons. The reconstruction...","name":"Table 19"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t20","@type":"Dataset","description":"95% CL expected and observed exclusion limits on the branching ratio of the Higgs boson to dark photons as a...","name":"Table 20"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t21","@type":"Dataset","description":"95% CL expected and observed exclusion limits on the branching ratio of the Higgs boson to dark photons as a...","name":"Table 21"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t22","@type":"Dataset","description":"95% CL expected and observed exclusion limits on the branching ratio of the Higgs boson to dark photons as a...","name":"Table 22"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t23","@type":"Dataset","description":"95% CL expected and observed exclusion limits on the branching ratio of the Higgs boson to dark photons as a...","name":"Table 23"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t24","@type":"Dataset","description":"Acceptance times efficiencies (A×ϵ) as a function of the γd mass for the HAHM process for the three signal regions...","name":"Table 24"},{"@id":"https://doi.org/10.17182/hepdata.153519.v1/t25","@type":"Dataset","description":"Acceptance times efficiencies (A×ϵ) as a function of the γd mass for the FRVZ process for the three signal regions...","name":"Table 25"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2807459?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/153519"}],"inLanguage":"en","name":"Search for light neutral particles decaying promptly into collimated pairs of electrons or muons in $pp$ collisions at $\\sqrt{s}$ = 13 TeV with the ATLAS detector","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2807459?version=1","version":1}