{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.159276.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/3086288"}},{"@id":"https://doi.org/10.1103/r53x-8fqp","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2025","description":"A search for pairs of light neutral pseudoscalar bosons ($ A$) resulting from the decay of a Higgs boson is performed. The search is conducted using LHC proton-proton collision data at $\\sqrt{s} = 13~\\mathrm{TeV}$, collected with the CMS detector in 2016--2018 and corresponding to an integrated luminosity of $138~\\mathrm{fb}^{-1}$. The $ A$ boson decays into a highly collimated electron-positron pair. A novel multivariate algorithm using tracks and calorimeter information is developed to identify these distinctive signatures, and events are selected with two such merged electron-positron pairs. No significant excess above the standard model background predictions is observed. Upper limits on the branching fraction for $ H\\to A A\\to4 e$ are set at $95\\%$ confidence level, for masses between 10 and 100 MeV and proper decay lengths below 100 $\\mu\\mathrm{m}$ ;  reaching branching fraction sensitivities as low as $10^{-5}$. This is the first search for Higgs boson decays to four electrons via light pseudoscalars at the LHC. It significantly improves the experimental sensitivity to axion-like particles with masses below 100 MeV.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.159276.v1/t1","@type":"Dataset","description":"Invariant mass distribution of the four-electron system ($m_{4 e}$) for selected events (points), compared to the background-only fit (red) with...","name":"Figure 1"},{"@id":"https://doi.org/10.17182/hepdata.159276.v1/t2","@type":"Dataset","description":"Observed (solid points) and expected (dashed lines) $95\\%$ CL upper limits on the Higgs boson branching fraction to a pair...","name":"Figure 2"},{"@id":"https://doi.org/10.17182/hepdata.159276.v1/t3","@type":"Dataset","description":"A map of the observed $95\\%$ CL upper limit on the Higgs boson branching fraction for $ H \\to A...","name":"Figure 3"},{"@id":"https://doi.org/10.17182/hepdata.159276.v1/t4","@type":"Dataset","description":"Selection efficiencies for the barrel region at object level. 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Definitions used in this table: Track-Match efficiency (barrel / endcap) is...","name":"Additional Table 3 (2017 Barrel object level Cutflow)"},{"@id":"https://doi.org/10.17182/hepdata.159276.v1/t11","@type":"Dataset","description":"Selection efficiencies for the endcap region at object level. Definitions as above.","name":"Additional Table 3 (2017 Endcap object level Cutflow)"},{"@id":"https://doi.org/10.17182/hepdata.159276.v1/t12","@type":"Dataset","description":"Trigger-level and overall event-level efficiency.Definitions used in this table: Trigger efficiency is defined as the number of events passing both...","name":"Additional Table 3 (2017 event level Cutflow)"},{"@id":"https://doi.org/10.17182/hepdata.159276.v1/t13","@type":"Dataset","description":"Selection efficiencies for the barrel region at object level. Definitions used in this table: Track-Match efficiency (barrel / endcap) is...","name":"Additional Table 4 (2018 Barrel object level Cutflow)"},{"@id":"https://doi.org/10.17182/hepdata.159276.v1/t14","@type":"Dataset","description":"Selection efficiencies for the endcap region at object level. Definitions as above.","name":"Additional Table 4 (2018 Endcap object level Cutflow)"},{"@id":"https://doi.org/10.17182/hepdata.159276.v1/t15","@type":"Dataset","description":"Trigger-level and overall event-level efficiency.Definitions used in this table: Trigger efficiency is defined as the number of events passing both...","name":"Additional Table 4 (2018 event level Cutflow)"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins3086288?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/159276"}],"inLanguage":"en","name":"Search for light pseudoscalar bosons, pair-produced in Higgs boson decays in the four-electron final state in proton-proton collisions at $\\sqrt{s}$ = 13 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins3086288?version=1","version":1}