{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.131523.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2100410"}},{"@id":"https://doi.org/10.1007/JHEP06(2023)153","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2023","description":"A search for light long-lived neutral particles with masses in the O(MeV-GeV) range is presented. The analysis targets the production of long-lived dark photons in the decay of a Higgs boson produced via gluon-gluon fusion or in association with a W boson. Events that contain displaced collimated Standard Model fermions reconstructed in the calorimeter or muon spectrometer are selected in 139 fb-1 of 13 TeV pp collision data collected by the ATLAS detector at the LHC.\n\nBackground estimates for contributions from Standard Model processes and instrumental effects are extracted from data. The observed event yields are consistent with the expected background. Exclusion limits are reported on the production cross-section times branching fraction as a function of the mean proper decay length c\u03c4 of the dark photon, or as a function of the dark-photon mass and kinetic mixing parameter that quantifies the coupling between the Standard Model and potential hidden (dark) sectors. A Higgs boson branching fraction above 1% is excluded at 95% CL for a Higgs boson decaying into two dark photons for dark-photon mean proper decay lengths between 10 mm and 250 mm and dark photons with masses between 0.4 GeV and 2 GeV.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t1","@type":"Dataset","description":"The reconstruction efficiency for μDPJ objects satisfying the cosmic-ray tagger selection produced in the decay of a γd into a...","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t2","@type":"Dataset","description":"The reconstruction efficiency for μDPJ objects satisfying the cosmic-ray tagger selection produced in the decay of a γd into a...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t3","@type":"Dataset","description":"The reconstruction efficiency for caloDPJs produced by the decay of γd into e+e- or qq̄. The reconstruction efficiency is shown...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t4","@type":"Dataset","description":"The reconstruction efficiency for caloDPJs produced by the decay of γd into e+e- or qq̄. The reconstruction efficiency is shown...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t5","@type":"Dataset","description":"Observed 95% CL upper limits on the branching ratio (B) for the decay H→ 2γd+X and ggF selection, for different γd...","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t6","@type":"Dataset","description":"Observed 95% CL upper limits on the branching ratio (B) for the decay H→ 2γd+X and ggF selection, for different γd...","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t7","@type":"Dataset","description":"Observed 95% CL upper limits on the branching ratio (B) for the decay H→ 2γd+X and ggF selection, for different γd...","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t8","@type":"Dataset","description":"Observed 95% CL upper limits on the branching ratio (B) for the decay H→ 2γd+X and WH selection, for different γd...","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t9","@type":"Dataset","description":"Observed 95% CL upper limits on the branching ratio (B) for the decay H→ 2γd+X and WH selection, for different γd...","name":"Table 9"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t10","@type":"Dataset","description":"Observed 95% CL upper limits on the branching ratio (B) for the decay H→ 2γd+X and WH selection, for different γd...","name":"Table 10"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t11","@type":"Dataset","description":"Observed 95% CL upper limits on the branching ratio (B) for the decay H→ 2γd and ggF selection, for different γd...","name":"Table 11"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t12","@type":"Dataset","description":"Observed 95% CL upper limits on the branching ratio (B) for the decay H→ 2γd and ggF selection, for different γd...","name":"Table 12"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t13","@type":"Dataset","description":"Observed 95% CL upper limits on the branching ratio (B) for the decay H→ 2γd and ggF selection, for different γd...","name":"Table 13"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t14","@type":"Dataset","description":"The CalRatio 2015--2016 trigger efficiency for the decay of γd in e+e- or qq̄. The trigger efficiency is shown for...","name":"Table 14"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t15","@type":"Dataset","description":"The CalRatio 2015--2016 trigger efficiency for the decay of γd in e+e- or qq̄. The trigger efficiency is shown for...","name":"Table 15"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t16","@type":"Dataset","description":"The CalRatio 2017--2018 trigger efficiency for the decay of γd in e+e- or qq̄. The trigger efficiency is shown for...","name":"Table 16"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t17","@type":"Dataset","description":"The CalRatio 2017--2018 trigger efficiency for the decay of γd in e+e- or qq̄. The trigger efficiency is shown for...","name":"Table 17"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t18","@type":"Dataset","description":"The narrow-scan 2015--2016 trigger efficiency for the decay of γd in μ+μ-. The trigger efficiency is shown for γd with...","name":"Table 18"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t19","@type":"Dataset","description":"The narrow-scan 2015--2016 trigger efficiency for the decay of γd in μ+μ-. The trigger efficiency is shown for γd with...","name":"Table 19"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t20","@type":"Dataset","description":"The narrow-scan 2017--2018 trigger efficiency for the decay of γd in μ+μ-. The trigger efficiency is shown for γd with...","name":"Table 20"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t21","@type":"Dataset","description":"The narrow-scan 2017--2018 trigger efficiency for the decay of γd in μ+μ-. The trigger efficiency is shown for γd with...","name":"Table 21"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t22","@type":"Dataset","description":"Efficiency of the cosmic-ray tagger as function of the γd transverse decay length. The efficiency is calculated accepting the μDPJs...","name":"Table 22"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t23","@type":"Dataset","description":"Efficiency of the cosmic-ray tagger as function of the γd transverse momentum. The efficiency is calculated accepting the μDPJs for...","name":"Table 23"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t24","@type":"Dataset","description":"Efficiency of the QCD tagger as function of the γd transverse decay length. The efficiency is calculated accepting the caloDPJs...","name":"Table 24"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t25","@type":"Dataset","description":"Efficiency of the QCD tagger as function of the γd transverse momentum. The efficiency is calculated accepting the caloDPJs for...","name":"Table 25"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t26","@type":"Dataset","description":"The extrapolated acceptance times efficiencies as a function of the γd mean proper lifetime cτ for the FRVZ pp →...","name":"Table 26"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t27","@type":"Dataset","description":"The extrapolated acceptance times efficiencies as a function of the γd mean proper lifetime cτ for the FRVZ pp →...","name":"Table 27"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t28","@type":"Dataset","description":"The extrapolated acceptance times efficiencies as a function of the γd mean proper lifetime cτ for the FRVZ pp →...","name":"Table 28"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t29","@type":"Dataset","description":"The extrapolated acceptance times efficiencies as a function of the γd mean proper lifetime cτ for the FRVZ pp →...","name":"Table 29"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t30","@type":"Dataset","description":"The extrapolated acceptance times efficiencies as a function of the γd mean proper lifetime cτ for the FRVZ pp →...","name":"Table 30"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t31","@type":"Dataset","description":"The extrapolated acceptance times efficiencies as a function of the γd mean proper lifetime cτ for the FRVZ pp →...","name":"Table 31"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t32","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SR2μggF, as a function of the γd mean proper lifetime cτ for the FRVZ...","name":"Table 32"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t33","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SRc+μggF, as a function of the γd mean proper lifetime cτ for the FRVZ...","name":"Table 33"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t34","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SR2c;ggF, as a function of the γd mean proper lifetime cτ for the FRVZ...","name":"Table 34"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t35","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SR2μggF, as a function of the γd mean proper lifetime cτ for the HAHM...","name":"Table 35"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t36","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SRc+μggF, as a function of the γd mean proper lifetime cτ for the HAHM...","name":"Table 36"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t37","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SR2c;ggF, as a function of the γd mean proper lifetime cτ for the HAHM...","name":"Table 37"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t38","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SR2μggF, as a function of the γd mean proper lifetime cτ for the FRVZ...","name":"Table 38"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t39","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SRc+μggF, as a function of the γd mean proper lifetime cτ for the FRVZ...","name":"Table 39"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t40","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SR2c;ggF, as a function of the γd mean proper lifetime cτ for the FRVZ...","name":"Table 40"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t41","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SR2μggF, as a function of the γd mean proper lifetime cτ for the FRVZ...","name":"Table 41"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t42","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SRc+μggF, as a function of the γd mean proper lifetime cτ for the FRVZ...","name":"Table 42"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t43","@type":"Dataset","description":"The extrapolated acceptance times efficiencies for SR2c;ggF, as a function of the γd mean proper lifetime cτ for the FRVZ...","name":"Table 43"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t44","@type":"Dataset","description":"Observed limits at the 95% CL on the branching ratio (B), obtained from the SR2μggF, for the process pp →...","name":"Table 44"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t45","@type":"Dataset","description":"Observed limits at the 95% CL on the branching ratio (B), obtained from the SRc+μggF, for the process pp →...","name":"Table 45"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t46","@type":"Dataset","description":"Observed limits at the 95% CL on the branching ratio (B), obtained from the SR2cggF, for the process pp →...","name":"Table 46"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t47","@type":"Dataset","description":"Observed limits at the 95% CL on the cross section, obtained from the SR2μggF, for the process pp → H→ 2γd+X,...","name":"Table 47"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t48","@type":"Dataset","description":"Observed limits at the 95% CL on the cross section, obtained from the SRc+μggF, for the process pp → H→ 2γd+X,...","name":"Table 48"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t49","@type":"Dataset","description":"Observed limits at the 95% CL on the cross section, obtained from the SR2cggF, for the process pp → H→ 2γd+X...","name":"Table 49"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t50","@type":"Dataset","description":"Observed limits at the 95% CL on the cross section for the process pp → H→ 4γd+X and ggF selection, for...","name":"Table 50"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t51","@type":"Dataset","description":"Observed limits at the 95% CL on the cross section for the process pp → H→ 4γd+X and ggF selection, for...","name":"Table 51"},{"@id":"https://doi.org/10.17182/hepdata.131523.v1/t52","@type":"Dataset","description":"Observed limits at the 95% CL on the cross section for the process pp → H→ 4γd+X and ggF selection, for...","name":"Table 52"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2100410?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/131523"}],"inLanguage":"en","name":"Search for light long-lived neutral particles that decay to collimated pairs of leptons or light hadrons 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/ins2100410?version=1","version":1}