{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.94383.v2","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1797642"}},{"@id":"https://doi.org/10.1103/PhysRevD.102.112006","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2021","description":"CERN-LHC, ATLAS. This paper describes a search for beyond the Standard Model decays of the Higgs boson into a pair of new spin-0 particles subsequently decaying into $b$-quark pairs, $H \\rightarrow aa \\rightarrow (b\\bar{b})(b\\bar{b})$, using proton--proton collision data collected by the ATLAS detector at the Large Hadron Collider at center-of-mass energy $\\sqrt{s}=13$ TeV. This search focuses on the regime where the decay products are collimated and in the range $15 \\leq m_a \\leq 30$ GeV and is complementary                                                                                                                                                   to a previous search in the same final state targeting the regime where the decay products are well separated and in the range $20 \\leq m_a \\leq 60$ GeV. A novel strategy for the identification of the $a \\rightarrow b\\bar{b}$ decays is deployed to enhance the efficiency for topologies with small separation angles. The search is performed with 36 fb$^{-1}$ of integrated luminosity collected in 2015 and 2016 and sets upper limits on the production cross-section of $H \\rightarrow aa \\rightarrow (b\\bar{b})(b\\bar{b})$, where $a$ is either a scalar or pseudoscalar particle and the Higgs boson is produced in association with a $Z$ boson.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.94383.v2/t1","@type":"Dataset","description":"Summary of the 95% CL upper limits on $\\sigma_{ZH} BR(H\\rightarrow aa \\rightarrow (b\\bar{b})(b\\bar{b}))$. Both observed and expected limits are listed....","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.94383.v2/t2","@type":"Dataset","description":"Summary of the 95% C.L. upper limits on $\\sigma_{ZH} BR(H\\rightarrow aa \\rightarrow (b\\bar{b})(b\\bar{b}))$ for the dilepton channel in the resolved...","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.94383.v2/t3","@type":"Dataset","description":"Efficiency and acceptance for simulated $ZH(\\rightarrow aa\\rightarrow (b\\bar{b})(b\\bar{b}))$ samples in two signal regions (SR) of the analysis, one with two...","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.94383.v2/t4","@type":"Dataset","description":"Event yields for a simulated $ZH(\\rightarrow aa\\rightarrow (b\\bar{b})(b\\bar{b}))$ sample with $m_a = 17.5\\,\\text{GeV}$. The signal sample is produced with cross...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.94383.v2/t5","@type":"Dataset","description":"Background yield table for Z+jets, $t\\bar{t}$, and rare sources. Observed data yield. Signal $ZH(\\rightarrow aa\\rightarrow (b\\bar{b})(b\\bar{b}))$ yield with $m_a =...","name":"Table 5"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1797642?version=2"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/94383"}],"inLanguage":"en","name":"Search for Higgs boson decays into two new low-mass spin-0 particles in the 4$b$ channel with the ATLAS detector using $pp$ collisions at $\\sqrt{s}= 13$ TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1797642?version=2","version":2}