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Abstract (data abstract)

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.

Table 1

Data from figure 10.

10.17182/hepdata.94383.v2/t1

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....
https://www.hepdata.net/record/data/814176yaml https://www.hepdata.net/record/data/814176/csvcsv
Table 2

Data from figure 9b (HIGG-2017-05).

10.17182/hepdata.94383.v2/t2

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...
https://www.hepdata.net/record/data/814177yaml https://www.hepdata.net/record/data/814177/csvcsv
Table 3

Not available.

10.17182/hepdata.94383.v2/t3

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...
https://www.hepdata.net/record/data/814178yaml https://www.hepdata.net/record/data/814178/csvcsv
Table 4

Not available.

10.17182/hepdata.94383.v2/t4

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...
https://www.hepdata.net/record/data/814179yaml https://www.hepdata.net/record/data/814179/csvcsv
Table 5

Data from figure 9.

10.17182/hepdata.94383.v2/t5

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 =...
https://www.hepdata.net/record/data/814180yaml https://www.hepdata.net/record/data/814180/csvcsv

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