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A search for decays of the Higgs boson into a pair of new spin-zeroparticles, $H \to aa$, where the $a$-bosons decay into a $b$-quark pair andmuon pair, is presented. The search uses 36.1 fb$^{-1}$ of proton-protoncollision data at $\sqrt{s}=13$ TeV recorded by the ATLAS experiment at the LHCin 2015 and 2016. No significant deviation from the Standard Model predictionis observed. Upper limits at 95% confidence level are placed on the branchingratio $(\sigma_H / \sigma_{SM}) \times B(H\to aa\to bb\mu\mu)$, ranging from$2\times 10^{-4}$ to $10^{-3}$ in the $a$-boson mass range of 20-60 GeV.Model-independent limits are set on the visible production cross-section timesthe branching ratio to the $bb\mu\mu$ final state for new physics,$\sigma_{vis}(X) \times B(X\to bb\mu\mu)$, ranging from 0.1 fb to 0.73 fb for$m_{\mu\mu}$ between 18 and 62 GeV.

physics letters b

Search for Higgs boson decays into a pair of light bosons in the  $bb\mu\mu$ final state in $pp$ collision at $\sqrt{s} = $13 TeV with the  ATLAS detector