Abstract
This paper presents a dedicated search for exotic decays of the Higgs boson to a pair of new spin-zero particles, H rightarrow aa, where the particle a decays to b-quarks and has a mass in the range of 20–60 GeV. The search is performed in events where the Higgs boson is produced in association with a W boson, giving rise to a signature of a lepton (electron or muon), missing transverse momentum, and multiple jets from b-quark decays. The analysis is based on the full dataset of pp collisions at sqrt{s} = 13,mathrm{{TeV}} recorded in 2015 by the ATLAS detector at the CERN Large Hadron Collider, corresponding to an integrated luminosity of 3.2 text{ fb }^{-1}. No significant excess of events above the Standard Model prediction is observed, and a 95,% confidence-level upper limit is derived for the product of the production cross section for pp rightarrow WH times the branching ratio for the decay H rightarrow aa rightarrow 4b. The upper limit ranges from 6.2 pb for an a-boson mass m_a = 20,mathrm{{GeV}} to 1.5 pb for m_a = 60,mathrm{{GeV}}.
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